lkml.org 
[lkml]   [2000]   [Sep]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    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
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-03-22 12:38    [W:0.021 / U:3.648 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site