Date: Tue, 24 Sep 2002 12:41:30 -0500 From: Eric Anderson <anderson@centtech.com> To: Terry Lambert <tlambert2@mindspring.com> Cc: freebsd-chat@freebsd.org Subject: Re: FreeBSD NFS server using two NICs Message-ID: <3D90A3CA.7070004@centtech.com> References: <3D8A3E52.2090202@centtech.com> <3D8A428B.B96FBE75@mindspring.com> <3D8A458B.2080608@centtech.com> <3D8A4B40.67C8E2A2@mindspring.com> <3D8F66AB.8020309@centtech.com> <3D8F8401.E77A5DA9@mindspring.com> <3D90775C.9080804@centtech.com> <3D9078D2.8090401@centtech.com> <3D9097BB.3241C644@mindspring.com>
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[-- Attachment #1 --]
Terry Lambert wrote:
>
> Try:
>
> netstat -s | head -25 | tail -2
>
> ... and tell us if you see anything different from:
>
> 0 discarded for bad checksums
> 0 discarded for bad header offset fields
>
> It's possible that the problem is that you have bad hardware
> checdksum hardware in the senders, and the packets are being
> dropped intentionally because of this.
>
>
> It could also be that the reassembly buffers are not being
> mixed... which still means you need to look at the wire
> contents again.
Ok, here's some more goodies.. Netstat -s looks fine..
On the server, a netstat -a shows:
Proto Recv-Q Send-Q Local Address Foreign Address (state)
tcp4 2392 0 otter.nfsd netman.1009
ESTABLISHED
Server's name is otter and netman is the solaris 7 client (using
autmounter to use the nfs share).
The server is running FreeBSD 4.6.2.
And I've attached a small tcpdump (-w filename.txt -vvv host netman) run
from the server to capture the "trigger". It's only a few packets, but
these are the packets that make it go bad.
Also, I'm running nfsd on the server like so:
nfsd -h ip.of.nic.1 -h ip.of.nic.2 -t -u -n 10
If I run nfsd like:
nfsd -h ip.of.nic.1 -t -u -n 10
it works fine.
It isn't a bad NIC on the server (I've tried multiple nics, mutliple
servers, and different FreeBSD OS versions) - but it could possibly be a
bad NIC on the client side.
What other data do you need?
Heck, if I need to, I'll set up a "test bed" that you can access, and we
can go from there.
Eric
--
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Eric Anderson Systems Administrator Centaur Technology
The moon may be smaller than Earth, but it's further away.
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