ipfw/natd broken?

[Clint Wilson]

Troy Settle wrote:

> All,
>
> I have a box (486, 16mb) running FreeBSD 3.51-something.  It's been in 
> service for the better part of 10 years (originally 2.0.5 or so).  
> It's acting as a router/nat device for a network with about 50 desktop 
> systems, and has never given me a problem until this week.

Troy, I would highly highly recommend upgrading your system. It is 
apparent it has internet access, and there are numerous exploits that 
could compromise the integrity of your entire network.

>
> It seems that VPN (PPTP) won't work behind NAT.  I can use VPN tunnels 
> from XP PRO to both windows servers and linux-based VPN servers all 
> day long from home using my netgear broadband router, but from this 
> location, behind the FreeBSD box, they won't work.

The aforementioned being said, I am unaware at this time of any reason 
why this might not work on 3.5. I am currently doing this same setup 
IPFW+NATD+FreeBSD 4.11 (Soon to be upgraded to 5.4) and it is working 
with no problems. There have been a lot of changes to IPFW since your 
version of FreeBSD I am also sure the natd daemon has been revised as 
well since your version. I would upgrade to 5.4 set your nat and ipfw 
back up and see if the problem still is there.

>
> What gives?
>
>
-- 
Clint Wilson
Southern Comp Solutions LLC
http://www.scsisp.com