Question

Redirecting traffice with IPTABLES

Asked by: archerlogic

Dear Experts,

Running Centos 5. Would like to redirect traffic coming into ip address 10.10.10.11 port 25 to localhost port 2525.

Tried this rule.

iptables -A RH-Firewall-1-INPUT -p tcp -m tcp -d 10.10.10.11 --dport 25 -j REDIRECT  --to 127.0.0.1:2525

But I got this error.

iptables: Unknown error 4294967295

Please enlighten. Thanks a lot.

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Asked On
2008-05-13 at 03:06:35ID23397143
Topics

Linux Network Security

,

Network Software Firewalls

,

Miscellaneous Networking

Participating Experts
4
Points
500
Comments
9

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Answers

 

by: shakoush2001Posted on 2008-05-13 at 03:15:38ID: 21553563

Does the chain RH-Firewall-1-INPUT exist ?

Try

iptables -A RH-Firewall-1-INPUT -p tcp  -d 10.10.10.11 --dport 25 -j REDIRECT  --to 127.0.0.1:2525

 

by: BlazPosted on 2008-05-13 at 04:15:36ID: 21553824

I kind of remember that redirecting to local loopback is not possible. I will check and try to get a reference on that.

 

by: BlazPosted on 2008-05-13 at 04:44:22ID: 21554002

Least to say loopback interface has some problems/limitations:

You can't send packets from non 127/8 addresses to 127/8.  The kernel
filters them out and drops them as it considers them "martians".
(http://lists.netfilter.org/pipermail/netfilter/2004-August/055074.html)

http://www.experts-exchange.com/Networking/Linux_Networking/Q_22862486.html

 

by: DaveHowePosted on 2008-05-13 at 05:01:20ID: 21554116

shouldn't that be DNAT not REDIRECT?

 

by: DaveHowePosted on 2008-05-13 at 05:06:42ID: 21554159

try:

iptables -A RH-Firewall-1-INPUT -p tcp  -d 10.10.10.11 --dport 25 -j DNAT  --to-destination 127.0.0.1:2525

 

by: RedimidoPosted on 2008-08-05 at 09:43:25ID: 22162689

In fact the problem is you used the incorrect table.

use this rule

iptables -A PREROUTING -t nat -p tcp -m tcp -d 10.10.10.11 --dport 25 -j REDIRECT  --to-port 2525

that's all.

20120131-EE-VQP-002

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