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Network vanishes

Mario Mieldijk



We have been using XenServer 6 for a while and it seems customers are informing us that the network is no longer accessible for VM hosted in it. Strangely, the other VMs work fine at that time. This doesnt happen on any particular VM but happens on different VMs time to time. The XenServer network also works fine.

The problem: After login in to the console of the guest OS, we see that the ip is still configured and the guest system can see the virtual NIC and the IP is UP according to ifconfig but its not pingable. I cant even ping to the assigned IP from the guest host console. If i remove the network card from the interface and plug it back into the guest machine, it works fine. The only error message we get is

root@HOST:~# ping
PING ( 56(84) bytes of data.
ping: sendmsg: No buffer space available
ping: sendmsg: No buffer space available
ping: sendmsg: No buffer space available
ping: sendmsg: No buffer space available
ping: sendmsg: No buffer space available

Specs: Xenserver 6 - applied patches - XS602E001, XS602E002, XS602E003
Guest OS - Ubuntu 10.0.4
Memory assigned is 5GB and 4 VCPUs

Thanks for all the help

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Hey all,


Any news regarding this matter? We got the same problem. "No buffer space available" from inside the VM if you try to ping, VM is not reachable from outside, access via console works fine. Deactivate > activate Virtual Network Interface via XenConsole solves the problem temporarly. This problem doesnt hit ALL VM's on a server, but only one or two at random.


Specs: XenServer release 5.6.100-46766p (xenenterprise)

Patches: XS56EFP1004, XS56EFP1005, XS56EFP1006, XS56ESP2, XS56EFP1001


No log-entry's with uuid of the vif, except VIF.unplug > VIF.plug, obviously.


And yeah, we know its an old release, dont ask why... I just wrote here, because this problems seems to be valid also in Xenserver 6.2

Maybe this is a known bug and there is a patch/release addressing this issue?



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We're having the same problem on an older box running XenServer 6.2.  The guest OS is Debian Wheezy, and the following updates have been applied:




Both the XenServer host and the VM have been up for 469 days.  Other VMs on this host running Debian Wheezy using the same network are not impacted.  Most of our infrastructure was migrated to XenServer 6.5 a long time ago, but I would still be curious to know whether this bug was ever fixed, as it could be lingering in future versions.

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I can confirm that I have never seen this on XS 7 but I have the issue with a Netscaler 12.0 on Citrix Hypervisor 8.0 wit Hotfixes 1-4 installed. Seems somehow the issue managed to be back.

Additionally I had running the 2 Netscaler VMs on one host for about 5 weeks without anything happening. After I moved one to another Host it started to happen every day. Since it is my secondary node I let it run there for troubleshooting purposes, but It is very annoying.

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