Re: kernel 2.4.18 -> 2.4.20 subtle upgrade problem

[Andy Hurt <andy.rew6@verizon.net>]

Graeme Tank wrote:
> I've been happy with my self-compiled 2.4.18 kernel on a stable/testing
> Woody system that is mostly stable.
>
> Recently, I installed kernel-source-2.4.20-6 and used my 2.4.18 config
> file to compile 2.4.20. I compile my kernels like so:
>
> $ cd /usr/local/source/kernel-source-2.4.20
> $ cp /boot/config-2.4.18-gat.05 .config
> $ make menuconfig          // didn't change anything but did save
> $ make-kpkg clean
> $ VER=gat.05
> $ make-kpkg -rootcmd fakeroot --append-to-version -${VER}
> --revision=${VER} kernel_image
> # dpkg -i ../kernel-image-2.4.20-gat.05_gat.05_i386.deb
>
> Now the problem. Using the 2.4.20 kernel I can access every website I
> could with the 2.4.18 kernel except for http://www.wash.k12.mi.us and
> http://www.remc.org. This is interesting in and of itself, but this is
> also the only way my wife can access her webmail. She's also largely
> responsible for the content of both sites.
>
> [snip]
>
> http://www-personal.umich.edu/~graemet/config-2.4.20-gat.05

#
# Automatically generated make config: don't edit
#

[snip]

CONFIG_INET_ECN=y

[snip]

> Any help would be appreciated. It might be interesting to see if those
> of you running the 2.4.20 kernel have a similar problem.

Aye; I, too, had activated 'Explicit Congestion Notification' in menuconfig.

Try this as root:

echo "0" > /proc/sys/net/ipv4/tcp_ecn

If you can then get to the aforementioned sites after doing so, tcp_ecn the 
culprit ;-\
--
andyrew