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• Using USB to Ethernet with Linux Ubuntu 12.04

  - by Sriram

  Being a newbie, Please excuse if the technical Jargon used is not an universally accepted one :) I have a particular device (say device A) whose USB2.0 driver is available from Linux community. Linux UBUNTU12.04 based PC is able to detect that device via the available driver. My requirement is to ensure that PC can exchange the command as well as data with the device A over TCP/IP packets (In other words, instead of just a USB Based driver, there should be a TCP/IP wrapper over the device USB driver and still does the same job as the USB driver was doing before) Bought an USB (Female) to RJ-45 adapter,connected Device A (male) USB to the USB Female end of the adapter and the Ethernet end connected to the router. PC also is connected to the same router so that both Device A and the PC have the IP address in the same subnet range. So the packets produced by the device A can be routed to the PC via some binding( not sure how I can achieve this, but conceptual idea) Here are the issues I can see as of now 1) USB to RJ-45 is just a hardware signal conversion and not a NIC in itself and hence no MAC/IP ADDRESS assigned. Can we bind a virtual NIC created in PC with this connector? 2) Any available USB TO IP command as well as data translation wrappers available? e.g. command for the device A on Ethernet converted to command for the device A on USB which is then acted upon the device as a command from the USB driver There is some missing link in my understanding and hence it would be of great help if you can bounce off some ideas on how I can take this forward so that Device A and PC exchange data over IP. Thanks and Regards, Sriram

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• Weird routing issue (updated)

  - by smccloud

  I just updated the route tables due to a mistake on my part. I am working on getting networking working correctly on a cluster of 14 virtual servers at a customer site. 11 of them work fine for routing and 3 don't work correctly for their administrative network (172.28.56.0). All are running Windows Web Server 2008R2. Default gateway is set on the production network (172.28.58.0) and not on the administrative network (handled with persistent static routes). On a working server, route print gives me the following (MACs redacted) =========================================================================== Interface List 11...XX XX XX XX XX XX ......Intel(R) PRO/1000 MT Network Connection 13...XX XX XX XX XX XX00 0c 29 85 b2 98 ......Intel(R) PRO/1000 MT Network Connection #2 1...........................Software Loopback Interface 1 12...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter 14...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #2 15...00 00 00 00 00 00 00 e0 Teredo Tunneling Pseudo-Interface =========================================================================== IPv4 Route Table =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 172.28.58.1 172.28.58.11 266 10.18.1.22 255.255.255.255 172.28.58.1 172.28.58.11 11 10.32.0.0 255.255.0.0 172.28.56.1 172.28.56.201 11 127.0.0.0 255.0.0.0 On-link 127.0.0.1 306 127.0.0.1 255.255.255.255 On-link 127.0.0.1 306 127.255.255.255 255.255.255.255 On-link 127.0.0.1 306 172.28.34.0 255.255.255.0 172.28.56.1 172.28.56.201 11 172.28.42.0 255.255.255.0 172.28.56.1 172.28.56.201 11 172.28.56.0 255.255.255.0 On-link 172.28.56.201 266 172.28.56.0 255.255.255.0 172.28.56.1 172.28.56.201 11 172.28.56.201 255.255.255.255 On-link 172.28.56.201 266 172.28.56.255 255.255.255.255 On-link 172.28.56.201 266 172.28.58.0 255.255.255.224 On-link 172.28.58.11 266 172.28.58.0 255.255.255.224 172.28.58.1 172.28.58.11 11 172.28.58.1 255.255.255.255 172.28.58.1 172.28.58.11 11 172.28.58.11 255.255.255.255 On-link 172.28.58.11 266 172.28.58.31 255.255.255.255 On-link 172.28.58.11 266 172.28.60.0 255.255.255.0 172.28.56.1 172.28.56.201 11 172.28.63.0 255.255.255.0 172.28.56.1 172.28.56.201 11 192.168.0.0 255.255.0.0 172.28.56.1 172.28.56.201 11 224.0.0.0 240.0.0.0 On-link 127.0.0.1 306 224.0.0.0 240.0.0.0 On-link 172.28.56.201 266 224.0.0.0 240.0.0.0 On-link 172.28.58.11 266 255.255.255.255 255.255.255.255 On-link 127.0.0.1 306 255.255.255.255 255.255.255.255 On-link 172.28.56.201 266 255.255.255.255 255.255.255.255 On-link 172.28.58.11 266 =========================================================================== Persistent Routes: Network Address Netmask Gateway Address Metric 172.28.56.0 255.255.255.0 172.28.56.1 1 172.28.63.0 255.255.255.0 172.28.56.1 1 192.168.0.0 255.255.0.0 172.28.56.1 1 172.28.60.0 255.255.255.0 172.28.56.1 1 10.32.0.0 255.255.0.0 172.28.56.1 1 172.28.34.0 255.255.255.0 172.28.56.1 1 172.28.42.0 255.255.255.0 172.28.56.1 1 0.0.0.0 0.0.0.0 172.28.58.1 Default =========================================================================== IPv6 Route Table =========================================================================== Active Routes: If Metric Network Destination Gateway 1 306 ::1/128 On-link 1 306 ff00::/8 On-link =========================================================================== Persistent Routes: None On one of the non-working server, route print gives me the following (MACs redacted) =========================================================================== Interface List 11...XX XX XX XX XX XX ......Intel(R) PRO/1000 MT Network Connection 13...XX XX XX XX XX XX ......Intel(R) PRO/1000 MT Network Connection #2 1...........................Software Loopback Interface 1 12...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter 14...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter #2 16...00 00 00 00 00 00 00 e0 Teredo Tunneling Pseudo-Interface =========================================================================== IPv4 Route Table =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 172.28.58.1 172.28.58.21 266 10.32.0.0 255.255.0.0 172.28.56.1 172.28.56.211 11 127.0.0.0 255.0.0.0 On-link 127.0.0.1 306 127.0.0.1 255.255.255.255 On-link 127.0.0.1 306 127.255.255.255 255.255.255.255 On-link 127.0.0.1 306 172.28.34.0 255.255.255.0 172.28.56.1 172.28.56.211 11 172.28.42.0 255.255.255.0 172.28.56.1 172.28.56.211 11 172.28.56.0 255.255.255.0 172.28.56.1 172.28.56.211 11 172.28.56.211 255.255.255.255 On-link 172.28.56.211 266 172.28.58.0 255.255.255.0 172.28.58.1 172.28.58.21 11 172.28.58.0 255.255.255.224 On-link 172.28.58.21 266 172.28.58.21 255.255.255.255 On-link 172.28.58.21 266 172.28.58.31 255.255.255.255 On-link 172.28.58.21 266 172.28.60.0 255.255.255.0 172.28.56.1 172.28.56.211 11 172.28.63.0 255.255.255.0 172.28.56.1 172.28.56.211 11 192.168.0.0 255.255.0.0 172.28.56.1 172.28.56.211 11 224.0.0.0 240.0.0.0 On-link 127.0.0.1 306 224.0.0.0 240.0.0.0 On-link 172.28.56.211 266 224.0.0.0 240.0.0.0 On-link 172.28.58.21 266 255.255.255.255 255.255.255.255 On-link 127.0.0.1 06 255.255.255.255 255.255.255.255 On-link 172.28.56.211 266 255.255.255.255 255.255.255.255 On-link 172.28.58.21 266 =========================================================================== Persistent Routes: Network Address Netmask Gateway Address Metric 172.28.56.0 255.255.255.0 172.28.56.1 1 172.28.60.0 255.255.255.0 172.28.56.1 1 172.28.63.0 255.255.255.0 172.28.56.1 1 172.28.34.0 255.255.255.0 172.28.56.1 1 172.28.42.0 255.255.255.0 172.28.56.1 1 192.168.0.0 255.255.0.0 172.28.56.1 1 10.32.0.0 255.255.0.0 172.28.56.1 1 0.0.0.0 0.0.0.0 172.28.58.1 Default 172.28.58.0 255.255.255.0 172.28.58.1 1 =========================================================================== IPv6 Route Table =========================================================================== Active Routes: If Metric Network Destination Gateway 1 306 ::1/128 On-link 1 306 ff00::/8 On-link =========================================================================== Persistent Routes: None I am at a complete loss why the non-working servers have no On-link route for 172.28.56.0. Does anyone have any suggestions on what I should be looking at to figure this out? Also, I do have "physical" access to the console if needed through vSphere Client.

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• SQL SERVER – BACKUPIO, BACKUPBUFFER – Wait Type – Day 14 of 28

  - by pinaldave

  Backup is the most important task for any database admin. Your data is at risk if you are not performing database backup. Honestly, I have seen many DBAs who know how to take backups but do not know how to restore it. (Sigh!) In this blog post we are going to discuss about one of my real experiences with one of my clients – BACKUPIO. When I started to deal with it, I really had no idea how to fix the issue. However, after fixing it at two places, I think I know why this is happening but at the same time, I am not sure the fix is the best solution. The reality is that the fix is not a solution but a workaround (which is not optimal, but get your things done). From Book On-Line: BACKUPIO Occurs when a backup task is waiting for data, or is waiting for a buffer in which to store data. This type is not typical, except when a task is waiting for a tape mount. BACKUPBUFFER Occurs when a backup task is waiting for data, or is waiting for a buffer in which to store data. This type is not typical, except when a task is waiting for a tape mount. BACKUPIO and BACKUPBUFFER Explanation: This wait stats will occur when you are taking the backup on the tape or any other extremely slow backup system. Reducing BACKUPIO and BACKUPBUFFER wait: In my recent consultancy, backup on tape was very slow probably because the tape system was very old. During the time when I explained this wait type reason in the consultancy, the owners immediately decided to replace the tape drive with an alternate system. They had a small SAN enclosure not being used on side, which they decided to re-purpose. After a week, I had received an email from their DBA, saying that the wait stats have reduced drastically. At another location, my client was using a third party tool (please don’t ask me the name of the tool) to take backup. This tool was compressing the backup along with taking backup. I have had a very good experience with this tool almost all the time except this one sparse experience. When I tried to take backup using the native SQL Server compressed backup, there was a very small value on this wait type and the backup was much faster. However, when I attempted with the third party backup tool, this value was very high again and was taking much more time. The third party tool had many other features but the client was not using these features. We end up using the native SQL Server Compressed backup and it worked very well. If I get to see this higher in my future consultancy, I will try to understand this wait type much more in detail and so probably I would able to come to some solid solution. Read all the post in the Wait Types and Queue series. Note: The information presented here is from my experience and there is no way that I claim it to be accurate. I suggest reading Book OnLine for further clarification. All the discussion of Wait Stats in this blog is generic and varies from system to system. It is recommended that you test this on a development server before implementing it to a production server. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, SQL Wait Stats, SQL Wait Types, T SQL, Technology

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• Asterisk: Forcing a sip peer to connect via ipv6?

  - by growse

  I've got an asterisk server that connects to an upstream provider over a WAN. The upstream provider supports both IPv4 and IPv6 connectivity, and the asterisk server is behind a NAT. When asterisk connects to the upstream sip peer via IPv6, everything works perfectly. The issue I have is that when I configure the asterisk server IPv6 address via DHCPv6, a race condition means that asterisk sometimes ends up attempting to contact the upstream peer via IPv4 (the SIP DNS name has both A and AAAA records). This is because asterisk starts up before the system has a valid IPv6 address. The connection does not work via IPv4 because of the NAT. Is there a way of configuring the peer to specify that it should only be contactable over IPv6? I guess it might be possible to hack together a firewall rule to deny all IPv4 traffic to that IP, but it'd be easier to configure this within asterisk itself.

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• Why does changing the physical socket on your router cause delays?

  - by Josh Browning

  My question involves the delays involved with changing which physical socket your ethernet cable is connected to. I am aware that if you are connected to a router on a network and then change which physical socket on that router you are using you will gain very small additional delays initially. However I am curious as to what causes these delays. I originally thought it was to do with the infromation stored in the routing table and whether that was allocated to a specific socket on the router or not. Although, if your IP address is the same then I don't understand why there would be delays because I would of assumed that any information within the router was linked to an IP address rather than a physical socket.

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• Unable to access Citrix XenApp 6 published applications externally

  - by Christopher McCann

  We are trying to use a trial of Citrix XenApp 6 Fundamentals to virtualise a couple of applications as a proof of concept. We haven't ever used it before so I confess to be a noob with it. We can connect to the XenApp web interface, and the iPad app will connect and list the applications, but the applications themselves will not load. I discovered in the .ica file that it was attempting to connect to the internal IP address of the server instead of its static external. I have been following various threads on Citrix but nothing seems to have fixed it for me. The server is deployed on an EC2 instance with a static elastic IP. All the ports are opened and I can telnet into the XenApp server on 1493 and I get the ICA response. I have also run on ALTADDR and provided the external IP address. Does anyone have any ideas?

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• Recommendations for managing DNS issues when hosting customer sites.

  - by Thomas

  I'm working at a company which primarily provides SaaS products but also will host some of our customers corporate websites. My question relates to recommendations for managing DNS for client's domain names. My objectives: Not restrict my ability to change the server's IP address such as might happen when I move my servers to a new host. Not have to contact the customer to change their domain's DNS if I need to change the server's IP address. Often times, customers lose this information or have to track down the one person with any knowledge of the domain settings. Map both .clientdomain.com and www.clientdomain.com to the proper IIS site. However, I'm running into a couple of common problems: Sometimes, the DNS console provided by the client's hosting company does not allow for CNAME records. Sometimes, the DNS console provided by the client's hosting company will not let me create a CNAME entry for .spiffydomain.com because the given hosting company has created a SOA record for that entry or simply requires that .spiffydomain.com be an A record. I believe one solution to #2 is to use a wildcard for a CNAME entry (i.e. *.spiffydomain.com). Is that correct? How do other folks that are hosting many customer's site manage change of DNS entries on their servers?

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• Where did this incorrect cached DNS lookup come from?

  - by Stephen Jennings

  Somehow, I've been having a chronic issue where my computer will get an invalid DNS lookup in its cache for either of the two Exchange servers I use from Mail.app. My workplace runs one of the Exchange servers and I run the other (they are totally unrelated, hosted by different companies, etc.). The problem manifests as a certificate domain error. When it happens, I can run nslookup mail.mydomain.com and I see the incorrect IP address (usually owned by either Apple or Akamai), but if I run nslookup mail.mydomain.com 8.8.8.8, I get the correct address. My real quest is to find out why this keeps happening, and to do that, I'd like to know which server is supplying me this bad DNS entry. Is there a way to check my DNS cache to see where this bad lookup came from?

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• MySQL Workbench sends computer name with login not IP

  - by Android Addict

  I am attempting to connect MySQLWorkbench to a remote MySQL Server. The server has granted access to user@IPAddress However, when I try to connect MySQLWorkbench, it sends user@computername instead. How do I configure the connection to use the IP address instead in MySQLWorkbench? Reference: The remote server is on the local network, so I need to use the local IP address assigned to my client. EDIT What I have tried so far: from the server: mysql -u user@IPAddress -p --host=(ServerIPAddress) Returns: mysql> So that tells me the user account is operational. Furthermore, I confirmed it exists using: select user from mysql.user; returning a table of all users, of which the user I am using is present. I have also opened the port 3306: sbin/iptables -A INPUT -i eth0 -s clientIPAddress -p tcp --destination-port3306 -j ACCEPT Still I encounter Access Denied

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• Redirect email based on Source IP / Hostname

  - by PostMan

  So, we have a situation where we would like to be able to redirect (ignoring original destination) emails coming through out exchange server (locally sent) to a different email address. The situation is as follows: Testing a new server, this hosts a lot of our custom applications / scheduled tasks (as does the production version of this server). Instead of changing config files / parameters for these applications we'd rather leave them as they are, as we want to be as close to production as possible, however we don't want the emails go to the staff they would normally go to, we'd rather they were sent to a test email address where we are able to confirm the results. The emails look exactly like the production emails (same from / to / cc / bcc) except their source, hence why we'd like to know if the ability to redirect based on hostname exists. Cheers.

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• EPPM Webcast Series Part II: Build – Consistently delivering successful projects to ensure financial success

  - by Sylvie MacKenzie, PMP

  Oracle Primavera invites you to the second in a series of three webcasts linking Enterprise Project Portfolio Management with enhanced operational performance and better financial results. Join us for the next installment of our 'Plan, Build, Operate' webcast series, as we look to address the challenges organizations face during the execution phase of their projects. Webcast II: Build – Consistently delivering successful projects to ensure financial success. This webcast will look at Three key questions: How do you maintain consistency in delivery whilst maintaining visibility and control? How do you deal with project risk and mitigation strategies? How do you ensure accurate reporting? Hear from Geoff Roberts, Industry Strategist from Oracle Primavera. Geoff will look at how solutions can help to address the challenges around: Visibility and governance Communication and complex coordination Collecting and reporting progress Measuring and reporting It is imperative that organizations understand the impact projects can have on their business. Attend this webcast and understand how consistently delivering successful projects is vital to the financial success of an asset intensive organisation. Register today! Please forward this invite to your colleagues who you think may benefit from attending.

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• Google Account Changes that Messed Up My Ability to Manage Sites

  - by A Yearwood

  I hope you can help... I have a google account that I use to manage my church website. This account is set up with my work email address. My work (a school system) is in the process of changing us all over to use google accounts to replace Outlook. When I logged in to this new account (which is my same email address) it no longer lets me manage my google site. Under my dashboard I can see that my data is still there, but when I try to "manage" my site it says I don't have one and re-directs me to my school's account. Thanks in advance. A Yearwood

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• Today's Links (6/30/2011)

  - by Bob Rhubart

  James Gosling Says He Doesn't Care About Java But here's the rest of the story: "What I really care about is the Java Virtual Machine as a concept," says Gosling, "because that is the thing that ties it all together; it's the thing that makes Java the language possible; it's the thing that makes things work on all kinds of different platforms; and it makes all kinds of languages able to coexist." Virtual Developer Day: SOA Accelerate Your Development with Oracle SOA Suite. Learn how in this FREE on-line workshop with Hands-on labs July 12th 9 am to 1:30 PM PST" July 12th 9 am to 1:30 PM PST Podcast: Toronto Architect Day Panel Discussion Part 3 (of 4) is now available, in which the panel (including Oracle ACE Director Cary Millsap and InfoQ editor and co-founder Floyd Marinescu) discusses public vs private cloud as the best strategy for small businesses and start-ups. WebLogic Weekly for June 27th, 2011 | James Bayer Bayer shares the latest resources for those with WebLogic on the brain. Griffiths Waite at Oracle Open World | Mark Simpson Oracle ACE Director Mark Simpson share information on the presentations he's scheduled to give at Oracle OpenWorld San Francisco 2011. Kscope Solid Service Bus Implementations Peter Paul van de Beek's Kscope11 presentation "is aimed at supporting architects and especially developers to choose the right integration infrastructure for a job." Migration To Java EE 6 With Spring 3 - ...Could Become "Interesting" | Adam Bien "Put simply, big data implies datasets so large they can't normally be processed using a standard transactional database," says David Dorf. "The term 'noSQL' is often used in this context as well." Book Review: "Designing With the Mind In Mind" | Abhinav Agarwal According to Abhinav Agarwal, Jeff Johnson's new book is about "the theory of how the mind perceives information, of how humans understand what they read, and how our eyes are attuned to paying attention to not just what's happening in front of us but also at the periphery of our vision." BPM 11g Advanced Workshop | Martien van den Akker Martien van den Akker shares his thoughts on both the workshop he recently attended and on the Oracle BPM 11g product. Fusion Applications - What You Need To Know: Product Families | Floyd Teter "Fusion Applications are organized into seven groups of related products called Product Families," observes Oracle ACE Director Floyd Teter. "While the product features are organized according to the Business Process Model and can cross the boundaries of product families, the product family groupings are an easy way to wrap your mind around Fusion Apps." Grid Control: Refreshing Weblogic Domains | Dave Best Dave Best shares tips for avoiding problems when using grid control to centrally manage/monitor your environment. Webcast: Oracle to Announce Datanomic Integration Plans The combination of Datanomic technology and the previous acquisition of Silver Creek Systems will deliver a complete, integrated and best-of-breed solution for Data Quality. Learn about Oracle’s strategy and product plans and how the new products acquired from Datanomic will impact your organization. July 19, 2011, 8:00am PT / 11:00am ET. Speakers include Michael Weingartner (Vice President, Product Development, Oracle), Martin Boyd (Senior Director, Product Strategy, Oracle), and Dain Hansen (Director, Product Marketing, Fusion Middleware, Oracle).

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• Snow Leopard - resolving hostnames issue

  - by romant

  This worked in Leopard, although since Snowie came along … I have a Location setup with a DNS server to use [eg 10.0.0.17] , and a search string [eg sub.dom.ain.com] In the terminal: $ nslookup cake Server 10.0.0.17 Address: 10.0.0.17#53 Name: cake.sub.dom.ain.com Address: 10.0.0.38 So works like a charm. Although if I just the hostname cake in any other application within OSX - such as Safari/CoRD, they simply can't resolve the hostname. I have to instead use the FQDN cake.sub.dom.ain.com - why is this so? Why did this work in Leopard and is now broken? Would love a solution. Thanks

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• Windows 7 and XP Networking

  - by David-Zazeski

  I'm trying to setup a home network between a windows 7 and windows xp machine. I have a small hub. My XP computer has a manually assigned IP address (192.168.0.10) and I set my Windows 7 machine to have a manually assigned IP address (192.168.0.15). The XP computer works, but the Windows 7 machine does not see the network. It says that there is no connectivity. Ping does not work from either machine. Does anyone have any suggestions?

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• How to set up port forwarding and firewall settings for torrents using Transmsission on Mac OSX 10.5

  - by Liz

  I have picked up bits of advice here and there on the internet and got someway through this tortuous exercise (after it took 18 hours to download the first torrent I tried yesterday - magnet-link for a film). Where I have got stuck is with configuring the firewall on the Netgear Router but I am not sure if I have caused the problem myself by something else I have done configuring the Mac System Preferences for Security or Networking. I have been following the sections of these instructions that seem to apply, although they are written for a different OSX version (don't know which one, but the screen shots do not match what I see) and I am not wanting to set up my Mac as a server and attending to the parts that apply to port forwarding for Netgear rather than LinkSys: http://homepage.mac.com/car1son/static_port_fwd_intro.html I have been trying to follow these instructions: Instructions for DG834, DG834G, DG824M, FR114W, FM114P, FR114P, FR328S, FVL328, FVS328, FVS338, FVX538, FWAG114, FWG114P, or FVS318v3 These routers do port forwarding by assigning port numbers to a "service" associated with the application you want to run. "Rules" are set for particular services. Rules block or allow access, based on various conditions such as the time of day and the name of the service. To Create a New Inbound or Outbound Rule 1. Submit the router's address in an Internet browser. (The default is 192.168.0.1). 2. Enter the router's username and password. 3. From the main menu, click Security > Rules. 4. Click Add for inbound or outbound traffic, as appropriate to the application you are planning to run. 5. Select the Service. The services the router knows about are listed in the drop down. If the service you want is not listed, add it as described in the next section. 6. Select the Action, for example ALLOW always. 7. For Send to LAN Server, enter the IP address of the local server. Note that this is also the IP address the computers on your LAN will access. 8. For WAN User choose Any, or limit access to particular IP addresses. 9. For Log selection it is reasonable to turn logs on, especially at the beginning when you are unsure of the result of the changes you are making. Later, you may want to set logs to "Never" for performance reasons. 10. Click Apply. As noted in user manual for some models: * Consider using the Dynamic DNS feature on the Advanced menu, so that external users can find your network when the DHCP lease is renewed by your ISP. * If your own LAN server uses DHCP, and your IPs change on rebooting, consider using the Reserved IP Address feature in the LAN IP menu. To Add a Service for These Routers 1. Click Security > Services > Add Custom Service. 2. Enter any name you choose for the service. 3. Select whether the service is to use TCP or UDP. If you are unsure, select both. 4. Enter the lowest port number used by the service. 5. Enter the highest port number used. If the service uses only one port number, enter the same number. 6. Click Apply. There is no "Security - Rules" submenu in the Netgear page, so I have been trying to access "Security - Firewall Rules". I can access everthing else in the Netgear settings as Admin but I cannot get the "Firewall Rules" section to open up. (I am not 100% sure I will know exactly what to do if and when I do get it opened up!) I haven't managed to find though searching the internet any instructions that would seem to apply specifically to what I am trying to achieve, so would be very grateful if someone could either point me in the right direction or give me some advice directly. Best wishes, Liz

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• Netsh commands not working on remote computer

  - by Mike Christiansen

  Hello, At work, we are in the process of migrating over 200 computers from static IPs to DHCP. The DHCP server is configured. My biggest hurdle is physically going to every single computer in the area and configuring them all for DHCP. I am trying to use netsh to accomplish this. However, I cannot even seem to set one computer to DHCP remotely. The command I am trying is: netsh -r COMPUTERNAME interface ip set address name="Local Area Connection" source=dhcp netsh -r COMPUTERNAME interface ip set dns name="Local Area Connection" source=dhcp This results in the error The following command was not found: interface ip set address "name=Local Area Connection" source=dhcp. Any ideas?

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• Rate-Limit affects All clients or single IP?

  - by Asad Moeen

  Well up-til now I've considered iptables rate-limit commands with the "recent" module to work for each IP Address. For example rate-limit rule of 20k/s will trigger only if a single IP exceeds 20k/s rate and not if 4 different IPs exceed 5k/s rate. Please correct me if I considered this wrong as I've only used these rules for TCP/ UDP. But today I tried similar rules for ICMP and applied 4/s Input/Output. But then on trying to ping-test from just-ping.com I could see packet loss on almost all IP Addresses. How could that happen because if it worked for each IP Address then it wouldn't be triggering the rule because I believe each IP from just-ping has a rate of probably 1/s. I still think the first one is true because if it wasn't then my GameServer would block everyone if the combined rate ( in case of more connected players ) increased the threshold. This hasn't happened up til now so the ICMP thing really confused me. Thank you.

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• My processor is not detected intel core 2 duo

  - by walid

  My processor is not detected intel core 2 duo When I type $uname -m -p I get this i686 unknown I have Ubuntu 10.10 netbook remix but the cat /proc/cpuinfo gives right identification of two processors as below processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 CPU T5600 @ 1.83GHz stepping : 6 cpu MHz : 1826.000 cache size : 2048 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 2 apicid : 0 initial apicid : 0 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm dts tpr_shadow bogomips : 3657.99 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 CPU T5600 @ 1.83GHz stepping : 6 cpu MHz : 1826.000 cache size : 2048 KB physical id : 0 siblings : 2 core id : 1 cpu cores : 2 apicid : 1 initial apicid : 1 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm dts tpr_shadow bogomips : 3657.53 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: The problem is with programs that uses more than one core like virtualbox and bitcoin which refuses to use more than one core Is there anythign wrong or anything that I can do? My installation is from a live usb iso on a USB

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• Cisco IPSec, nat, and port forwarding don't play well together

  - by Alan

  I have two Cisco ADSL modems configured conventionally to nat the inside traffic to the ISP. That works. I have two port forwards on one of them for SMTP and IMAP from the outside to the inside this provides external access to the mail server. This works. The modem doing the port forwarding also terminates PPTP VPN traffic. There are two DNS servers one inside the office which resolves mail to the local address, one outside the office which resolves mail for the rest of the world to the external interface. That all works. I recently added an IPSec VPN between the two modems and that works for every thing EXCEPT connections over the IPSec VPN to the mail server on port 25 or 143 from workstations on the remote lan. It would seem that the modem with the port forwards is confusing traffic from the mail server destined for a machine on the other side of the IPSec VPN for traffic that should go back to a port forward connection. PPTP VPN traffic to the mail server is fine. Is this a scenario anybody is familiar with and are there any suggestions on how to work around it? Many thanks Alan But wait there is more..... This is the strategic parts of the nat config. A route map is used to exclude the lans that are reachable via IPSec tunnels from being Nated. int ethernet0 ip nat inside int dialer1 ip nat outside ip nat inside source route-map nonat interface Dialer1 overload route-map nonat permit 10 match ip address 105 access-list 105 remark *** Traffic to NAT access-list 105 deny ip 192.168.1.0 0.0.0.255 192.168.9.0 0.0.0.255 access-list 105 deny ip 192.168.1.0 0.0.0.255 192.168.48.0 0.0.0.255 access-list 105 permit ip 192.168.1.0 0.0.0.255 any ip nat inside source static tcp 192.168.1.241 25 interface Dialer1 25 ip nat inside source static tcp 192.168.1.241 143 interface Dialer1 143 At the risk of answering my own question, I resolved this outside the Cisco realm. I bound a secondary ip address to mail server 192.168.1.244, changed the port forwards to use it while leaving all the local and IPSec traffic to use 192.168.1.241 and the problem was solved. New port forwards. ip nat inside source static tcp 192.168.1.244 25 interface Dialer1 25 ip nat inside source static tcp 192.168.1.244 143 interface Dialer1 143 Obviously this is a messy solution and being able to fix this in the Cisco would be preferable.

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• SQL Azure: Notes on Building a Shard Technology

  - by Herve Roggero

  In Chapter 10 of the book on SQL Azure (http://www.apress.com/book/view/9781430229612) I am co-authoring, I am digging deeper in what it takes to write a Shard. It's actually a pretty cool exercise, and I wanted to share some thoughts on how I am designing the technology. A Shard is a technology that spreads the load of database requests over multiple databases, as transparently as possible. The type of shard I am building is called a Vertical Partition Shard  (VPS). A VPS is a mechanism by which the data is stored in one or more databases behind the scenes, but your code has no idea at design time which data is in which database. It's like having a mini cloud for records instead of services. Imagine you have three SQL Azure databases that have the same schema (DB1, DB2 and DB3), you would like to issue a SELECT * FROM Users on all three databases, concatenate the results into a single resultset, and order by last name. Imagine you want to ensure your code doesn't need to change if you add a new database to the shard (DB4). Now imagine that you want to make sure all three databases are queried at the same time, in a multi-threaded manner so your code doesn't have to wait for three database calls sequentially. Then, imagine you would like to obtain a breadcrumb (in the form of a new, virtual column) that gives you a hint as to which database a record came from, so that you could update it if needed. Now imagine all that is done through the standard SqlClient library... and you have the Shard I am currently building. Here are some lessons learned and techniques I am using with this shard: Parellel Processing: Querying databases in parallel is not too hard using the Task Parallel Library; all you need is to lock your resources when needed Deleting/Updating Data: That's not too bad either as long as you have a breadcrumb. However it becomes more difficult if you need to update a single record and you don't know in which database it is. Inserting Data: I am using a round-robin approach in which each new insert request is directed to the next database in the shard. Not sure how to deal with Bulk Loads just yet... Shard Databases:  I use a static collection of SqlConnection objects which needs to be loaded once; from there on all the Shard commands use this collection Extension Methods: In order to make it look like the Shard commands are part of the SqlClient class I use extension methods. For example I added ExecuteShardQuery and ExecuteShardNonQuery methods to SqlClient. Exceptions: Capturing exceptions in a multi-threaded code is interesting... but I kept it simple for now. I am using the ConcurrentQueue to store my exceptions. Database GUID: Every database in the shard is given a GUID, which is calculated based on the connection string's values. DataTable. The Shard methods return a DataTable object which can be bound to objects.  I will be sharing the code soon as an open-source project in CodePlex. Please stay tuned on twitter to know when it will be available (@hroggero). Or check www.bluesyntax.net for updates on the shard. Thanks!

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• Ranking hit after WP site migration

  - by Ben

  I migrated my site from its old domain over a month ago. I followed WMT completely, including 301 redirects from every existing URL to the new domain, and then submitting a change of address. Traffic continued as normal, but then a few days after submitting the change of address traffic plummeted to about 20-30% of what it was previously. Most of my traffic come from organic search, and I can see that for the keywords I had targeted before and performed well with and am now ranking much much lower for. In some cases for low competition keywords I've only lost a few places, for higher competition terms I have really suffered. This has started to pick up a bit (one of my keywords I have risen from 195 to 100 in the last week), but it seems to be a very slow process. How seamless is this process normally? I was under the impression that this would not affect my rankings too severely, but it has now been a month since the move and recovery seems to be very slow, if at all. Is it likely that I've missed something? The only change is that I have moved what was the home page to be more of a sub-page, and now in its place is a magazine-style home page. I understand that links to the old site will now be pointing to the latter which means that rankings for some keywords attributed to the old home page will take a hit, but even on other pages that seem to fit in exactly the same page structure as the previous site I have seen a drop in rankings. Any help would be greatly appreciated. Thanks!

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• Changing frontend cache

  - by Utsav

  Our architecture consists of a front-end cache that most read only users obtain their data from directly. The front-end cache sits in front of a farm of webservers that serve pages written in PHP. We need to be able to detect certain conditions at the front-end cache level and pass those values through to the back-end via HTTP headers. For example we would like to manually tag the carrier network based on the IP address. So, for incoming traffic if the user is say coming from an IP address in the range of "41.202.192.0"/19 we would tag them as being a Orange Cameroon user by setting the appropriate HTTP request header, e.g., X-Carrier = "Orange Cameroon". Based on the setting of this header we would like to vary the cache and serve a different banner to the end user. How would you go about doing this? Keep in mind that we don't want to pollute the cache and we also don't want to create too many small cache segments. Assumptions: You can assume that the X-Carrier has already been detected in our cache. So, for the purposes of your test you can just set this value manually in your example script.

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• chrooting user causes "connection closed" message when using sftp

  - by George Reith

  First off I am a linux newbie so please don't assume much knowledge. I am using CentOS 5.8 (final) and using OpenSSH version 5.8p1. I have made a user playwithbits and I am attempting to chroot them to the directory home/nginx/domains/playwithbits/public I am using the following match statement in my sshd_config file: Match group web-root-locked ChrootDirectory /home/nginx/domains/%u/public X11Forwarding no AllowTcpForwarding no ForceCommand /usr/libexec/openssh/sftp-server # id playwithbits returns: uid=504(playwithbits) gid=504(playwithbits) groups=504(playwithbits),507(web-root-locked) I have changed the user's home directory to: home/nginx/domains/playwithbits/public Now when I attempt to sftp in with this user I instantly get the message: connection closed Does anyone know what I am doing wrong? Edit: Following advice from @Dennis Williamson I have connected in debug mode (I think... correct me if I'm wrong). I have made a bit of progress by using chmod to set permissions recursively of all files in the directly to 700. Now I get the following messages when I attempt to log on (still connection refused): Connection from [My ip address] port 38737 debug1: Client protocol version 2.0; client software version OpenSSH_5.6 debug1: match: OpenSSH_5.6 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.8 debug1: permanently_set_uid: 74/74 debug1: list_hostkey_types: ssh-rsa,ssh-dss debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: client->server aes128-ctr hmac-md5 none debug1: kex: server->client aes128-ctr hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST received debug1: SSH2_MSG_KEX_DH_GEX_GROUP sent debug1: expecting SSH2_MSG_KEX_DH_GEX_INIT debug1: SSH2_MSG_KEX_DH_GEX_REPLY sent debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: KEX done debug1: userauth-request for user playwithbits service ssh-connection method none debug1: attempt 0 failures 0 debug1: user playwithbits matched group list web-root-locked at line 91 debug1: PAM: initializing for "playwithbits" debug1: PAM: setting PAM_RHOST to [My host info] debug1: PAM: setting PAM_TTY to "ssh" debug1: userauth-request for user playwithbits service ssh-connection method password debug1: attempt 1 failures 0 debug1: PAM: password authentication accepted for playwithbits debug1: do_pam_account: called Accepted password for playwithbits from [My ip address] port 38737 ssh2 debug1: monitor_child_preauth: playwithbits has been authenticated by privileged process debug1: SELinux support disabled debug1: PAM: establishing credentials User child is on pid 3942 debug1: PAM: establishing credentials Changed root directory to "/home/nginx/domains/playwithbits/public" debug1: permanently_set_uid: 504/504 debug1: Entering interactive session for SSH2. debug1: server_init_dispatch_20 debug1: server_input_channel_open: ctype session rchan 0 win 2097152 max 32768 debug1: input_session_request debug1: channel 0: new [server-session] debug1: session_new: session 0 debug1: session_open: channel 0 debug1: session_open: session 0: link with channel 0 debug1: server_input_channel_open: confirm session debug1: server_input_global_request: rtype [email protected] want_reply 0 debug1: server_input_channel_req: channel 0 request env reply 0 debug1: session_by_channel: session 0 channel 0 debug1: session_input_channel_req: session 0 req env debug1: server_input_channel_req: channel 0 request subsystem reply 1 debug1: session_by_channel: session 0 channel 0 debug1: session_input_channel_req: session 0 req subsystem subsystem request for sftp by user playwithbits debug1: subsystem: cannot stat /usr/libexec/openssh/sftp-server: Permission denied debug1: subsystem: exec() /usr/libexec/openssh/sftp-server debug1: Forced command (config) '/usr/libexec/openssh/sftp-server' debug1: session_new: session 0 debug1: Received SIGCHLD. debug1: session_by_pid: pid 3943 debug1: session_exit_message: session 0 channel 0 pid 3943 debug1: session_exit_message: release channel 0 debug1: session_by_channel: session 0 channel 0 debug1: session_close_by_channel: channel 0 child 0 debug1: session_close: session 0 pid 0 debug1: channel 0: free: server-session, nchannels 1 Received disconnect from [My ip address]: 11: disconnected by user debug1: do_cleanup debug1: do_cleanup debug1: PAM: cleanup debug1: PAM: closing session debug1: PAM: deleting credentials

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• Can not access Internet (DNS names do not resolve) after update today

  - by Aras

  I have been using Precise for a few weeks now for work with no problem. Today, I am not able to access any website using either wired or wireless connections. I installed the updates today which included nautilus, xserver, and a new kernel (3.2.0-24). After restarting I no longer was able to browse the Internet using firefox or chrome. Trying to ping google in terminal gives ping: unknown host google.ca I have tried: Connecting to wireless or wired networks (both working on other machines) Restart the machine and boot with previous Kernel Manually configure opendns on my wired connection Restart the network and the laptop and the wireless card Without any success so far. I am not sure where to go next. Please let me know the cause of the issue or help me troubleshoot it. Note that the laptop does receive an ip address, and it can ping ip address of google.ca (74.125.127.94) but not the domain name, or any domain name for that matter. This system was upgraded from 11.10 to 12.04 more two weeks ago.

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