Weird networking issue with Xen VM

[JohnH]

This is most likely not at all cpanel related but wanted to see someone has seen this weird behavior before.

We are currently running cpanel on CloudLinux 5.9 and Xen VM. We have about 30 IP addresses assigned to it. Weird thing is that about 5 of those 30 IP addresses just randomly drop from the VM and we have to restart the network interface for those 5 IPs every time it does.

The DC swears this is a configuration issue on the VM saying if this was a network issue, we would see all 30 IPs drop instead of just 5.

Does anyone know what steps I can take to start troubleshooting this? Have checked all the standard server logs and not seeing any logging going on that relates to the network dropping.

Thanks in advance

 

[cPanelMichael]

Hello

Do you have the NetworkManager package installed on this VPS? It's not required, and sometimes can cause conflicts with the IP addresses added to the server. If not, do you notice any entries for these IP addresses in the /var/log/messages log file? EX:

grep IP /var/log/messages

Thank you.

 

[JohnH]

Hi Michael,

Thanks for your response!

Looks like NetworkManager is indeed installed.

[root@cpanel ~]# yum list | grep -i network
NetworkManager.x86_64 1:0.7.0-13.el5 installed
NetworkManager-glib.x86_64 1:0.7.0-13.el5 installed

So I should go ahead and remove this?

Nothing in /var/log/messages for the IP that keep dropping.

 

[JohnH]

I just uninstalled NetworkManager and two of the IPs dropped. Interesting.

Michael, hopefully you just fixed this for me.

I'll do some research on this to see if I can make out why this could have potentially caused a problem.

Much appreciated!