Firewalls in FreeBSD?

[Jeremy Chadwick]

On Thu, Oct 30, 2008 at 06:34:31PM -0500, Jack Barnett wrote:
>
> Ok, I had some progress with this last night. Basically what I do is:
>
> in natd - redirect_port 1000 to 10000 to the internal windows box.
> set ipfw to "open" file wall.
>
> Obviously this isn't prefect - but gives some idea of what's going on.
>
> What I'd like to do, is a) keep the nat redirects since that works  
> pretty well.
> b) in ipfw, ONLY allow data back on these ports IF the windows box has  
> established the connection out first then deny everything else.

This is called "port triggering" in the residential router world.  I
don't know how to do this on FreeBSD.

-- 
| Jeremy Chadwick                                jdc at parodius.com |
| Parodius Networking                       http://www.parodius.com/ |
| UNIX Systems Administrator                  Mountain View, CA, USA |
| Making life hard for others since 1977.              PGP: 4BD6C0CB |