[PATCH] Lower timeout in TIME-WAIT state on conntracks

[Mikkel Refsgaard Bech]

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Hi,

This patch provides a new target called LOWTW, which gives the ability to
change the timeout in the TIME-WAIT state on connections in the conntrack
table. It always accept packets.

This is useful when you have a _lot_ of short-lived connections through
your firewall (eg. web traffic), because each conntrack have a timeout of
2 minutes (default, hard-coded) the conntrack table could be filled with
entries in the TIME-WAIT state.

The patch is simple, it just sets the timeout (specified with the
"--lowtw-set n", where n is the timeout in seconds) on the conntrack when
the conntrack enters the TIME-WAIT state.

E.g. to avoid the conntrack table to filled with entries from web traffic
from your LAN do: iptables -A FORWARD -p tcp -source 192.168.0.0/24
--dport 80 -j LOWTW --lowtw-set 10

The patch was tested against 2.4.18.

Any comments, bug-reports or questions are welcome.

Regards
Mikkel, Torben and Carsten
{mrb|mariachi|stiborg}@cs.auc.dk

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