NFS 4 client callback port

[Guillaume Rousse]

Hello list again.

We successfully uses NFS4 from machines in a DMZ, whith port 2049 opened 
from client to server only. However, my server logs are filled with this 
kind of messages:
May 27 07:34:12 nation kernel: nfs4_cb: server 193.55.250.161 not 
responding, timed out

 From reading 
http://www.vanemery.com/Linux/NFSv4/NFSv4-no-rpcsec.html#notes, In 
understand than callback requires a client port to be accessible from a 
server-initiated connection. I found nowhere which port it is exactly 
(2049 again ?), but  as it is mentionned than in the future this port 
should be make constant, it seems to implies to be currently variable 
(but the document itself is quite old). Can someone enlighten me on this 
issue ?

-- 
Guillaume Rousse
Moyens Informatiques - INRIA Futurs
Tel: 01 69 35 69 62