Re: DNS and NAT

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OK, thanks I was not sure what is the proper behavior regarding iptables and DNS.

If answer is not translated then how do I get DNS to work with two way NAT?
My internal network does not understand any of the ip addresses that belong to outside. So if the request for a page that is sent from internal network comes back from outside with an answer (ip address) that is not getting translated then I can't resolve the page since my internal network doesn't understand it and can't route to it. Is there a way around this problem? How do I get DNS to work in the type of environment I described?

Thanks


From: Jason Opperisano <opie@xxxxxxxxxxx>
To: netfilter@xxxxxxxxxxxxxxxxxxx
Subject: Re: DNS and NAT
Date: Mon, 11 Jul 2005 15:41:13 -0400

On Mon, Jul 11, 2005 at 12:37:31PM -0700, Suzana Lojic-Skoric wrote:
> Does DNS work with iptables NAT or I need some kind of ALG to get DNS
> answers translated?
>
> I am using Mandrake Linux 10.0. I have two way NAT going on and I am trying
> to get DNS requests through the NAT. I got FTP, HTTP and SMTP working
> through the NAT, but DNS is not working properly, DNS answer is not getting
> translated.

nor should it be.

> Source and Destination addresses in DNS message are properly
> translated, but the actual answer (the ip address embedded in the message)
> is not translated.

which is exactly how it's supposed to work.  how the $%#@ is iptables
supposed to know what to rewrite the answer to?

if you are using BIND, look into the functionality offered by "views."

-j

--
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 through you.
 Stewie: Wonderful. And while we're at it, we can light up a doobie and
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 Peter: Eh... yeah?"
        --Family Guy


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