jumbo-frames on the network

mi+mx_at_aldan.algebra.com
Date: 01/29/04

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    To: net@FreeBSD.org
    Date: Wed, 28 Jan 2004 20:49:02 -0500
    
    

    Hello!

    Some newer machines on our FreeBSD/Linux/Windows network have 1000BaseT
    network cards capable of jumbo frames up to 16K (mostly em(4)).

    They are plugged into a big switch, which supports jumbo frames up to 9K
    on each port.

    However, when I try to crank the MTU up on this machines (up to the
    switch's limitation), weird things start happening -- mostly NFS
    problems. I can login to a remote host (wich has MTU of 1500), but it
    will not be able to access the NFS partitions exported by a jumbo-frames
    enhanced box.

    Can different MTUs be mixed on the same wire -- in theory (who is to do
    the fragmentation?) and in practice -- or do we need to isolate these
    machines on a subnet of their own (so that they can keep fast-talking to
    each other) and put something dual-homed between them and the rest of
    the network?

    Do the logins just work because no packet exceeds 1500 anyway?

    Thanks for any advice!

            -mi

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  • Next message: ap296: "RE: Recommendation for "antivirus" software (MTA is qmail)"

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