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SubjectRe: Is IPv4 totally broken in 2.4-test
   Date: Mon, 30 Oct 2000 23:53:57 -0600
From: Carl Perry <>

What exactly does "Explicit Congestion Notification" do?

It's a protocol extension by which routers can tell clients
about the onset of congestion before the routers stops to drop
that client's packets.

Unfortunately, a widely deployed firewall product made by Cisco and
used at most of the large web sites block packets that make use
of ECN. They have fixed the bug, but I honestly don't expect these
sites to install the fix any time soon no matter how much the Cisco
folks tell me that such sites are "likely to".

David S. Miller

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