Re: Firewall and gateway problems with a game

From: RobN8r (robnator@vvvvv.org)
Date: 03/13/02 

Date: Wed, 13 Mar 2002 14:53:27 -0800
From: robnator@vvvvv.org (RobN8r)

Fredrik,

It's the last bit from Wolfgang below that will shut you down - dynamic
port allocation in a wide range of port numbers. A lot of games do this
for multiplayer networking, and it's hell for a firewall like yours. You
could write a fairly complex script for your box to add the ports
requested by the game to your iptables list and remove them when finished,
but that's a bit of work.

Most people just go around the firewall when hosting <Danger Will
Robinson!> or buy hw firewalls that support dynamic port allocation.

Hope this helps!

Cheers,
RobN8r

In article <a5uje1$a5q$1@news.shlink.de>, Wolfgang Kueter
<wolfgang@shconnect.de> wrote:

> Fredrik Hellman wrote:
>
> > Hello!
> >
> > I have set up a firewall and a gateway on a Linux-machine. I can use
> > it to browse the web, fetch mail, play Half-Life, Empire Earth and so
> > on.
>
>
>
> > I can join remote hosted games in both Half-Life and Empire earth. I
> > have two other games: Sudden Strike and Europa Univeralis II. I can't
> > join any of my friend's set up games. I think it is because of my
> > gateway.
> >
> > Do you have any advice? Thanks in advance
>
> Look the the rules
>
> iptables -L
>
> log all traffic that you don't allow.
> Look at the logfile, allow communication according to log entries.
>
> man iptables
>
> Actually a packet-filter hardly makes sense if you want to play games,
> since these normally need a wide range of ports to be open and
> dynamically open new ports.
>
> Wolfgang

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