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iptables: redirect DNS

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yakapiece
Tux's lil' helper

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Joined: 03 Feb 2004
Posts: 126
Location: Atlanta, GA

Posted: Mon Dec 06, 2004 4:49 am Post subject: iptables: redirect DNS

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I've search forums and the howto on LDP but what am I doing wrong?

Code:

iptables -t nat -A PREROUTING -p udp --dport 53
-j DNAT --to-destination xxx.xxx.xxx.xxx:xx

iptables -t nat -A OUTPUT -p udp --dport 53 -j DNAT --to xxx.xxx.xxx.xxx:xx

The first is successful, but the second I get

iptables: Invalid argument

I'm looking to redirect the dns from behind my firewall, I've seen a few examples like the above.

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mayday147
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Joined: 22 Mar 2004
Posts: 825
Location: Bucharest, Romania

Posted: Mon Dec 06, 2004 5:50 am Post subject:

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The 'OUTPUT' chain is not a part of the 'nat' table , so try this:

Code:

iptables -A OUTPUT -p udp --dport 53 -j DNAT --to xxx.xxx.xxx.xxx:xx

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yakapiece
Tux's lil' helper

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Joined: 03 Feb 2004
Posts: 126
Location: Atlanta, GA

Posted: Mon Dec 06, 2004 5:19 pm Post subject:

thank you for your response, but I get the same error iptables: Invalid argument Any other suggestions?

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JohnDoe
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Joined: 15 Dec 2003
Posts: 96
Location: Lisbon, Portugal

Posted: Tue Dec 21, 2004 10:31 pm Post subject:

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yakapiece wrote:

thank you for your response, but I get the same error
iptables: Invalid argument

Any other suggestions?

If I'm not mistaken, the problem now is with -j DNAT since in the filter table (the default one) there isn't a -j argument (at least coupled with DNAT) can't be used. But I'm just guessing, haven't been around iptables for a while...

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