netdev - REDIRECT in nat OUTPUT

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Message-Id: <200807120424.56462.denys@visp.net.lb>
Date:	Sat, 12 Jul 2008 04:24:56 +0300
From:	Denys Fedoryshchenko <denys@...p.net.lb>
To:	netdev@...r.kernel.org
Cc:	netfilter-devel@...r.kernel.org
Subject: REDIRECT in nat OUTPUT

I notice TX performance issues while using REDIRECT rule in -t nat -I OUTPUT chain.

To reproduce:
First let's test network and HDD speed 
homecore ~ # scp PSA_schematique_07H.iso root@....0.0.1:/tmp
PSA_schematique_07H.iso                                                                                                      7%  335MB  25.7MB/s   02:39 ETA
^C
Killed by signal 2. (i kill it)


Second let's do the trick
iptables -t nat -I OUTPUT -p tcp --dport 23 -j REDIRECT --to-ports 22
scp -P 23 PSA_schematique_07H.iso root@...host:/tmp
PSA_schematique_07H.iso                                                                                                      0% 8728KB 121.3KB/s 10:22:05 ETA
^C
Killed by signal 2.

Always all rules with REDIRECT to local port is dropping speed around 100Kbyte/s. What can be the problem?

-- 
------
Technical Manager
Virtual ISP S.A.L.
Lebanon
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