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• Neighbour table overflow on Linux hosts related to bridging and ipv6

  - by tim

  Note: I already have a workaround for this problem (as described below) so this is only a "want-to-know" question. I have a productive setup with around 50 hosts including blades running xen 4 and equallogics providing iscsi. All xen dom0s are almost plain Debian 5. The setup includes several bridges on every dom0 to support xen bridged networking. In total there are between 5 and 12 bridges on each dom0 servicing one vlan each. None of the hosts has routing enabled. At one point in time we moved one of the machines to a new hardware including a raid controller and so we installed an upstream 3.0.22/x86_64 kernel with xen patches. All other machines run debian xen-dom0-kernel. Since then we noticed on all hosts in the setup the following errors every ~2 minutes: [55888.881994] __ratelimit: 908 callbacks suppressed [55888.882221] Neighbour table overflow. [55888.882476] Neighbour table overflow. [55888.882732] Neighbour table overflow. [55888.883050] Neighbour table overflow. [55888.883307] Neighbour table overflow. [55888.883562] Neighbour table overflow. [55888.883859] Neighbour table overflow. [55888.884118] Neighbour table overflow. [55888.884373] Neighbour table overflow. [55888.884666] Neighbour table overflow. The arp table (arp -n) never showed more than around 20 entries on every machine. We tried the obvious tweaks and raised the /proc/sys/net/ipv4/neigh/default/gc_thresh* values. FInally to 16384 entries but no effect. Not even the interval of ~2 minutes changed which lead me to the conclusion that this is totally unrelated. tcpdump showed no uncommon ipv4 traffic on any interface. The only interesting finding from tcpdump were ipv6 packets bursting in like: 14:33:13.137668 IP6 fe80::216:3eff:fe1d:9d01 > ff02::1:ff1d:9d01: HBH ICMP6, multicast listener reportmax resp delay: 0 addr: ff02::1:ff1d:9d01, length 24 14:33:13.138061 IP6 fe80::216:3eff:fe1d:a8c1 > ff02::1:ff1d:a8c1: HBH ICMP6, multicast listener reportmax resp delay: 0 addr: ff02::1:ff1d:a8c1, length 24 14:33:13.138619 IP6 fe80::216:3eff:fe1d:bf81 > ff02::1:ff1d:bf81: HBH ICMP6, multicast listener reportmax resp delay: 0 addr: ff02::1:ff1d:bf81, length 24 14:33:13.138974 IP6 fe80::216:3eff:fe1d:eb41 > ff02::1:ff1d:eb41: HBH ICMP6, multicast listener reportmax resp delay: 0 addr: ff02::1:ff1d:eb41, length 24 which placed the idea in my mind that the problem maybe related to ipv6, since we have no ipv6 services in this setup. The only other hint was the coincidence of the host upgrade with the beginning of the problems. I powered down the host in question and the errors were gone. Then I subsequently took down the bridges on the host and when i took down (ifconfig down) one particularly bridge: br-vlan2159 Link encap:Ethernet HWaddr 00:26:b9:fb:16:2c inet6 addr: fe80::226:b9ff:fefb:162c/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:120 errors:0 dropped:0 overruns:0 frame:0 TX packets:9 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:5286 (5.1 KiB) TX bytes:726 (726.0 B) eth0.2159 Link encap:Ethernet HWaddr 00:26:b9:fb:16:2c inet6 addr: fe80::226:b9ff:fefb:162c/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1801 errors:0 dropped:0 overruns:0 frame:0 TX packets:20 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:126228 (123.2 KiB) TX bytes:1464 (1.4 KiB) bridge name bridge id STP enabled interfaces ... br-vlan2158 8000.0026b9fb162c no eth0.2158 br-vlan2159 8000.0026b9fb162c no eth0.2159 The errors went away again. As you can see the bridge holds no ipv4 address and it's only member is eth0.2159 so no traffic should cross it. Bridge and interface .2159 / .2157 / .2158 which are in all aspects identical apart from the vlan they are connected to had no effect when taken down. Now I disabled ipv6 on the entire host via sysctl net.ipv6.conf.all.disable_ipv6 and rebooted. After this even with bridge br-vlan2159 enabled no errors occur. Any ideas are welcome.

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• Plink/Putty fail on return

  - by jasemccarty

  Any one have any idea why a remote command to a NetApp filer would fail when using Plink/Putty (to execute a command) across 2 networks? Everything is open both ways (multiple firewalls), but the filer seems to be responding from port 22 to some random port. So my Windows box on the other side doesn't know to answer because the target port isn't 22. Any thoughts?

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• How can I connect to weblogic JMX via an SSH tunnel?

  - by Zubair

  I am trying to connect to weblogic via an SSH tunnel. When I connect to the web interface it works fine, but when I try to connect via JMX I get the message: javax.naming.CommunicationException [Root exception is java.net.ConnectException: t3://127.0.0.1:7001: Bootstrap to 127.0.0.1/127.0.0.1:7001 failed. It is likely that the remote side declared peer gone on this JVM] Does anyone know what this means?

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• Clean up windows update backup and install files

  - by John Oxley

  I have a Server 2003 box. I've noticed the windows directory is 4 gigs and I guess that's primarily windows updates. As a side not, it would be cool to do this on my XP boxes if possible.

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• Cannot access website from inside network

  - by musclez

  I have a website running from my internal network available at the example IP 192.168.1.5. When I type this in to the browser, it redirects to my domain name ie, "example.com", and gives me Error code: ERR_CONNECTION_REFUSED. Any other machine that is inside of the network can access the website. The website is also accessible outside of the network. Other services from the server, like file sharing or ftp, are available to all machines in the network including the one i'm having issues http issues with. The issue may be linked to a proxy service, but from my understanding the service has been completely disabled and any executable have been uninstalled from the machine. I am wondering if there is some residual proxy information remaining on the machine that limits the connection. I'm fairly positive that "example.com" is what is being blocked by the local machine, and not an IP address being blocked or a faulty connection. When I examine the hosts file, there are no redirects to the local machine for "example.com". There was a rule, as on my other machines within the network: 192.168.1.5 example.com But i have since removed that for troubleshooting purposes. What intrigued me is that when I use the actual IP, the IP address will redirect to the domain in the browser and THEN say ERR_CONNECTION_REFUSED. Server-Side Results The server logs are reporting this: example.com ::1 - - [Date & time] "OPTIONS * HTTP/1.0" 200 126 "-" "Apache/2. 2.22 (Unix) (internal dummy connection)" However, this seems to be irrelevant as it is not triggered when I try to connect to the server with the specified machine. Fiddler results: Host: *example.com* Proxy-Connection: keep-alive Chrome-Side [Fiddler] The connection to 'example.com' failed. Error: ConnectionRefused (0x274d). System.Net.Sockets. SocketException No connection could be made because the target machine actively refused it 01.23.45.67:80 01.23.45.67:80 would be the external IP, which the server and the machine in question both share. I am doing so reading into 0x274d and its coming back with .NET web.config information. I am still at a loss to what to do with this information. I have WireShark running as well. Theres is a lot of sensitive information in the readout and I'm not sure what to extract from it. Either way, if it helps, I can access that information if anyone would like me to. Thanks for the help!

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• Motherboard Is A MCP61PM-HM Rev 1.OB

  - by Dennis Smith

  I have a compaq presario pc SR5110NX The Processor is AMD Athlon 64 Proceessor3800+ It has 512 mb of Ram and a 40gb Hard Drive Here is my problem I Have 2 Sata One Is Black and the other Is White I have 2 red little cables and they have the letters and numbers on them It Is HP P/N:5188-2897 0720 on the side of the cable.Here is the Mother Board MCP61PM-HM Rev 1.0B I need to now where do the two Sata Connectors Connect Too Please Help Thank You So Much.Ps I am running windows XP Pro

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• Matching monitors

  - by JC

  Does anyone know a good matching monitor setup for multiple displays? Looking for 1920 x 1200 with IPS panel as the main screen and some 1600 x 1200 monitor for the side but no single manufacturer seems to make monitors that match like this. Do you all just deal with the resolution and size differences in multi setups or has anyone found decent IPS panel setups that match (size / vertical resolution)? Three 1920x1200 seems like overkill, that's why I was looking for 4:3 monitors for the sides.

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• Dynamically hosting new domains on Apache

  - by Kunal

  I'd like to dynamically be able to host client's domains, with just having to provide them instructions like this: http://www.tumblr.com/docs/en/custom_domains I'm running a pretty typical LAMP stack; any good tutorials for configuring this for Apache, or other server-side configurations I need to be aware of?

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• Encrypting traffic on remote end of SSH tunnel

  - by Aaron

  Using an example of someone connecting to a VPS, an SSH tunnel will encrypt any traffic coming from the user to the VPS. Once it reaches the VPS network, the traffic is not encrypted and is easily sniffable by network administrators on that particular network. (am I understanding all that correctly?) Is there a way to have the traffic encrypted on both ends so that neither side is susceptible to packet sniffing to reveal what kind of data/traffic/protocol is being transmitted?

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• How to tell credentials used for a Network Mapping?

  - by shanecourtrille

  I have a networking mapping that doesn't appear to work. When I connect to the mapping I get access denied when I try to create a folder. When I created the mapping I told it to login as another account. I have verified that account has the proper rights on the server side of things. How can I verify that my local machine is connecting with the right credentials?

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• Custom Windows hotkey to refresh browser window

  - by Prez

  I work in a double screen environment where I write code on one screen and preview the results in the other (containing Firefox, Chrome etc.). It would be great if I could somehow make the browser window refresh without manually switching to the browser. So while I write code, I would like to push, for example, Ctrl+Alt+R and the browser window would refresh without any extra effort on my side. Is there any software that could help me to set up such custom hotkey?

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• Networking: Adding specific route for printer, on Mac Connected to Two Networks

  - by Jordan

  I have a Mac connected to two different networks (wireless en1 and ethernet en0 ). The ethernet network is the preferred (System Preferences-Set Service Order). I'd like to be able to print to a printer on the wireless network side, without having to go to System Preferences and make the wireless network come first in the service order. Is there a way to add a route for a specific printer?

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• Macbook pro 1,1 wifi problems

  - by Giulio

  I have a macbook pro 1,1 that has problems with the wifi: i have a strong wireless router that reaches the far side of my house, but with my macbook pro, i have to stay within 1 meter away from the router to have internet connection. if i step out of that range, i lose connection. now, my questions are: 1)what the hell i going on 2) is there a way to fix this?

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• 503 service unavailable debugging PHP files

  - by user25932

  I have a web server with apache 2.0 installed. It comes with Zend Server install pack. When I’m trying to debug my php files apache serves a blank page with 503 service unavailable. Of course slow server-side code is tying up Apache requests for far too long, but I need it to wait, until my debugging comes to end. How can I solve this problem.

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• Disabling "is typing a message" in MSN Messenger on Mac

  - by waiwai933

  Is there a way to disable the [User] is typing a message notification on the side of the person's who's typing in MSN Messenger on a Mac?

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• Send HD video over SONET

  - by Fizzy

  In an effort to test our new OC 192 network, we would like to find a way to stream HD video over it for a demonstration. We are looking for a device or combination of devices that connects to HDMI on one side and has a XFP client interface on the other. I understand this is a ridiculous request and we are planning on an "interesting" solution.

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• Secure communication between Oracle client and server

  - by Santhosha Kaldambe

  As per project requirement i need to to secure communication between Oracle server and client. I have oracle version 11g. What are the configuration steps i need to follow in the client and server side for attaining secure communication What if i want to do this secure communication using Programming. What is the syntax i need to follow?

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• Can admin edit a user’s “Manage Account Access” (ical)

  - by Louis W

  As a server administrator, can I edit a user's "Manage Account Access" settings. This is where a user sets who can see their calendar. Whenever we add a new user, we have to go to every person's computer and add the new user's account to this. It would be great if I could do this server side.

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• Disable laptop CD-ROM drive

  - by Stan

  Since I seldom use the built-in cd-rom, but usually carelessly press open door button which is on the side of laptop. Is there any way to power off cd-rom so the button won't work. Better not to open the back lid and unplug power cable.

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• Which Boot Camp driver version am I running?

  - by tinmaru

  I installed Boot Camp on my Mac, then Windows 7 and the specific Windows drivers from the Mac OS X installation DVD. On the Windows side, how can I know which version of the Boot Camp driver I am running?

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• Redirect Using htaccess

  - by manyxcxi

  I am trying to redirect /folder to / using .htaccess but all am I getting is the Apache HTTP Server Test Page. My root directory looks like this: / .htaccess -/folder -/folder2 -/folder3 My .htaccess looks like this: RewriteEngine On RewriteCond %{REQUEST_URI} !^/folder/ RewriteRule (.*) /folder/$1 What am I doing wrong? I checked my httpd.conf (I'm running Centos) and the mod_rewrite library is being loaded. As a side note, my server is not a www server, it's simply a virtual machine so it's hostname is centosvm.

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• How to force iscsi initiator to login only once

  - by Disco

  Trying to setup a few CentOS nodes to connect to a Dell MD3600i array, i'm running into the issue that the MD3600i shows 4 different portals (with different IP addresses) and when i launch the initiator on host side well, it connects to every IP address it has seen during the discovery phase; resulting in duplicates. How can I 'force' the initiator to discard every other IP and let me choose only one IP portal to connect to ? Must be damn stupid but I can't figure out how. Thx

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• NFS server is ignoring anonuid?

  - by paszczak000

  On NFS server I've got user with UID=1024 and GID=1204. On client side too. Both servers are CentOS 6.4 (2.6.32-358.2.1.el6.x86_64). Right now anonuid/anongid is not working. Files aren't mapped to 1024 uid but to 99 (nobody:x:99:99:Nobody:/:/sbin/nologin). /etc/exports /vol/test10.xxx.xxx.xxx(rw,all_squash,anonuid=1024,anongid=1024) /etc/fstab 10.xxx.xxx.xxx:/vol/test /nas/test nfs nosuid,intr,defaults,_netdev,intr 0 0

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• Web hosting colo stack, what do i need

  - by james

  I'm looking to colocate a website, obviously running a few apache servers, mysql cluster, SAN servers and load balancer. What else do I need to protect the servers and what would be the best method for DNS as all the web side of things will be in the colo centre and email hosted with another company? Thanks in advance

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• Experience in migrating from Apache to nginx?

  - by Julien

  I'd like to get some feedback about a migration From Apache to nginx. My goal is to reduce the memory footprint of the web server. Currently, I use the following modules.features on Apache: multiple virtual hosts Server Side Include Fast CGI Please share your experience: problems during migration, benefits after migration (was it worth it?), useful modules for nginx, etc.

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