Iptables all port forward? 2

[rninja]

How can I get every inside or outside IP forwarded on any port to port 80 on a local server through iptables?

Essentialy, I want to be able to have users login through a webpage and I want every port to forward to port 80 for that.

What code do I need to use to properly config this in Iptables?

Thanks in advance!

Rninja

http://www.rninja.com

 

[thedaver]

It sound like you're trying to build a PPPoE Auth server?

You can route your firewall's external IPorts to a specific IPort interally. This is a function of "SNAT"/"DNAT", I forget what it's literally called.

The internal bit is a little sticky since you're probably going to have to force the internal hosts through a proxy.

In fact, commercial and open-source solutions for this sort of auth ("NoCat", and "Microtik&quot use an internal facing proxy to force the local hosts to login and be auth'd.

Good luck.

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[jsauce]

iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 1:65535 -j REDIRECT --to-port 80

You will also need to setup an input to chain to allow everything in from specific ip addresses, or all ip addresses with an (of course change these to meet your network needs):

iptables -A INPUT -i eth0 -p tcp -s 0/0 -j ACCEPT



John D. Saucier
jsauce@magicguild.com
Certified Technician
Network Administrator

 

[rninja]

Thanks Guys! That helped me figure out what schema I was to use and the syntax.

Rninja

http://www.rninja.com