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02.14.2006 at 10:44AM PST, ID: 21736436
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6.6

Help with rc.firewall script

Asked by escheider in Linux Network Security

Tags: , ,

Hello experts:

I'm fairly new to iptables, so I used a firewall generator to create my iptable firewall script.  Everything seems to work fine, except I wanted to limit what ports could be used for our internal users.  My firewall script is 16 pages long, so I didn't want to clutter up this site with several pages, so I've included a link to a pdf file of my firewall script.

I'm trying to forward ports 80 and 3389 to an internal server, but I seem to be having difficulties when I remove the highlighted line on page 13 of the firewall script.  The catch 22 is, if I leave this line in the script, users have access to more ports than I want to provide.

How can one overcome the problem by limiting the outgoing ports [which I have specified on pages 11-12 in the tcp_outbound chain] while allowing traffic from the outside to be forwarded to an internal server?

http://www.jotathought.com/rc.pdf  <-- firewall script addressStart Free Trial
[+][-]02.14.2006 at 01:11PM PST, ID: 15954886

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[+][-]02.15.2006 at 10:52AM PST, ID: 15963378

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[+][-]02.15.2006 at 01:59PM PST, ID: 15965453

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[+][-]02.15.2006 at 09:01PM PST, ID: 15968221

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[+][-]02.15.2006 at 09:06PM PST, ID: 15968230

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About this solution

Zone: Linux Network Security
Tags: iptables, 3389, internal
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Solution Provided By: Tim_Utschig
Participating Experts: 3
Solution Grade: A
 
 
[+][-]02.16.2006 at 12:18AM PST, ID: 15969002

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[+][-]02.16.2006 at 11:01AM PST, ID: 15973949

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[+][-]02.16.2006 at 11:01AM PST, ID: 15973959

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[+][-]02.16.2006 at 11:37AM PST, ID: 15974334

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