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From: Neil Brown <>
To: Jeff Davis <>
Subject: Re: round robin dns, multihomed host, nfs mounting issues
Date: Sat, 19 Jul 2003 20:34:21 +1000	[thread overview]
Message-ID: <16153.7853.242076.368335@gargle.gargle.HOWL> (raw)
In-Reply-To: message from Jeff Davis on  July 18

On  July 18, wrote:
> I'm testing out a NFS server which has two interfaces on two different
> subnets. I'm using a single hostname and round robin dns. Clients are
> both RedHat Linux systems.
> I can access the primary interface on server via NFS from any system on
> my network. I can only access the second interface from hosts on the
> same subnet. Unfortunately, round robin dns on systems that are not
> local to subnets on either of the server's nics will randomly get one of
> the two nics to access nfs fs through. 
> int 1 -
> int 2 -
> # can mount through int 1 from any host\
> # can mount thoughh int 2 from same ip subnet as int 2
> # cannot mount throught int 2 from remote ip subnets
> # on local subnets, mounts work as desired through correct, optimal
> interface on nfs server
> # on remote subnets, round robin directs ~50% of mount requests
> to server through int 2 which fail
> why doesn't this work?

Looks like you've hit a glibc bug that was only fixed relatively
recently (27th Feb 2003.  glibc version 2.3.2 or 2.3.3 I think).

When mountd is sending it's reply, it uses sendmsg and insists that the
reply goes out the same interface that the request came in on.  If
that interface doesn't have a route to the client, you lose.

I worked around it by putting a default route on all my interfaces.

> upgrading to nfs-utils 1.05 seems to have helped

I doubt that it really did, but if it works now, great.


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  reply	other threads:[~2003-07-19 10:35 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-07-18 17:31 round robin dns, multihomed host, nfs mounting issues Jeff Davis
2003-07-19 10:34 ` Neil Brown [this message]
2003-07-19 13:07 Davis, Jeff (Houston)
2003-07-20 23:32 ` Neil Brown
2003-07-20 23:41 Davis, Jeff (Houston)
2003-09-22 19:50 Jeff Davis

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