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• Ethernet card not detected on Ubuntu Server 12.04

  - by Dana

  My onboard ethernet isn't detected after a re-install of Server 12.04. For reasons I won't get into here, I had to put the server's drive into another machine to install Ubuntu, then swap back into the server. So the server starts up fine, except for the "Waiting for network configuration". I read in another article that Server, by default, doesn't handle new mac addresses for hardware changes dynamically, unlike Ubuntu Desktop, but a look at /etc/udev/rules.d/70-persistent-net.rules shows only one ethernet interface. Shouldn't it show both the old, and the new? lspci -vv shows an ethernet interface, so what the heck is going on? I should mention that the onboard LAN is enabled in the BIOS. And I know this isn't important, but all this started when I changed some network configuration settings in webmin before the re-install. It couldn't download any updates, so I tinkered a little. Broke, it, installed FreeNAS, which worked, but I didn't like it, then went back to Ubuntu Server, and now I'm in this pickle. Thanks for any advice!

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• Oracle OpenWorld São Paulo Is Back!

  - by Kristin Rose

  Guess what’s back and bigger than ever! Oracle OpenWorld São Paulo, and we can’t wait to see YOU there! Be part of the first ever Oracle PartnerNetwork Exchange Latin America, a program that incorporates special activities specifically tailored to you, our partners. OracleOpenWorld Latin America is taking place from December 4th – 6th at the Transamerica Expo Center, so if you haven’t already registered, hurry and do so to take advantage of our Early Bird pricing here! This year’s jam-packed agenda includes keynotes from Hugo Freytes, SVP of Latin America Alliances and Channels, Judson Althoff, SVP of Worldwide Alliances and Channels and many more! The OPN Keynote session will take place on December 5th from 10:00am to 12:00am, and the program will feature four tracks including Applications, Cloud, Engineered Systems and Technology for partners, complete with endless content! Click here to view the Oracle OpenWorld Latin America Oracle PartnerNetwork Agenda. Also, we wanted to offer a huge THANK YOU to our 2012 Oracle PartnerNetwork Exchange Latin America and Lounge sponsors: Avnet and Preteco! Be sure to stop by our Oracle PartnerNetwork Lounge to hold meetings, network with your peers, and engage in relevant conversations with your partners, customers and other industry professionals. Finally, don’t wait to register! Early Bird Pricing for OPN Exchange @ OpenWorld has ends November, 23. You really don't want to miss this great opportunity to learn, network, and be a part of the experience. Register here! Welcome to the new Oracle PartnerNetwork Exchange @ OpenWorld Latin America 2012! The OPN Communications Team

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• Sonicwall settings for Polycom TFTP

  - by Michael Glenn

  I'm switching our VoIP phones (Polycom 301s and 501s) to our data network. They were previously segmented to their own network. This means disabling the DHCP on the Trixbox (Asterisk) server and configuring the Sonicwall TZ 210 DHCP to indicate that Trixbox is the TFTP server. The Polycom phones are stating "could not contact boot server". All phones are configured to TFTP and were confirmed working when previously using the Trixbox server for DHCP. Trixbox DHCP is now turned off. I've configured options 66(as String), 128(as IP) and 150(as IP) in DHCP and added them to a TFTP Option Group. I've enabled "Allow BOOTP Clients to use Range" for the Dynamic IP range and assigned the Option Group TFTP as the DHCP Generic Option Group. Any idea what I'm missing? Is there a separate tool to inspect the DHCP response to compare Trixbox to the Sonicwall?

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• Set up router to vpn into proxy server

  - by NKimber

  I have a small network with a single LinkSys router connected to broadband in US via Comcast. I have a VPN proxy server account that I can use with a standard Windows connection, allowing me to have a geographic IP fingerprint in Europe, this is useful for a number of purposes. I want to setup a 2nd router that automatically connects via VPN to this proxy service, so any hardware that is connected to router 2 looks as though it is originating network requests in Europe, and any hardware connected to my main router has normal Comcast traffic (all requests are originating from USA). My 2nd router is a LinkSys WRT54G2, I'm having trouble getting this configured. Question, is what I'm trying to do even feasible? Should the WRT54G2 be able to do this with native functionality? Would flashing it with DD-WRT allow me to achieve my objectives? Any help/suggestions much appreciated. Neil

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• How add cpu frequency that should be available?

  - by Andrew Redd

  I have a system with an Intel Core i7 970 that should be able to run at 3.2 GHz. I'm running ubuntu 12.04 and installed the cpufreq indicator to be able to change the governor and noticed that I only had frequencies up to 2.0 GHz available to me. I set to performance and checked with cpufreq-info cpufreq-info -c 0 cpufrequtils 007: cpufreq-info (C) Dominik Brodowski 2004-2009 Report errors and bugs to [email protected], please. analyzing CPU 0: driver: acpi-cpufreq CPUs which run at the same hardware frequency: 0 1 2 3 4 5 6 7 8 9 10 11 CPUs which need to have their frequency coordinated by software: 0 maximum transition latency: 10.0 us. hardware limits: 1.60 GHz - 2.00 GHz available frequency steps: 2.00 GHz, 1.86 GHz, 1.73 GHz, 1.60 GHz available cpufreq governors: conservative, ondemand, userspace, powersave, performance current policy: frequency should be within 1.60 GHz and 2.00 GHz. The governor "performance" may decide which speed to use within this range. current CPU frequency is 2.00 GHz (asserted by call to hardware). cpufreq stats: 2.00 GHz:4.93%, 1.86 GHz:0.03%, 1.73 GHz:0.02%, 1.60 GHz:95.02% (718654) And to double check: $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies 1995000 1862000 1729000 1596000 How do I get all the frequencies that I should have available to me, all up to the 3.2 GHz?

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• Why is my router assigning the wrong address via DHCP

  - by Barry

  I have a WRT54G router that is set up to serve out addresses via DHCP. It correctly serves up addresses to every other machine on the network, including another PC, my macbook when connected via wireless, my wife's notebook, and our printer. However, whenever I attach my macbook to the router via an ethernet cable, the address it is given via DHCP is wrong. My local network is set up as 192.168.1.*. However, when my macbook connects with an ethernet cable, it is given the IP 192.168.29.*. Currently, I have the macbook set up with a manual IP address, and all seems to be working fine. Any ideas on what could be causing this?

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• wmware fusion 5.0.1, LAN, disconnecting from server [closed]

  - by Maxim

  Currently I am using : OSX 10.7.5 VMWare:5.0.1 with windows 7 professional Problem: Getting disconnected from LAN game. Description: 4 of us are trying to play frozen throne on the same network. The thing is, they are all running windows computers, and I am running W7 on VMware. I haven't made any adjustments other than changing from "sharing internet with my mac" to Bridged network "autodetect". When we start to play, everything works then all of a sudden I get disconnected. This happens every once in a while, the timing differs from time to time. None of the others ever disconnects. What could be the problem? Thanks for the help!

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• SQL Azure Security: DoS

  - by Herve Roggero

  Since I decided to understand in more depth how SQL Azure works I started to dig into its performance characteristics. So I decided to write an application that allows me to put SQL Azure to the test and compare results with a local SQL Server database. One of the options I added is the ability to issue the same command on multiple threads to get certain performance metrics. That's when I stumbled on an interesting security feature of SQL Azure: its Denial of Service (DoS) detection engine. What this security feature does is that it performs a check on the number of connections being established, and if the rate of connection is too high, SQL Azure blocks all communication from that machine. I am still trying to learn more about this specific feature, but it appears that going to the SQL Azure portal and testing the connection from the portal "resets" the feature and you are allowed to connect again... until you reach the login threashold. In the specific test I was performing, all the logins were successful. I haven't tried to login with an invalid account or password... that will be for next time. On my Linked In group (SQL Server and SQL Azure Security: http://www.linkedin.com/groups?gid=2569994&trk=hb_side_g) Chip Andrews (www.sqlsecurity.com) pointed out that this feature in itself could present an internal threat. In theory, a rogue application could be issuing many login requests from a NATed network, which could potentially prevent any production system from connecting to SQL Azure within the same network. My initial response was that this could indeed be the case. However, while the TCP protocol contains the latest NATed IP address of a machine (which masks the origin of the machine making the SQL request), the TDS protocol itself contains the IP Address of the machine making the initial request; so technically there would be a way for SQL Azure to block only the internal IP address making the rogue requests.  So this warrants further investigation... stay tuned...

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• Configuring Ubuntu for Global SOCKS5 proxy

  - by x50

  Does anyone know the best way to configure Ubuntu to use a SOCKS5 proxy for all network traffic? Server is ubuntu server - all cli. So I cannot set via the Proxy Settings GUI. We want to push all outbound traffic through the proxy (apt-get, http, https, etc). I do need to separate ssh traffic so it stays locally. Everything else should hit the proxy server. not that it matters, but I'm using Squid for the proxy server. I know this is easy on Mac and Windows as you can set a proxy on the actual network interface. Can you do the same on Ubuntu?

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• All nework interfaces hang for seconds while one interface goes up/down

  - by user3698377

  I am building a client/server application that uses several network interfaces in parallel for redundancy, and I have noticed that while one network interface goes down or goes up, the communication on other interfaces hangs for several seconds. I could reproduce this behavior without my application in a simple way: there are 2 interfaces available on computer 1 ( Ethernet and WiFi ) ping from computer 2 the IP address of the Ethernet connection of computer 1 disconnect the WiFi of computer 1 ping hangs for seconds, and then the packets are traveling again between the 2 computers. The hanging happens as well if I turn back on the WiFi connection on computer 1. It happens as well if I ping the WiFi IP, and turn off/on the Ethernet connection ( or unplug/plug the cable). I am using Linux Ubuntu 12.04 on both computers. Any ideas why is this happening, and if / how can it be avoided?

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• VMXNET3 nic loses the ability to update ARP table after N hours

  - by Peter

  I have a fedora 18 VM that stops updating the arp table on eth1 after running for a number of hours to days. There are other VMs on the same hypervisor that can access all of the same networks without issue. A tcpdump of the offending NIC shows only ARP broadcasts but no responses. None of the other VMs on the vDS see the ARP broadcasts from the offending NIC. The only way I can currently solve the problem is to reboot the VM and then everything works for a while. I've tried changing the port on the vDS and even flipping the network configurations after I lose eth1's ARP table, but the ARP problem follows eth1 but I can access the machines that were originally on eth1. If I statically add the arp entries for machines on the same subnet I have no problems with connectivity. The Hypervisor is an HP BL49X series with flex-10 network modules. Has anyone seen anything like this before?

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• Can't complete dropbox installation from behind proxy

  - by Mark Jones

  Problem: My PC on campus sits behind a proxy (requiring authentication) and I can't setup Dropbox. I am convinced that this is a proxy issue as I can't setup Ubuntu one either (but I don't use Ubuntu One so that is not a problem). I have looked at the Ubuntu One fix but it seems to be to modify settings explicitly related to Ubuntu One. I can install the nautilus-dropbox package (compiled from source and from .deb package from website and from software centre) but once I click OK from the "Dropbox Installation" dialog box (prompting me to download the proprietary daemon) the installation just freezes with the OK button pressed. When I look at its process in System Monitor its waiting channel is inet_wait_for_connect. I have set the following proxy directives thus far: Added mj22:**@proxy.waikato.ac.nz:80 information to network proxy settings under network in settings. Added http_host and http_port variables under gconf-editor-system-proxy Added 'host', 'authentication_password' 'authentication_user' and ticked 'user authentication' and 'use_http_proxy' under gconf-editor-system-http_proxy Added export http_proxy="http://mj22:**@proxy.waikato.ac.nz:80/" to /etc/bash.bashrc Added Acquire::http::proxy "http://mj22:**@proxy.waikato.ac.nz:80/"; to /etc/apt/apt.conf (which is what I imagine is letting Software Center retrieve packages). (where ** is my password) I have also added the equivalent ftp and https lines for the above entries. I get the internet fine and Software Centre can download packages but thats it. Related issues: The software centre can't fetch reviews (but can download packages). When trying to add an online account in Gnome 3 a dialog pop up appears with "Error getting a Request Token: Cannot connect to proxy (proxy.waikato.ac.nz)" Updates: After some time (10mins ish) Dropbox shows an error dialog box that reads: Trouble connecting to Dropbox servers. Maybe your internet connection is down, or you need to set you http_proxy environment variable. Is there a way I can see what environment variables are currently set?

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• ISA Server Route Add Question

  - by Kip

  Hi All, I have a situation where I have and ISA 2006 server (on Win2k3) that has an internal and an externaly facing NIC's. All works fine but I need to add a couple of routes for the following reason: Our monitoring software is on a different network. Our Terminal server is on a different network. Currently, access to the internet, through this proxy server, from the terminal server fails. Also, monitoring of the ISA server via a remote monitor or the installed agent talking to the remote monitor (BMC) also fails. The default enterprise rule on ISA blocks the traffic as I beleive it doesn't trust / know about those networks. Here is my routing table: I need to add a couple of address, but this one being the main one: 192.168.245.137 / mask 255.255.255.192 / gateway 192.168.245.129 But I can't get it to work. Routing is not my strong point but at the moment have no one else available to help. Can you offer any assistance? Please ask if you need more info

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• Proper way for changing MAC address in a linux VM?

  - by HappyDeveloper

  I tried to change the MAC address in a ubuntu VM (virtualbox), but after that it threw lots of errors during boot, and then I had no internet connection. Then I saw that the interface was renamed to eth1, so I edited /etc/network/interfaces to change eth0 to eth1, rebooted (didn't know how to restart the network), and boot was now faster and internet worked fine. But now after every time I log in, I get 1 or 2 error messages that say nothing, they only ask me if I want to report them. So I was wondering, is there was a proper way to change MAC address, to avoid these issues?

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• Running 12.04 as a gateway - resolvconf, dhclient and dnsmasq integration

  - by Adam

  I have a gateway server which is set up originally with Ubuntu desktop 12.04 - perhaps a mistake, I don't know, something to bear in mind. I ripped out network-manager and now want to get resolvconf, dhclient and dnsmasq to play well together. dhclient gets the gateway's eth0 WAN ip address and the ISP DNS name server from the modem. dnsmasq needs to serve dhcp to the rest of the lan on eth1 and acts as a DNS cache both for the lan and for the gateway machine. I also set up iptables as a firewall. Right now, the gateway's /etc/resolv.conf shows only name server = 127.0.0.1 which is correct AFAIK. However I don't think that dhclient is giving dnsmasq the ISP DNS name server nor is dnsmasq picking up the OpenDNS and Google name servers I specified in /etc/network/interfaces - at the moment look-ups, i.e. ping or surfing, don't work unless I manually edit /etc/resolv.conf to put in an upstream name server like 8.8.8.8 So I removed the resolvconf package. Now I'm not getting dhcp on my lan and I'm not able to do DNS look-ups on the host itself - I can surf and ping on the net, but not 127.0.0.1. Where do I go from here? This setup with the config for dhclient and dnsmasq, and the same resolv.conf and hosts files worked on my old debian box.

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• OSX Reset Home Permissions and ACLs - how long should it take?

  - by andyface

  Having screwwed up my permissions by trying to have two users accessing one home folder I'm now going through the process of reseting my main user home permissions via the OSX install disk utilities, which seems to be taking a while. Does this process take a while to do, though I assume it depends on how many files I have in the folder, which in my case is a good few 100 GBs. At what point should I be concerned that it may have got stuck and thus reset my computer and try again? I assume, though not sure that if the little circle indicator is still moving then it's not completely frozen, but as there's no progress bar or details I'm not sure how true that is.

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• Centos and dell PowerEdge Rxxx Series.

  - by OrenM

  hi we lately purchase few dell servers all of them from Rxxx series couple of R410 and R710 the OS we used on those servers is: CentOS 5.4 we're getting very weird error messages and we lost network connectivity couple of times (restarting the network interface was needed to fix it) the messages we're getting are: Message from syslogd@ at Wed Nov 18 12:07:08 2009 ... servername kernel: Uhhuh. NMI received for unknown reason 20. Message from syslogd@ at Wed Nov 18 12:07:08 2009 ... servername kernel: Do you have a strange power saving mode enabled? Message from syslogd@ at Wed Nov 18 12:07:08 2009 ... servername kernel: Dazed and confused, but trying to continue we have never seen those messages in the previous series of dell poweredge servers do someone here using centOS 5.4 on Rxxx series? did it happen to him too? maybe you have a suggestion about how to prevent it from happening

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• Track IP Messenger's chatting by wireshark

  - by Kumar P

  We have Linux server ( RHEL 5 ), and some client machines ( Windows XP ) in local area network. We using server as proxy server. I am using squid proxy. My windows machines using internet by proxy. Now my client machines using IP messenger for chatting and sharing files with in local network. How can i trace what they are doing or chatting by ip messenger, from my server by wireshark packet sniffer ? If i can't do it by wireshark , What will you give idea about it...

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• DNS server at router level vs. computer level

  - by Craig

  I've three questions. Is it better/faster/optimal to set up your server's preferred and alternate DNS servers in your OS's network settings or in your router settings? Will it cause problems if it is set up in both places, both pointing to the same IPs? I am running Windows and I have my network assign a static IP to one of my computers. This doesn't allow me to obtain the DNS server addresses from my router automatically. Is there an IP I can put in that will cause it to take the DNS server addresses from the router?

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• networking tunnel adapter connections?

  - by Karthik Balaguru

  I understand that Tunnel Adapter LAN is for encapsulating IPv6 packets with an IPv4 header so that they can be sent across an IPv4 network. Few queries popped up in my mind based on this :- If i do 'ipconfig', Apart from ethernet adapter LAN details, I get a series of statments as below - Tunnel adapter Local Area Connection* 6 Tunnel adapter Local Area Connection* 7 Tunnel adapter Local Area Connection* 12 Tunnel adapter Local Area Connection* 13 Tunnel adapter Local Area Connection* 14 Tunnel adapter Local Area Connection* 15 Tunnel adapter Local Area Connection* 16 Except for the *16, all the other Tunnel Adapter Local Area Connections show Media Disconnected. Why is the numbering for the Tunnel adapter LAN not sequential? It is like 6, 7, 12, 13, 14, 15, 16. A strange numbering scheme! I tried to figure it out by thinking of some arithmetic series. But, it does not seem to fit in. There is a huge gap between 7 and 12. Any ideas? What is the need for so many Tunnel Adapter LAN connections? Can you tell me a scenario that requires all of those ? I did ipconfig /all to get more information. From the listing, I understand that: 16, 15, 14, 12 are Microsoft 6to4 Adapters 13, 6 are isatap Adapters 7 is Teredo Tunneling Pseudo-interface I understand that the above are for automatic tunneling so that the tunnel endpoints are determined automatically by the routing infrastructure. 6to4 is recommended by RFC3056 for automatic tunneling that uses protocol 41 for encapsulation. It is typically used when an end-user wants to connect to the IPv6 Internet using their existing IPv4 connection. Teredo is an automatic tunneling technique that uses UDP encapsulation across multiple NATs. That is, It is to grant IPv6 connectivity to nodes that are located behind IPv6-unaware NAT devices ISATAP treats the IPv4 network as a virtual IPv6 local link, with mappings from each IPv4 address to a link-local IPv6 address. That is to transmit IPv6 packets between dual-stack nodes on top of an IPv4 network. That is, to put in simple words, ISATAP is an intra-site mechanism, while the 6to4 and Teredo are for inter-site tunnelling mechanisms. It seems that Teredo should alone enabled by default in Vista, But my system does not show it to be enabled by default. Interestingly, it shows a 6to4 tunnel adapter (Tunnel adapter LAN connection 16) to be enabled by default? Any specific reasons for it? If i do ipconfig /all, why is only one Teredo present while four 6to4 are present ? I searched the internet for answers to the above queries, but I am unable to find clear answers.

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• Computer disappeared from Workgroup

  - by Moayad Mardini

  I've a LAN that has 8 computers running Windows XP and only one (Computer A) running Windows Server 2003. When computer A boots, it shows up in all computers' Workgroups, but after 15-30 minutes, it disappears from the Workgroup in all computers, including itself. However, files can still be transferred from and to A via full path shortcuts and network drive maps still work. I don't know if this has anything to do with the problem or not, but if that particular computer is turned on while the LAN cable is plugged in, it doesn't connect to the network, but it connects if the cable is plugged in after the computer is run. Any tips why this is happening? Thanks.

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• static routes, cisco ASA, remote locations

  - by Jeff

  192.168.3.1(ASA) - 192.168.2.1(ASA) - ( internet ) - 192.168.1.1(ASA) DomainController, FS, Exchange 192.168.0.1(ASA) - above is a rough idea what my network setup looks like. each internal ip (192.168.x.x) is located behind an ASA. Each location has a different gateway for the internet. They all talk to the 192.168.1.1 network for dns, dhcp, dc, exchange and so on. They can only see the 192.168.1.1, they can not see each other. In my Static Routes on my 192.168.1.1 ASA, should i have them configure as follows? example: 192.168.x.x 255.255.255.0 Locations_Internet_Gateway_IP OR 192.168.x.x 255.255.255.0 Main_Locations_Internet_Gateway_IP not sure which configurtation is correct, thanks in advance for any help!

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• Oracle VM 3: New Patch Set! (or Mega Millions winner?...you decide!..)

  - by Adam Hawley

  Today, my favorite number is 14736185 (despite the fact that it did not win me $249million in the MegaMillions lottery...or did it?)!  Why?  Because it is our latest patch release and it is chock-full of good stuff for the Oracle VM 3.0 user.  Oracle VM support customers can find it on My Oracle Support as patch number 14736185.   This can be installed on Oracle VM 3.0.x systems as an incremental patch on top of 3.0.3, so if you previously ran 3.0.3 GA or updated to 3.0.3 patch 1 ( build 150) this will just apply on top.  We're recommending you update to this patch set at your earliest convenience.  For more details, see below but also see Wim Coekaert's blog with related info here. Oracle VM Manager Update Instructions Oracle VM Manager 3.0.2 or 3.0.3 can be upgraded to this Oracle VM Manager 3.0.3 patch update. Unzip the patch file on the server running Oracle VM Manager and execute the runUpgrader.sh script. # ./runUpgrader.sh Please refer to Oracle VM Installation and Upgrade Guide for details. Upgrade Oracle VM Servers It's highly recommended to update Oracle VM Server 3.0.3 with the latest patch update. Please review Oracle VM 3.0.3 User Guide http://docs.oracle.com/cd/E26996_01/e18549/BABDDEGC.html for specific instructions how to use Yum repository to perform the server update. To receive notification on the software update delivered to Oracle Unbreakable Linux Network (ULN, http://linux.oracle.com) for Oracle VM, you can sign up here http://oss.oracle.com/mailman/listinfo/oraclevm-errata.  Additional Information Oracle VM documentation is available on the Oracle Technology Network (OTN):http://www.oracle.com/technetwork/server-storage/vm/documentation/index.html  Please refer to the Oracle VM 3.0.3 Release Notes for a list of features and known issues. For the latest information, best practices white papers and webinars, please visit http://oracle.com/virtualization

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• How do I rate limit google's crawl of my class C IP block?

  - by Zak

  I have several sites in a class C network that all get crawled by google on a pretty regular basis. Normally this is fine. However, when google starts crawling all the sites at the same time, the small set of servers that back this IP block can take a pretty big hit on load. With google webmaster tools, you can rate limit the googlebot on a given domain, but I haven't found a way to limit the bot across an IP network yet. Anyone have experience with this? How did you fix it?

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• How does bridged networking work?

  - by agz

  How does bridged networking work? I have looked through the virtualbox manuals but nothing extremely technical came up (It was just a generic gloss over of the topic) How does it assign a different ip to the virtual machine but uses the same network card? Why does this different ip (I found using ip addr under linux) not show up under the "attached devices section" of my router but I can port forward to it? How come if I connect to a password protected wifi network, it does not require me to enter my password? Is this multihoming?

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