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NFR Wizards Archives: Firewall with FreeBSD 3.3

Firewall with FreeBSD 3.3

Subject: Firewall with FreeBSD 3.3
From: Adidas Boy (binkieboihotmail.com)
Date: Thu Dec 09 1999 - 11:58:46 CST

Dear Firewall Wizards,

I have been using FreeBSD for about 2 years now. I have learned quite a bit
over the time as far as simple things to do to make it harder for someone to
break into my machine such as installing tcpd to only allow certain hosts,
then disabling certain services that are not needed.

It recently decided I wanted to create a machine that had the above features
but also did more firewall type of stuff. I have been trying to do some
reasearch and learned a little about natd and ipfw which does some type of
ruleset things. I'm trying to accomplish the following and wanted some help
from anyone of you that could help me. What i want to achieve is all
external real ips on the internet be mapped to a certain fake ip and so all
requests would have to go thru the firewall so for instance.

computer 1:
  internal ip: 10.0.0.1

computer 2:
  internal ip: 10.0.0.2

then have the firewall have something like this:

205.1.2.1 => 10.0.0.1
205.1.2.2 -> 10.0.0.2

so in essence the firewall would listen to 205.1.2.1, 205.1.2.2, etc.
and then route to the appropriate machine so the person on the outside could
never really talk directly to the machine. can this be done with natd and
what would i need to do to the configuration to make this work?

Any help would be appreciated!

Brian

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This archive was generated by hypermail 2b27 : Fri Dec 10 1999 - 16:33:47 CST