Re: Problem with Path MTU Discovery

gnn_at_freebsd.org
Date: 07/14/05

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    Date: Thu, 14 Jul 2005 12:46:11 +0900
To: Jeremie Le Hen <jeremie@le-hen.org>

    At Wed, 13 Jul 2005 15:00:42 +0200,
    Jeremie Le Hen wrote:
    >
    > Hi,
    >
    > I set a gif(4)-based IPSec tunnel between my network and a friend's one.
    > This works pretty well, except that Path MTU Discovery doesn't work.
    >
    > Quick draw:
    > MTU: 1500 MTU:1280 MTU:1500
    > Comp1 --------- Gate1 -------- Gate2 -----+-- Comp2
    > RELENG_5 RELENG_4 RELENG_5 | RELENG_5
    > |
    > +-- Comp3
    > RELENG_5
    >

    Can you look at the routing table for each of Comp1 and Comp2 and also
    use the -W flag to show the path MTU? If there is something wonky in
    the routing table then TCP will not hear about the MTU change.

    Thanks,
    George
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