FC2 and kernel 2.6.7 upgrade problems.

Steven Stern subscribed-lists at sterndata.com
Sat Aug 7 19:50:56 UTC 2004


On Sat, 7 Aug 2004 18:56:08 +0000 (UTC), "Andreas M. Kirchwitz"
<fedora-list at list.zikzak.de> wrote:

>Emil Valsson <emil at netsamskipti.is> wrote:

>Kernel 2.6.7 uses different network parameters than kernel 2.6.6.
>For example, window scaling is turned on in 2.6.7 (but it was off
>on 2.6.6). This causes problems with most firewalls. Execute the
>following command with root privileges, that should "fix" the
>networking problem for all new connections:
>
>	sysctl -w net.ipv4.tcp_default_win_scale=0
>
>Put this in your /etc/rc.d/rc.local file or put
>"net.ipv4.tcp_default_win_scale = 0" directly into
>/etc/sysctl.conf (which is the better way, but be careful
>that it doesn't get overwritten by package updates).
>
>Actually the Linux kernel is fine, the problem is in the firewalls
>and/or their configuration. If anybody knows how to configure a
>Cisco (with and without inspection) to work with window scaling,
>I'd be happy about some hints.

Does this apply to relatively dumb switches, too?  I'm seeing tremendous
slowdowns with 2.6.7.
--
   Steve
   





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