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List:       linux-nfs
Subject:    Re: [NFS] showmount -e  {error}
From:       Ion Badulescu <ionut () cs ! columbia ! edu>
Date:       2001-10-31 22:23:28
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On Wed, 31 Oct 2001 13:28:20 -0600, Jeff W. Hampson <jwhamps@ilstu.edu> wrote:

> hosts.allow and hosts.deny are both blank.

Right, a tcp_wrappers failure would result in something other than 
timeout.

> When looking at /var/log/messages on the nfs server it states that it has
> authenticated the request.
> However, on the client machine you recieve a mount: RPC: Timed out
> 
> It seems like the client is able to send the server information to
> authenticate, however the server can't send any thing back.

Run tcpdump on the client and see what's going on, we can't begin to guess 
otherwise.

> however, even more strange is that ssh, rpcinfo, host  all work from the
> client when contacting the server hosting nfs.  So some information must be
> coming back to the client from the server..

ssh and rpcinfo are TCP-based, and host uses a connected UDP socket, so
this could be a routing/addressing issue, which only affects unconnected
UDP sockets. But again, this is only a wild guess (as was my previous DNS
guess). I'm not even sure if mount/showmount use connected sockets or not.

basically what happens when the server is multi-homed is that the client 
sends the request to an IP address, the server replies from another IP 
address (but which, from *its* point of view, is the closest to the client 
in terms of network routing), and the client discards the reply 
because it's coming from an unknown address.

Again, take the above with a grain of salt. The scenario is real, but it 
might not apply in your case. tcpdump is your only friend here...

Ion

-- 
  It is better to keep your mouth shut and be thought a fool,
            than to open it and remove all doubt.

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