[rhos-list] EXTERNAL: Re: Red Hat Linux VM freezes.

[Minton, Rich]

This is interesting...

We were able to resolve (or band aid) our problem by setting the VMs eth0 MTU to 1000.

Has anyone else encountered this problem? Any ideas why this is happening?

Rick

-----Original Message-----
From: Brent Eagles [mailto:beagles at redhat.com] 
Sent: Friday, May 24, 2013 5:58 PM
To: Minton, Rich
Cc: rhos-list at redhat.com
Subject: Re: EXTERNAL: Re: [rhos-list] Red Hat Linux VM freezes.

Hi,

On 05/24/2013 07:06 PM, Minton, Rich wrote:
> Rolling back the kernel and libvirt broke everything and I had reinstall the latest versions.

Yes, that is not surprising. I probably should have been more clear that would not be a good thing to do. "Normal" quantum functionality depends on the network namespaces feature so compromising that would only complicate things.

>  It looks like it might be a routing problem. Our quantum router
gateway IP is the same as our physical router IP and we think they are fighting over each other. I'll get my network engineer to look at it on Monday.
>
> I'll let you know the outcome.
>
> Rick

I don't know if it will have any affect whatsover, but you might consider changing the sysctl variable "net.ipv4.conf.default.rp_filter" 
to 0 (it is 1 by default in RHEL). I doubt whether it will change things here, but when "routing" comes up in multi-interface environment, I always give it a shot.

Cheers,

Brent