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Old 03-13-2013, 11:45 PM   #1
Registered: Aug 2011
Location: Russia
Distribution: Debian
Posts: 32

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Is it possible to use squid in same ip subnet with WAN IP? Iptables Squid port problem.

I have squid machines they all have 2 nics and
Modem --> eth0( Squid eth1( --> LocalSwitch

But recently, Programmers requested from me that I have to use the same ip subnet for two nics.
Modem(>eth0( eth1(>LocalSwitch

Before this request my iptables rules:
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
iptables -t nat -A PREROUTING -i eth1 -p tcp -m tcp --dport 80 -j DNAT --to-destination
iptables -t nat -A PREROUTING -i eth0 -p tcp -m tcp --dport 80 -j REDIRECT --to-port 3128

But this is not working anymore and
I have trouble writing new iptables script.
How can I do that?
Can you help me on this?
Thanks in advance.

Last edited by neopandid; 03-14-2013 at 03:44 AM.
Old 03-15-2013, 08:49 AM   #2
Registered: Jun 2001
Location: UK
Distribution: Gentoo, RHEL, Fedora, Centos
Posts: 43,417

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that's not possible, as your squid box would no longer be being used as the route between the client and the internet. As you've got (HORRIBLE) transparent proxying, you have to contrive a routing layout so that you see that traffic and intercept it. You'd have to do some weird stuff to make the clients route to your machine and then back out again the same interface to the net.

This is all horrible. Best advice is to rip out the transparent rules and just tell them to hit the proxy directly.
1 members found this post helpful.
Old 03-18-2013, 02:14 AM   #3
Registered: Aug 2011
Location: Russia
Distribution: Debian
Posts: 32

Original Poster
Rep: Reputation: Disabled
I thought so, too.
Thanks a lot.
I will explain this to my manager.

Last edited by neopandid; 03-18-2013 at 03:09 AM. Reason: typo


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