2.4.*, Squid (2.3, 2.4) и «негрузящиеся» сайты.

Привет!
Раньше на ядрах 2.4.* и Squid у меня и у некоторых других людей были проблемы - не грузились некоторые сайты. Например:
www.zyxel.ru
www.mts.ru
www.aport.ru
Проблема решена на фидошной RU.LINUX:

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

MK> Все заработало! Фантастика! Огромное спасибо. Хотелось бы еще
MK> узнать,
MK> что эта строчка делает. Поищу статьи, доку и литературу. Еще раз MK> спасибо!

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

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

NG> If in doubt, say N.

После установки tcp_ecn в ноль все негрузящиеся сайты пропали...