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From: Christian Mayrhuber (christian.mayrhuber_at_gmx.net)
Date: Wed 07 Jan 2004 - 17:50:47 GMT


christian niessner wrote:

>
> das ist aber nicht zufaellig das tcp_ecn problem?
>
> cat /proc/sys/net/ipv4/tcp_ecn
> echo 0 > /proc/sys/net/ipv4/tcp_ecn
>
> weil, imho, bis 2.4.18 war default 0, ab 2.4.19 ist default 1...
>
> ciao,
> marvin
>

Ja ist es! (Yes it is!)
Vielen Dank!

Here is what /usr/src/linux/Documentation/Configure.help says about it:

TCP Explicit Congestion Notification support
CONFIG_INET_ECN
   Explicit Congestion Notification (ECN) allows routers to notify
   clients about network congestion, resulting in fewer dropped packets
   and increased network performance. This option adds ECN support to
   the Linux kernel, as well as a sysctl (/proc/sys/net/ipv4/tcp_ecn)
   which allows ECN support to be disabled at runtime.

   Note that, on the Internet, there are many broken firewalls which
   refuse connections from ECN-enabled machines, and it may be a while
   before these firewalls are fixed. Until then, to access a site
   behind such a firewall (some of which are major sites, at the time
   of this writing) you will have to disable this option, either by
   saying N now or by using the sysctl.

   If in doubt, say N.

An enty in /etc/sysctl.conf: net/ipv4/tcp_ecn=0
and "systcl -p" will do away with this problem.

-- 
lg, Chris
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