Network loss

[Johan Kooijman]

Hi all,

I have a weird situation here where I can't get my head around.

One FreeBSD 9.2-STABLE ZFS/NFS box, multiple Linux clients. Once in a while
the Linux clients loose their NFS connection:

Feb 25 06:24:09 hv3 kernel: nfs: server 10.0.24.1 not responding, timed out

Not all boxes, just one out of the cluster. The weird part is that when I
try to ping a Linux client from the FreeBSD box, I have between 10 and 30%
packetloss - all day long, no specific timeframe. If I ping the Linux
clients - no loss. If I ping back from the Linux clients to FBSD box - no
loss.

The errors I get when pinging a Linux client is this one:
ping: sendto: File too large

What we already did:
- switched interfaces in the FreeBSD box: switched from ixgbe to a gbe
interface. Both have the same issue.
- After that I configured the ixgbe interface with a different IP & subnet
and I'm able to ping without any issue to any client.
- Verified MTU's - all default;
- Cheched switch config - is empty now, it's as much configured as a fridge
:)

Any hints on where to search from here?

-- 
Met vriendelijke groeten / With kind regards,
Johan Kooijman

T +31(0) 6 43 44 45 27
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E mail at johankooijman.com