FreeBSD 4.2 ipfw natd -- Port Forwarding?

[Russ <xminer () home com>]

Hi, fist time poster, thanks for the cool mailing list...

I am using FreeBSD 4.2 and have set up a pretty good firewall using ipfw 
and natd via some tutorials and documentation I have found. So it works but 
now I need to customize it a little...

Question:  How can I allow incoming connections through my firewall.  The 
client lets me specify what port to listen to incoming requests on, before 
I was using a router that had built in port forwarding... So the client is 
set to listen on 8877 and router forwards incoming request to port 8877 to 
computer with ip 192.168.1.3 for port 8877, you get the picture?

I would like to learn how to write the rule in my ipfw script that might do 
the same thing, forward incoming requests to my external ip on port xxxx to 
internal ip xxx.xxx.xxx.xxx port xxxx.  The port would not change of course...

how do I write the rule? I suppose this rule could be used for any incoming 
request, and I am sure people use it to allow access to http and ftp 
through a firewall, so there must be an acceptable rule to do it, any ideas?

$ipfw pass tcp "for port 8877 only" to 192.168.1.3:8877 via $oif (external 
interface) ?  I have no clue how it should be.


_______________________________________________
firewall-wizards mailing list
firewall-wizards () nfr com
http://www.nfr.com/mailman/listinfo/firewall-wizards