From: Alexander Goeres (agoeres_at_lieblinx.net)
Date: Thu 08 Jan 2004 - 10:56:19 GMT
Hi Chistian!
Thanks a lot, merci beaucoup, vielen Dank, mange tak!!
It really works!
Looks as if it's nessesary to read the kernel-source-docs even if one never
intends to become a kernel hacker.. So bashing foreign admins is no longer
needed, what a relief..:-)
Greetings
Alexander
Am Mittwoch, 7. Januar 2004 18:50 schrieb Christian Mayrhuber:
> 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.
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