From: Chris Rankin <rankincj@yahoo.com>
Subject: No UDP NFS over bridges in Linux 2.6.16.x?
Date: Fri, 14 Apr 2006 14:42:20 +0100 (BST)
Message-ID: <20060414134220.25554.qmail@web52903.mail.yahoo.com>
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Cc: shemminger@osdl.org, nfs@lists.sourceforge.net
To: bridge@osdl.org
Sender: nfs-admin@lists.sourceforge.net
Errors-To: nfs-admin@lists.sourceforge.net

Hi,

I have 2 servers which are connected to a gateway machine. The gateway an=
d one server are running
Linux 2.6.16.2, while the third machine is running 2.6.16.5. The two ethe=
rnet ports on the gateway
which are connected to the servers are combined into a single ethernet br=
idge device.

Ever since 2.6.16, I have noticed that I can no longer cross-mount the tw=
o servers' /home
directories via UDP NFS. Which is to say that the mount command succeeds,=
 but that trying to
access the filesystem makes the process hang and the "NFS server not resp=
onding" message to appear
in the console log. This is true regardless of which machine is the NFS s=
erver and which is the
NFS client.

It all works fine if I use TCP NFS instead.

Also, UDP NFS works OK between any server and the gateway itself, so it o=
nly goes wrong when UDP
NFS traffic is forwarded across the bridge. (I have not changed my firewa=
ll rules, which just tell
the gateway to forward all traffic coming in from the bridge device anywa=
y.)

Can anyone reproduce this, please? I obviously have a workaround (using T=
CP instead of UDP) but it
sounds like there's a bug somewhere.

Cheers,
Chris


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