Ubuntu server port forwarding

Discussion and support for all Linux distributions and Unix flavours (FreeBSD, OpenBSD, etc).
Post Reply
ElDiablo
Registered User
Posts: 1012
Joined: 30 Jun 2004, 02:00
Location: Potchefstroom

Ubuntu server port forwarding

Post by ElDiablo »

Hi there,

I need some help setting up port forwarding.
We have 3 servers, 1x running Ubuntu server (used as transparent proxy), 1x server 2003, 1x windows xp.

The linux box has the following ips:
eth0 (internal) 192.168.1.5
eth1 (external) 192.168.0.7

Windows server 2003:
192.168.1.6

Windows XP:
192.168.1.9

Router:
192.168.0.1

The router automatically forwards spesific ports to 196.168.0.7 (Linux eth0)
From there I want to forward port 8585 to 192.168.1.6 and 3000 to 192.168.1.9
is there a way that I can do this using iptables?
The commands that I think I'm gonna use look like this:
iptables -A FORWARD -s 192.168.0.0/24 -p tcp --dport 8585 -d 192.168.1.6 -j ACCEPT
iptables -A FORWARD -s 192.168.0.0/24 -p tcp --dport 3000 -d 192.168.1.9 -j ACCEPT

Would this be a correct way of doing it?

Also, The proxy captures all data on port 80 and forwards it to 3128 so that the proxy can monitor the usage, and a few systems runs fine with it, others however can ping websites, and internet explorer says "website found, waiting for reply" but the webpages cannot be displayed :-/
I can post the entire routing script should it be needed..

I'm fairly new to linux and this is the first proxy that I've set up.
Anthro
Moderator Emeritus
Posts: 5547
Joined: 21 Dec 2002, 02:00
Processor: i7 3770k
Motherboard: ASUS P8P67-Pro
Graphics card: 2xNvidia GTX670
Memory: 16 GB Gskill Sniper
Location: In SQL Space inserting 'null' on purpose
Contact:

Re: Ubuntu server port forwarding

Post by Anthro »

What does the gateway do with DNS (53) requests ?
Temporary Absence
ElDiablo
Registered User
Posts: 1012
Joined: 30 Jun 2004, 02:00
Location: Potchefstroom

Re: Ubuntu server port forwarding

Post by ElDiablo »

Anthro wrote:What does the gateway do with DNS (53) requests ?
I've descovered now that DNS request doesn't go through anymore.... think I broke it :-(
Anthro
Moderator Emeritus
Posts: 5547
Joined: 21 Dec 2002, 02:00
Processor: i7 3770k
Motherboard: ASUS P8P67-Pro
Graphics card: 2xNvidia GTX670
Memory: 16 GB Gskill Sniper
Location: In SQL Space inserting 'null' on purpose
Contact:

Re: Ubuntu server port forwarding

Post by Anthro »

Start there..
Temporary Absence
Post Reply