Re: Weird NFS problems

From: Skylar Thompson (skylar_at_cs.earlham.edu)
Date: 05/31/05

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    Date: Tue, 31 May 2005 21:00:46 +0100
To: <james@FreeBSD.ORG>

    Jon Dama wrote:

    >Yes, but surely you weren't bridging gigabit and 100Mbit before?
    >
    >
    >Did you try my suggestion about binding the IP address of the NFS server
    >to the 100Mbit side?
    >
    >

    Yeah. Unfortunately networking on the server fell apart when I did that.
    Traffic was still passed and I could get through to the server on the
    100Mb/s side, but not on the 1000Mb/s. It looked like the arp tables
    weren't being forwarded properly, but I couldn't convince FreeBSD to do
    proxy arp.

    After doing some more poking around, it actually looks like it might be
    a misfeature in the Linux 2.4 kernel wrt ipfilter (which is running on
    the bridge). Apparently 2.4 fragments UDP packets in the reverse order
    that every other UNIX-like operating system does, which throws off
    ipfilter's state tables. I'm going to do some testing to see if the
    difference between UDP and TCP NFS is negligible enough for us to disregard.

    Thanks for the suggestions! 

    -- 
-- Skylar Thompson (skylar@cs.earlham.edu)
-- http://www.cs.earlham.edu/~skylar/

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