I think you'll need to do policy routing to ensure that packets received on
one IP address get returned via the same IP address. Here's some docs on
setting it up:

http://lartc.org/howto/lartc.rpdb.multiple-links.html
http://linux-ip.net/html/tools-ip-route.html

We've used this to solve the case of having two separate, but overlapping,
private networks (don't ask).

Skylar

On Wed, Jul 22, 2015 at 10:43 AM, Ski Kacoroski <[email protected]> wrote:

> Hi,
>
> I hvae a linux webserver that has a primary IP (no web config on it) and
> 10 other IPs assigned to it (one for each web site).  It also mounts a
> backup directory from an EMC VNX via NFS.  The EMC exports has the name of
> the server in it (machine.nsd.org).  It worked fine until we failed over
> to our DR site.
>
> What happened after the failover is that the NFS started using one of the
> webserver IPs.  I figured this out by doing a tcpdump on the webserver.
> The fix was to add the website name to the export list and it works fine.
>
> My question is why would it pick a different IP?  Is there something I can
> do to force NFS to always use the same IP instead of randomly picking one
> from the 11 IPs that are assigned to the machine?
>
> Thanks,
>
> ski
>
> --
> "When we try to pick out anything by itself, we find it
>   connected to the entire universe"            John Muir
>
> Chris "Ski" Kacoroski, [email protected], 206-501-9803
> or ski98033 on most IM services
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