Messages in this thread |  | | Date | Sat, 9 Sep 2000 16:14:15 +0200 | From | "Andi Kleen" <> | Subject | Re: ECN & cisco firewall |
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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.
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