[vox-tech] Linux networking question

[Marc Hasbrouck]

What version of Linux are you using?

For a generalized look at firewalling, look around for
the O'Reilly book Building Internet Firewalls, 2nd Ed.
It gives a non OS specific discussion of firewalling
and ports. Also, go to netfilter.org (the iptables
folks).

If you have your DHCP server and clients set up right,
local traffic should stay local. At least it does here
on my systems.

An example of the kind of addressing I use:

Local network:
IP adddresses: 192.168.100.1 through 192.168.100.254
Net Mask: 255.255.255.0
Default Gateway: 192.168.100.1

When I reference an address out side of the above
range, the packet is routed to the gateway (in this
case, 192.168.100.1). Otherwise, the packet should
never cross the gateway.

Marc

--- Michael J Wenk <mwenk@comcast.net> wrote:
> I have a question that has cropped up recently.  I
> have a gamesystem with an ethernet card in it.  My
> old setup had everything going thru my linux system
> to the internet.  The linux box has a DHCP and
> caching DNS server running and it all seemed to work
> great.  I have had this setup since December of 2000
> and have had to make little modifications to it. 
> Unfortunately, my PS2(the above game system) does
> not seem to like this very much.  The issue is
> unfortunately port forwarding.  To fix this(on a
> temporary basis) I used the router portion of my
> hub(its a linksys cable/DSL router that I bought a
> few years back on the hopes that it would work
> better or at least as well as the linux in routing,
> and save me a few bucks on power.  Unfortunately
> back then, it failed miserably.  However, recently
> with my current problems, I was reading that the
> thing is upgradable by firmware.  I did that and it
> works better.  Rather than fail after a few hrs of
> operation, it lasted about a week before requiring
> powercycling.  My problem is more software and comes
> from the fact that game makers for PS2 don't seem
> very communicative about what ports need to be
> opened in their software for stuff to function
> properly.  The linksys router supports a DMZ host
> which throws the PS2 system on the network
> unprotected.  My question is, is there a way to do
> this in software in the linux box?  I know I could
> probably get 1 more hub, and put the exterior
> connections(the PS2 and the linux box) on it and get
> another IP from comcast.  I don't want to do this
> for my whole network, and it comes from the fact
> that I never could convince my systems that they
> didn't need to go to the internet for local file
> xfers(which I do a lot.)  So, does anyone have any
> idea how to simulate the DMZ portion of the linksys
> router under linux?  Im running a 2.4 kernel(2.4.19
> to be exact.)  Oh, and I'm looking for something a
> bit cleaner than just forwarding every port to the
> PS2.  
> 
> Mike
> 


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