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08.29.2007 at 08:00AM PDT, ID: 22794526
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8.2

iptables routing troubles

Asked by Vision in IP Tables/IP Chains, Linux Networking

Tags: ,

I'm having a heck of a time getting my Linux routing to work.  Because I was hacked a while back I decided to build in two levels of firewall in order to try to protect my systems.  My network looks like this:
Internet -> [DLINK] Router -> [LinuxBox] -> Home Network

I've set up my [DLINK] router to open up the ports for FTP and SSH to my [LinuxBox] and its working great, but when I try to open up a port on the [DLINK] and then open up the ports on the [LinuxBox] to go to one of my windows boxes on the other side it doesn't seem to be working.

So here's some more specifics:
Outer Network:
[DLINK] Router (192.168.0.1)
[LinuxBox] (192.168.0.xx) (ETH1)
Inner Network:
[LinuxBoxInner] 10.10.10.1 (ETH0)
[WebServer] 10.10.10.xx  (On port 8089)

It has been tested and works that any other windows box on 10.10.10.xxx network can connect to [WebServer]:8089 and works.

Under my impression of how it all works, this is what I thought should do it:
/sbin/iptables -t nat -A PREROUTING  -i eth1 -p tcp --dport 8089 -j DNAT  --to [WebServer]:8089

It does not seem to be working.
I'll add my IPTABLES outputs in a message right after this (for readability).
I also understand that the 'Accept' on all the chains are likely not a good security measure, but I'm bypassing that for now.

Thanks for the help.
(Other info: Red Hat FC3)Start Free Trial
[+][-]08.29.2007 at 08:00AM PDT, ID: 19791947

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[+][-]08.30.2007 at 12:59AM PDT, ID: 19798166

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About this solution

Zones: IP Tables/IP Chains, Linux Networking
Tags: iptables, routing
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Solution Provided By: Blaz
Participating Experts: 1
Solution Grade: A
 
 
[+][-]08.30.2007 at 01:00PM PDT, ID: 19803642

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