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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 <lk@tantalophile.demon.co.uk>
>
> 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.

-Andi
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