netdev - REDIRECT in nat OUTPUT

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

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
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html