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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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  • Edimax wireless router is not providing DNS services correctly

    - by Nathan Fellman
    I have an Edimax router that is set up to connect to the internet via L2TP on cable, and on the LAN side it's set up as a DHCP server. The DHCP server gives correct IP addresses, but it sets itself up as the DNS server. However, it doesn't provide the DNS service. I am sure that it's a problem with the router, because I have two computers on the network with the same problem. I see that on the WAN side it gets correct DNS addresses from the ISP, so I'd expect the router to either pass these addresses through to the DHCP clients, or to serve the DNS requests itself by forwarding them to the ISP's DNS. However, it apparently does neither, and there is no DNS. I switched from ADSL to cable last week. On ADSL it connected using PPPoE, and the DNS worked fine. What can be the problem here?

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  • Ubuntu Server 12.04 as a router. Problem with DNS

    - by Lorenzo
    I have a virtualbox lab made up of 4 Windows 2008 R2 servers (DC/DNS,SQL,SHAREPOINT, EXCHANGE) that are configured with static ip addresses with NIC's attached to Internal network. Everything works. I had the requirement to execute some tests that also access external services available on the internet. To keep things clean and similar to the production environment I have installed another VM, with Ubuntu Server 12.04 64 bit and configured (I hope) to work as a router like described on this post. This VM has two network interfaces: first is Bridged with the host and is used as a WAN connection and the other one attached in the Internal Network with its own static IP address on the internal network subnet. But actually the Windows servers does not connect to the internet while the unix one connects. I did a route command. this is the result: Kernel IP Routing table Destination Gateway Genmask Flags Metric Ref Use Iface default 10.69.121.1 0.0.0.0 UG 100 0 0 eth0 10.69.121.0 * 255.255.255.0 U 0 0 0 eth0 192.168.83.0 * 255.255.255.0 U 0 0 0 eth1 Can somebody help me with this configuration? :) Thanks! Addendum: I forgot to mention that one of the windows server hosts a DNS service for which I should maybe configure a forwarding server but I do not exactly know which server to forward on... :(

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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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  • SNMP counter issues with cisco RV082

    - by Chance
    Does anyone else poll this router with SNMP? We are using firmware version: 2.0.0.19-tz We are having problems with the traffic counters, some of them appear to be implemented as 16 bit counter instead of 32 bit counters. The reason this is causing problems is that they roll over (at 65,000) to 0 in less than our minute polling cycle, really skewing our metrics. The counter for the Lan (interface 2) seems to be functioning properly, however interfaces 3 and 4 (WAN and DMZ / WAN2) rollover at 65000. Tue May 11 08:38:31 EDT 2010 IF-MIB::ifInOctets.1 = Counter32: 137634 IF-MIB::ifInOctets.2 = Counter32: 1865677943 IF-MIB::ifInOctets.3 = Counter32: 12450 IF-MIB::ifInOctets.4 = Counter32: 49354 Look at counter IF-MIB::ifInOctets.4 5 seconds later: Tue May 11 08:38:36 EDT 2010 IF-MIB::ifInOctets.1 = Counter32: 137634 IF-MIB::ifInOctets.2 = Counter32: 1865836207 IF-MIB::ifInOctets.3 = Counter32: 13167 IF-MIB::ifInOctets.4 = Counter32: 12900 Any suggestions? Seems like a bug to me, however I just wanted to make sure I wasn't crazy.. Thanks!

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  • How to format HDD with MHDD Tool.

    - by PP
    I have copied MHDD application on a bootable CD and i wan to use it to low level format my HDD which had some bad sectors on it. so how can mark these badsecotrs using MHDD application? Pluse can i partition/format my HDD using MHDD because after low level format i want to setup window xp on that drive. can some one explain me step by step procedure to how to lovel format driven and partition/format it and then setup xp on that. Link to MHDD app. http://hddguru.com/content/en/software/2005.10.02-MHDD/ Thanks, PP.

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  • Installing router - failed to verify router settings

    - by Andi
    I'm trying to install a TP-Link wireless router. I am using a modem an have a PPPoE connection. I connected the router to the computer and the modem, but in the last step of the Easy Setup it says " Failed to verify router settings. 1. Please check the WAN connection type and parameters. 2. Please check your connectivity and retry." The internet works fine if i connect the modem directly to the computer. When I connect the computer to the router, the wireless network is detected by other devices, but cannot be accessed. I accessed the router settings, and everything seems normal, except that it just says "Connecting...". It never manages to connect to the internet. I tried restarting the router and several walkthroughs on the web, but I couldn't get it to work.

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  • CISCO 2911 Router configuration

    - by bala
    Device cisco 2911 router configuration support is required please. I have exchange server 2010 configured and working without any errors the problem is in cisco router configuration when exchange server sends emails out the receives WAN IP not the public ip. I have configured RDNS lookups with our MX record IP addesses that match the FQDN but all our emails are rejected because it does not match with the public ip. Receiving mails problem is not an problem all mails are coming through. i am sure i am missing something on the router configuration that does not sends the public ip, can any one help me to solve this issue. Note; I've got 1 WAN IP & 8 Public IP from ISP . Find below the running configuration. Building configuration... Current configuration : 2734 bytes ! ! Last configuration change at 06:32:13 UTC Tue Apr 3 2012 ! NVRAM config last updated at 06:32:14 UTC Tue Apr 3 2012 ! NVRAM config last updated at 06:32:14 UTC Tue Apr 3 2012 version 15.1 service timestamps debug datetime msec service timestamps log datetime msec service password-encryption ! hostname BSBG-LL ! boot-start-marker boot-end-marker ! ! enable secret 5 $x$xHrxxxxx5ox0 enable password 7 xx23xx5FxxE1xx044 ! no aaa new-model ! no ipv6 cef ip source-route ip cef ! ! ! ! ! ip flow-cache timeout active 1 ip domain name yourdomain.com ip name-server 213.42.20.20 ip name-server 195.229.241.222 multilink bundle-name authenticated ! ! crypto pki token default removal timeout 0 ! ! license udi pid CISCO2911/K9 ! ! username bsbg ! ! ! ! ! ! interface Embedded-Service-Engine0/0 no ip address shutdown ! interface GigabitEthernet0/0 ip address 192.168.0.9 255.255.255.0 ip flow ingress ip nat inside ip virtual-reassembly in duplex auto speed 100 no cdp enable ! interface GigabitEthernet0/1 ip address 213.42.xx.x2 255.255.255.252 ip nat outside ip virtual-reassembly in duplex auto speed auto no cdp enable ! interface GigabitEthernet0/2 no ip address shutdown duplex auto speed auto ! ip forward-protocol nd ! no ip http server no ip http secure-server ! ip nat inside source list 120 interface GigabitEthernet0/1 overload ip nat inside source static tcp 192.168.0.4 25 94.56.89.100 25 extendable ip nat inside source static tcp 192.168.0.4 53 94.56.89.100 53 extendable ip nat inside source static udp 192.168.0.4 53 94.56.89.100 53 extendable ip nat inside source static tcp 192.168.0.4 110 94.56.89.100 110 extendable ip nat inside source static tcp 192.168.0.4 443 94.56.89.100 443 extendable ip nat inside source static tcp 192.168.0.4 587 94.56.89.100 587 extendable ip nat inside source static tcp 192.168.0.4 995 94.56.89.100 995 extendable ip nat inside source static tcp 192.168.0.4 3389 94.56.89.100 3389 extendable ip nat inside source static tcp 192.168.0.4 443 94.56.89.101 443 extendable ip nat inside source static tcp 192.168.0.12 80 94.56.89.102 80 extendable ip nat inside source static tcp 192.168.0.12 443 94.56.89.102 443 extendable ip nat inside source static tcp 192.168.0.12 3389 94.56.89.102 3389 extendable ip route 0.0.0.0 0.0.0.0 213.42.69.41 ! access-list 120 permit ip 192.168.0.0 0.0.0.255 any ! ! ! control-plane ! ! ! line con 0 exec-timeout 5 0 line aux 0 line 2 no activation-character no exec transport preferred none transport input all transport output pad telnet rlogin lapb-ta mop udptn v120 ssh stopbits 1 line vty 0 4 password 7 xx64xxD530D26086Dxx login transport input all ! scheduler allocate 20000 1000 end

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  • Access Other Computer via ADSL Modem and Router

    - by Sohail
    My network configuration is like this ISP - Modem - Router - Computer and the same goes for my friend. We want to share large files or to access each other's computer. The Passwords to login to the web page of each other modems are known. I mean, we can access each other Modem Web GUI easily ( because we know the WAN IP of each other modem ). The question is how do i access his or how do he access my computer? Is there any way to do so. Remote desktop connection is not working :( Please help

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  • Updating Cisco VPN config to add vpnc support

    - by Igor Kuzmitshov
    I have a Cisco 1841 configured for VPN connections of two types: Peer-to-peer for partners' routers (IPsec) — using different crypto isakmp key and crypto map with set peer, set transform-set, match address for every peer (same map name, different priorities). That crypto map name is added to the WAN interface. Client access (PPTP) — using vpdn-group with accept-dialin protocol pptp. Now, a new partner wants to connect using vpnc client. The latter needs IPSec ID (group name) and IPSec secret in addition to username and password. I guess that IPSec secret is pre-shared key that can be specified in crypto isakmp key on Cisco. But I could not find any VPN tutorials involving groups. Hence, my questions: How to add IPSec ID (group name) and IPSec secret on Cisco router for vpnc connections? Should I add a new crypto map matching all addresses as well? Is it possible to add this configuration without breaking the existing setup? Thank you.

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  • links for 2010-12-23

    - by Bob Rhubart
    Oracle VM Virtualbox 4.0 extension packs (Wim Coekaerts Blog) Wim Coekaerts describes the the new extension pack in Oracle VM Virtualbox 4.0 and how it's different from 3.2 and earlier releases. (tags: oracle otn virtualization virtualbox) Oracle Fusion Middleware Security: Creating OES SM instances on 64 bit systems "I've already opened a bug on this against OES 10gR3 CP5, but in case anyone else runs into it before it gets fixed I wanted to blog it too. (NOTE: CP5 is when official support was introduced for running OES on a 64 bit system with a 64 bit JVM)" - Chris Johnson (tags: oracle otn fusionmiddleware security) Oracle Enterprise Manager Grid Control: Shared loader directory, RAC and WebLogic Clustering "RAC is optional. Even the load balancer is optional. The feed from the agents also goes to the load balancer on a different port and it is routed to the available management server. In normal case, this is ok." - Porus Homi Havewala (tags: WebLogic oracle otn grid clustering) Magic Web Doctor: Thought Process on Upgrading WebLogic Server to 11g "Upgrading to new versions can be challenging task, but it's done for linear scalability, continuous enhanced availability, efficient manageability and automatic/dynamic infrastructure provisioning at a low cost." - Chintan Patel (tags: oracle otn weblogic upgrading) InfoQ: Using a Service Bus to Connect the Supply Chain Peter Paul van de Beek presents a case study of using a service bus in a supply channel connecting a wholesale supplier with hundreds of retailers, the overall context and challenges faced – including the integration of POS software coming from different software providers-, the solution chosen and its implementation, how it worked out and the lessons learned along the way. (tags: ping.fm) Oracle VM VirtualBox 4.0 is released! - The Fat Bloke Sings The Fat Bloke spreads the news and shares some screenshots.  (tags: oracle otn virtualization virtualbox) Leaks on Wikis: "Corporations...You're Next!" Oracle Desktop Virtualization Can Help. (Oracle's Virtualization Blog) "So what can you do to guard against these types of breaches where there is no outsider (or even insider) intrusion to detect per se, but rather someone with malicious intent is physically walking out the door with data that they are otherwise allowed to access in their daily work?" - Adam Hawley (tags: oracle otn virtualization security) OTN ArchBeat Podcast Guest Roster As the OTN ArchBeat Podcast enters its third year, it's time to acknowledge the invaluable contributions of the guests who have participated in ArchBeat programs. Check out this who's who of ArchBeat podcast panelists, with links to their respective interviews and more. (tags: oracle otn oracleace podcast archbeat) Show Notes: Architects in the Cloud (ArchBeat) Now available! Part 2 (of 4) of the ArchBeat interview with Stephen G. Bennett and Archie Reed, the authors of "Silver Clouds, Dark Linings: A Concise Guide to Cloud Computing." (tags: oracle otn podcast cloud) A Cautionary Tale About Multi-Source JNDI Configuration (Scott Nelson's Portal Productivity Ponderings) "I ran into this issue after reading that p13nDataSource and cgDataSource-NonXA should not be configured as multi-source. There were some issues changing them to use the basic JDBC connection string and when rolling back to the bad configuration the server went 'Boom.'" - Scott Nelson (tags: weblogic jdbc oracle jndi)

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  • To SYNC or not to SYNC – Part 4

    - by AshishRay
    This is Part 4 of a multi-part blog article where we are discussing various aspects of setting up Data Guard synchronous redo transport (SYNC). In Part 1 of this article, I debunked the myth that Data Guard SYNC is similar to a two-phase commit operation. In Part 2, I discussed the various ways that network latency may or may not impact a Data Guard SYNC configuration. In Part 3, I talked in details regarding why Data Guard SYNC is a good thing, and the distance implications you have to keep in mind. In this final article of the series, I will talk about how you can nicely complement Data Guard SYNC with the ability to failover in seconds. Wait - Did I Say “Seconds”? Did I just say that some customers do Data Guard failover in seconds? Yes, Virginia, there is a Santa Claus. Data Guard has an automatic failover capability, aptly called Fast-Start Failover. Initially available with Oracle Database 10g Release 2 for Data Guard SYNC transport mode (and enhanced in Oracle Database 11g to support Data Guard ASYNC transport mode), this capability, managed by Data Guard Broker, lets your Data Guard configuration automatically failover to a designated standby database. Yes, this means no human intervention is required to do the failover. This process is controlled by a low footprint Data Guard Broker client called Observer, which makes sure that the primary database and the designated standby database are behaving like good kids. If something bad were to happen to the primary database, the Observer, after a configurable threshold period, tells that standby, “Your time has come, you are the chosen one!” The standby dutifully follows the Observer directives by assuming the role of the new primary database. The DBA or the Sys Admin doesn’t need to be involved. And - in case you are following this discussion very closely, and are wondering … “Hmmm … what if the old primary is not really dead, but just network isolated from the Observer or the standby - won’t this lead to a split-brain situation?” The answer is No - It Doesn’t. With respect to why-it-doesn’t, I am sure there are some smart DBAs in the audience who can explain the technical reasons. Otherwise - that will be the material for a future blog post. So - this combination of SYNC and Fast-Start Failover is the nirvana of lights-out, integrated HA and DR, as practiced by some of our advanced customers. They have observed failover times (with no data loss) ranging from single-digit seconds to tens of seconds. With this, they support operations in industry verticals such as manufacturing, retail, telecom, Internet, etc. that have the most demanding availability requirements. One of our leading customers with massive cloud deployment initiatives tells us that they know about server failures only after Data Guard has automatically completed the failover process and the app is back up and running! Needless to mention, Data Guard Broker has the integration hooks for interfaces such as JDBC and OCI, or even for custom apps, to ensure the application gets automatically rerouted to the new primary database after the database level failover completes. Net Net? To sum up this multi-part blog article, Data Guard with SYNC redo transport mode, plus Fast-Start Failover, gives you the ideal triple-combo - that is, it gives you the assurance that for critical outages, you can failover your Oracle databases: very fast without human intervention, and without losing any data. In short, it takes the element of risk out of critical IT operations. It does require you to be more careful with your network and systems planning, but as far as HA is concerned, the benefits outweigh the investment costs. So, this is what we in the MAA Development Team believe in. What do you think? How has your deployment experience been? We look forward to hearing from you!

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  • How to tell Windows 7 to ignore a default gateway

    - by zildjohn01
    I currently have 2 network cards in my PC -- one connected to an internal network on a router with a disconnected WAN port (10.x.x.x), and one connected to the internet through a consumer router (192.168.0.x). Windows seems to recognize them correctly (my "Network and Sharing Center" lists them as "No Internet" and "Internet" respectively), however when I try browsing the internet it always tries the internal network's default gateway, rather than the one with internet access. Trying to ping a website results in "Reply from 10.0.0.1: Destination net unreachable.". A simple "route delete 0.0.0.0 mask 0.0.0.0 10.0.0.1" fixes the problems, but they return upon reboot, or upon renewing my IP. Is there any way to tell Windows to ignore one NIC's default gateway, or to at least give them priorities?

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  • Setting up a router as a DNS server only

    - by Jacob R
    I have a Linksys WRT54GL router that I don't need anymore, since I had to buy a 3G capable router (Dovado 3GN). As I only have a 3G connection at home, I want to optimize it as much as possible. I want to setup a caching DNS server, including some blacklisting of ad domains. The router currently runs the DD-WRT firmware. Is it possible to use this router as an ordinary computer, running only a DNS server, disabling all other features such as DHCP, WLAN, etc? Connecting it to my other router, should I simply run a cable into the WAN-port of the Linksys router?

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  • VPN: What should my Gateway remote ID be?

    - by Lynn Owens
    I have a Netgear ProSafe UTM. I set the Gateway local ID to it's WAN IP. But I'm not sure what to put for it's Remote ID. I want to be able to connect to it from a laptop across the internet. I can chose between: Remote IP FQDN Client FQDN Cert DN Frankly I've tried them messing around with them all but I'm just shooting in the dark, and the help desk docs are worthless. Also, Googling around seems to end up with lots of pages not really related to what I want. A lot of pages on configuring Cisco or Windows home networking or privacy advocates.

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  • WebCenter Customer Spotlight: Textron Inc.

    - by me
    Author: Peter Reiser - Social Business Evangelist, Oracle WebCenter  Solution SummaryTextron Inc. is one of the world's best known multi-industry companies and is a pioneer of the diversified business model. Founded in 1923, it has grown into a network of businesses—including Bell Helicopter, E-Z-GO, Cessna, and Jacobsen—with facilities and a presence in 25 countries, serving a diverse and global customer base. Textron is ranked 236th on the Fortune 500 list of the largest US companies. Textron needed a Web experience management solution to centralize control, minimize costs, and enable more efficient operations. Specifically, the company wanted to take IT out of the picture as much as possible, enabling sales and marketing leads for subsidiaries to make Website updates as they deem appropriate for their business.   Textron worked with Oracle partner Element Solutions to consolidate its Website management systems onto Oracle WebCenter Sites. The implementation enables Textron’s subsidiaries to adjust more quickly to customer demands,  reduced Website management cost & time to update content on a Website while allowing to integrate its Website updates more closely with social media and mobile platforms. Company OverviewTextron Inc. is one of the world's best known multi-industry companies and is a pioneer of the diversified business model. Founded in 1923, it has grown into a network of businesses—including Bell Helicopter, E-Z-GO, Cessna, and Jacobsen—with facilities and a presence in 25 countries, serving a diverse and global customer base. Textron is ranked 236th on the Fortune 500 list of the largest US companies. Business ChallengesWith numerous subsidiaries and more than 50 public Websites, Textron needed a Web experience management solution to centralize control, minimize costs, and enable more efficient operations. Specifically, the company wanted to take IT out of the picture as much as possible, enabling sales and marketing leads for subsidiaries to make Website updates as they deem appropriate for their business.   Solution DeployedTextron worked with Oracle partner Element Solutions to consolidate its Website management systems onto Oracle WebCenter Sites. Specifically, Textron: Used Oracle WebCenter Sites to integrate Web experience management capabilities for all Textron brands, including Bell Helicopter, E-Z-GO, Cessna, and Jacobsen Developed Website templates to enable marketing and communications professionals to easily make updates to their Websites, without having to work with IT Reduced Website management costs, as it costs more for IT to coordinate Website updates as opposed to marketing and communications Enabled IT to concentrate on other activities to enhance overall operations for Textron, such as project workflows Acquired a platform that enables marketing teams to integrate their Websites with social media and mobile platforms, allowing subsidiaries to make updates and contact customers anytime and everywhere—including through tablets and smartphones Reduced the time it takes to update content on a Website, including press releases, by enabling communications professionals to make updates directly Developed more appealing visual designs for Websites to help enhance customer purchase Business ResultsThe implementation enabled Textron’s subsidiaries to adjust more quickly to customer demands and Textron’s IT staff to concentrate on other processes, such as writing code and developing new workflows, enabling them to enhance company processes. In addition, Textron can use Oracle WebCenter Sites to integrate its Website updates more closely with social media and mobile platforms, enabling marketing and communications teams to make updates anytime and everywhere. The initiative has enabled Textron to save money by freeing IT up to work on more important tasks, instituting new e-commerce and mobile initiatives to better engage customers, and by ensuring efficient Website management processes to quickly adjust to customer demands.  “We considered a number of products, but chose Oracle WebCenter Sites because it provides the best user interface. We reviewed customer references and analyst reports, and Oracle WebCenter Sites was consistently at the top of the list,” Brad Hof, Manager, Advanced Business Solutions and Web Communications, Textron Inc. Additional Information Tectron Inc. Customer Snapshot Oracle WebCenter Sites

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  • Monitoring bandwidth/latency/jitter between 2 sites?

    - by TheCleaner
    I have 2 sites connected via an MPLS network and I'd like to do the following: setup a host on each end that can "talk" back and forth between each other and somehow report/log what kind of throughput, jitter, latency, etc. they are experiencing between each other in 5 minute intervals. Something similar to Qcheck but that can be automated. Bottom line is I'm trying to determine if the WAN network is "stable" throughout the day or if something is wrong. We have video conferences between these sites and even at 1024kbps calls we are experiencing delays and jitter. I'm hoping to exonerate the network with some testing.

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  • My D-Link's Ethernet bridge downlink just got 10-30x slower?

    - by Jay Levitt
    TL;DR: I unplugged my network to move my desk, and now downloading via my DIR-655's Ethernet LAN bridge is 10-30x slower than the Ethernet switch it's plugged into. Background My network is SMC cable modem <-> Cisco firewall <-> Netgear switch <-> D-Link WiFi† | | | | SMC8014 ASA-5505 GS608v2 gigE DIR-655 rev A3 gigE †The DIR-655 is used as an access point, not a router (although what D-Link calls an access point, I'd call a bridge). The "WAN" port is unused; the Netgear connects to the built-in 4-port Ethernet LAN switch, inside the built- in router/firewall. Endpoints: MacBook Pro 17" mid-2010 iPhone 4S Fedora 12 Linux server running reasonably fast dual-Athlon X2, VelociRaptors, etc. All cables are <10 feet, mostly CAT-5e, some CAT-6, all premade. All WiFi endpoints are within three feet of the D-Link. Yesterday I unplugged and rearranged stuff, and now connecting via the D-Link - even through the wired switch, right next to the incoming network cable - is 30x slower than connecting directly to the Netgear switch, on both my MacBook and iPhone. How I'm measuring "slower" I'm mostly using http://speedtest.net, which of course only really measures broadband speeds. I've also installed http://www.speedtest.net/mini.php on my local server, but can't test the iPhone with that. Results Speedtest.net, closest server over Comcast business-class: CONFIG | PING (ms) | DOWN (Mbps) | UP (Mbps) Mac <-> Ethernet <-> Netgear | 9 | 31.6 | 6.8 Mac <-> Ethernet <-> D-Link | 8 | 4.1 | 6.0 Mac <-> WiFi <-> D-Link | 9 | 1.4 | 2.9 iPhone <-> WiFi <-> D-Link | 67 | 0.4 | 1.6 Speedtest Mini on Linux PC: CONFIG | DOWN (Mbps) | UP (Mbps) Mac <-> Ethernet <-> NetGear | 97.2 | 76.9 Mac <-> Ethernet <-> D-Link | 8.2 | 24.2 Mac <-> WiFi <-> D-Link | 1.0 | 8.6 Slow typing in SSH: Mac <-> Ethernet <-> Netgear <-> Linux PC: smooth Mac <-> Ethernet <-> D-Link <-> Linux PC: choppy Note that D-Link upload speeds are normal on broadband, slower locally (but I'd believe that's a D-Link limitation), and always faster than the downloads! Since ssh is choppy just with slow typing, I don't believe it's a throttling-type problem either; that's not a lot of bandwidth. What I've tried Swapping all "good" and "bad" cables Re-plugging "bad" cable from D-Link to Netgear and watching it be the "good" cable pulling cables away from power lines Verify that the Mac auto-detects the D-Link as gigE Try to verify the link speed of the D-Link <- Netgear connection, but the firmware doesn't report that Verify that the D-Link sees no TX/RX errors or collisions Use different Ethernet ports on both Netgear and D-Link Reset the D-Link to factory settings Upgrade the D-Link firmware from 1.21 to 1.35NA, 2010/11/12, the latest Reboot everything at least once On the Mac, disable Wi-Fi during the Ethernet tests, and unplug Ethernet during the Wi-Fi tests Using iStumbler, verify that the D-Link isn't picking overloaded Wi-Fi channels (usually just 1-5 neighbors on my and adjacent channels, average for my apt building) Verify that the only client connected to the Wi-Fi was the iPhone Verify that nothing was being chatty on my network according to the WISH log Enable and disable all sorts of D-Link settings, including forcing WAN auto-detect to gigE So. I don't mind buying a new access point—I wouldn't mind having a dual-link network—but as a guy who's been networking since gated v4 was a drastic rewrite, and who often used physical sniffers in the days before Wireshark, I'm baffled. I hate being baffled. What could I possibly have changed that would result in this? How can I measure it? All I can think of is a static zap—thick carpet, socks, HVAC—but I didn't feel one, and does that really happen anymore? Can I test if it's Ethernet vs. TCP layer slowness? I'm not familiar with modern network utilities; it's hard to Google without hitting "Q: Why is my network slow? A: Is your microwave on?" If I don't get an answer here, will someone big and powerful help me migrate it to serverfault without getting screamed back here? In the words of Inigo Montoya, "I must know." Don't get all Dread Pirate Roberts on me.

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  • Setting up a router as a DNS server only

    - by Jacob R
    I have a Linksys WRT54GL router that I don't need anymore, since I had to buy a 3G capable router (Dovado 3GN). As I only have a 3G connection at home, I want to optimize it as much as possible. I want to setup a caching DNS server, including some blacklisting of ad domains. The router currently runs the DD-WRT firmware. Is it possible to use this router as an ordinary computer, running only a DNS server, disabling all other features such as DHCP, WLAN, etc? Connecting it to my other router, should I simply run a cable into the WAN-port of the Linksys router?

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  • Remote connection to dynamic public ip & private ip addresses

    - by user53864
    Many times I connected to windows computer which has static public ip address via remote desktop over wan links. I'm wondering how could I connect to the remote computer that has dynamic public ip address & private ip addresses assigned. I've 2 systems at home: xp system-------connected to internet(dynamic public ip) & allowed other users to connected to the internet on the interface. windows vista system--------enabled dhcp on the interface to access internet from xp. How could I remotely connect from my office to the 'vista system'?. If I've a router/modem at my home it may be possible to allow the ports for the system but I don't. Any tips?

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  • Urgent SSH Local Port Redirection

    - by Salina Odelva
    Hi, everyone. I have a shell account but the admin has restricted ssh access to the server. The server is listening on 0.0.0.0:22 but the firewall blocks any incoming attempts to this port. He says he is doing maintenance but I don't believe him and I need to backup my stuff with ssh. My question is that: Is it possible to do this: Me (Wan IP) <- Hosting Server (tcp/8080) redirects to Hosting Server (tcp/22) I don't want to involve my own linux machine in this and I can only make use of ssh.. Thanks!!

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  • ArchBeat Link-o-Rama Top 10 for November 2012

    - by Bob Rhubart
    Every day ArchBeat searches the web for content created by and for community members, and then shares that content via social media. Here's the list of the Top 10 most popular items posted on the OTN ArchBeat Facebook Page for November 2012. One-Stop Shop for Oracle Webcasts Webcasts can be a great way to get information about Oracle products without having to go cross-eyed reading yet another document off your computer screen. Oracle's new Webcast Center offers selectable filtering to make it easy to get to the information you want. Yes, you have to register to gain access, but that process is quick, and with over 200 webcasts to choose from you know you'll find useful content. OAM/OVD JVM Tuning Vinay from the Oracle Fusion Middleware Architecture Group (otherwise known as the A-Team) shares a process for analyzing and improving performance in Oracle Virtual Directory and Oracle Access Manager. White Paper: Oracle Exalogic Elastic Cloud: Advanced I/O Virtualization Architecture for Consolidating High-Performance Workloads This new white paper by Adam Hawley (with contributions from Yoav Eilat) describes in great detail the incorporation into Oracle Exalogic of virtualized InfiniBand I/O interconnects using Single Root I/O Virtualization (SR-IOV) technology. Architected Systems: "If you don't develop an architecture, you will get one anyway..." "Can you build a system without taking care of architecture?," asks Manuel Ricca. "You certainly can. But inevitably the system will be unbalanced, neglecting the interests of key stakeholders, and problems will soon emerge." Backup and Recovery of an Exalogic vServer via rsync "On Exalogic a vServer will consist of a number of resources from the underlying machine," says the man known only as Donald. "These resources include compute power, networking and storage. In order to recover a vServer from a failure in the underlying rack all of these components have to be thoughts about. This article only discusses the backup and recovery strategies that apply to the storage system of a vServer." This Week on the OTN Architect Community Home Page Make time to check out this week's features on the OTN Solution Architect Homepage, including: SOA Practitioner Guide: Identifying and Discovering Services Technical article by Yuli Vasiliev on Setting Up, Configuring, and Using an Oracle WebLogic Server Cluster Podcast: Are You Future Proof? Clustering ODI11g for High-Availability Part 1: Introduction and Architecture | Richard Yeardley "JEE agents can be deployed alongside, or instead of, standalone agents," says Rittman Meade's Richard Yeardley. "But there is one key advantage in using JEE agents and WebLogic – when you deploy JEE agents as part of a WebLogic cluster they can be configured together to form a high availability cluster." Learn more in Yeardley's extensive post. OIM 11g : Multi-thread approach for writing custom scheduled job | Saravanan V S Saravanan shares insight and expertise relevant to "designing and developing an OIM schedule job that uses multi threaded approach for updating data in OIM using APIs." How to Create Virtual Directory in Weblogic Server | Zeeshan Baig Oracle ACE Zeeshan Baig shows you how in six easy steps. SOA Galore: New Books for Technical Eyes Only Shake up up your technical skills with this trio of new technical books from community members covering SOA and BPM. Thought for the Day "Humans are the best value in computers -- where else can you get a non-linear computer weighing only about 160lbs, having a billion binary decision elements, that can be mass-produced by unskilled labour?" — Anonymous Source: SoftwareQuotes.com

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  • Sonicwall Enhanced With One-To-One NAT, Firewall Blocking Everything

    - by Justin
    Hello, just migrated from a Sonicwall TZ180 (Standard) to a Sonicwall TZ200 (Enhanced). Everything is working except the firewall rules are blocking everything. All hosts are online, and being assigned correct ip addresses. I can browse the internet on the hosts. I am using one-to-one NAT translating public ip addresses to private. 64.87.28.98 -> 192.168.1.2 64.87.28.99 -> 192.168.1.3 etc First order of business is to get ping working. My rule is in the new firewall is (FROM WAN to LAN): SOURCE DESTINATION SERVICE ACTION USERS ANY 192.168.1.2-192.168.1.6 PING ALLOW ALL This should be working, but not. I even tried changing the destination to the public ip addresses, but still no luck. SOURCE DESTINATION SERVICE ACTION USERS ANY 64.87.28.98-64.87.28.106 PING ALLOW ALL Any ideas what I am doing wrong?

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  • routing traffic between two network cards through firewall

    - by RubyFreak
    I'm trying to test a network device (firewall) using a Linux box, with two network cards, one interface connected to the WAN zone and another interface to LAN zone. The configuration is similar with that |ETH0| <-> | FW | <-> ETH1 So from both interfaces I'm able to ping the respective firewall interface. But i'm not able to fire something like: ping -I eth0 ip.from.eth1 and to get any answer. Is that possible or should the linux network namespace solution or user level tcp stacks (VMs are out of question)

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  • Port based bandwidth shaping

    - by nixnotwin
    I have an interent connection with the speed of 4000k bits up and down. I want to do port based traffic shaping on a ubuntu machine, which acts as router. eth0 is the WAN interface. This is how I would like to allocate bandwidth: For ports 80 and 445 the bandwidth usage can go upto 90% For ports above 1024 upto 65535 the bandwidth usage can go upto 10% For remaining ports the bandwidth usage can go upto 40% The easiest way for achieving the above is using a router with tomato firmware. I have used it and it is very efficient. I want to try if it can be done on a Ubuntu or any GNU/Linux machine. I have googled extensively about the topic and I feel there isn't much information.

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