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From
SubjectRe: 2.4.0 tcp over firewall - no connection
Date
In article <m3itnnru8n.fsf@belphigor.mcnaught.org>,
Doug McNaught <doug@wireboard.com> writes:

>> I noticed rather strange behavior: stock 2.4.0 with old ISA 3Com
>> on UP compiled as UP cannot open TCP connection to hosts behind a
>> firewall. E.g. it is impossible to go to http://www.etrade.com/ -
>> connect just never finishes. 2.2.17 on the same hardware works
>> right. 2.4.0 on SMP over PPP connection works right too. MTU
>> is 1500 in both cases. In both cases, kernel is compiled with
>> netfilter as modules, but those are not loaded.
>
> Known problem, exhaustively discussed on the list, and not related
> to your NIC. Disable ECN (explicit congestion notification), either
> in your kernel compile or in /proc/sys/<something>.

This really was ECN, sorry for noise in this list...

Eugene
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