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    SubjectRe: ECN & cisco firewall
    On Sat, Sep 09, 2000 at 03:38:26AM -0700, David S. Miller wrote:
    > Date: Sat, 9 Sep 2000 12:32:34 +0200
    > From: Jamie Lokier <>
    > So our TCP stack can observe this and say "ah, that route doesn't
    > do ECN; let's retry without ECN and see if we get a better
    > response".
    > This might work. Although, a tougher case to handle are the
    > firewalls which just silently drop the packet if ECN bits are
    > set. The timeout is just too long to make a "backdown and try
    > withough ECN" scheme worthwhile in that case.

    It is just the same thing as pmtu blackhole detection, and very
    hard to get right. I tried to implement a good scheme for pmtu blackhole
    detection for linux, but failed.

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