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Old 03-23-2010, 06:08 PM   #1
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Registered: Mar 2010
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Setting up a transparent proxy with only one box.

I am playing around with transparent proxies, unfortunately I do not have two machines to test it out with. The current way I am doing things is the program makes a request to a computer on port 80, I use
iptables -t nat -A OUTPUT -p tcp --destination-port 80 -j REDIRECT --to-port 1234
to redirect to my proxy that is listening on port 1234. The proxy will send out a request to port 81 (as all outbound port 80 are being fed back in to the proxy and if it sent out to port 80 it would just be a infinite loop) so I want to do something like
iptables -t nat -A OUTPUT -p tcp --destination-port 81 -j DNAT --to-destination xxxx:80
The problem lies with the xxxx part. How do I change the destination port without changing changing the destination ip? Or am I doing this setup completely wrong, I am learning after all and constructive criticism is definitely appreciated.

The machine I am using is pretty low end so I would like not not have to create a VM with a second box unless absolutely necessary.
Old 03-23-2010, 06:32 PM   #2
Registered: Feb 2010
Distribution: gentoo, arch, fedora, freebsd
Posts: 379

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To avoid the cycle
iptables -t nat -A OUTPUT -p tcp --destination-port 80 -m owner --gid-owner your_gid -j REDIRECT --to-port 1234

or you can mark packets

Last edited by troop; 03-23-2010 at 06:36 PM.


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