[aclug-L] Re: Firewall Question

[Steven Saner <ssaner@xxxxxxxxxxxxxxx>]

What kind of firewall are you using? If it is ip-chains which comes
with most Linux distributions, you do not need to restart the firewall
each time you make a ppp connection. With IP chains you create rules
based on an interface. For your dialup, you would specify the ppp0
interface. This way, regardless of what ip address you get, the rules
you apply to the ppp interface will apply. You might want to look at
the IP-CHAINS HOWTO for more information.




On Sat, Feb 03, 2001 at 03:18:12PM -0600, Carl B. Davis wrote:
> 
> Greetings,
> 
> I have a pppd internet dial up connection, set up for what used to be
> Southwind.  It dials on demand.  I now have a firewall setup that will
> close open ports, and deny access to anyone not on my network.  The
> thing is, because I have a dynamic ip address that changes each time I
> connect, the firewall has to be re-started each time the demand dial up
> connection is initiated.  The explanation I have says to start it with
> the same script that begins the internet connection.  I have tried to
> put it in the "options" and "southwind.chat" files that are used by
> pppd, but that just produces errors.  I also tried putting it in
> ip-up.local and ip-up, with no success.
> 
> Question, how can I set this up to start the firewall after my dial up
> is handed it's ip address from the isp?
> 
> Thanks for your suggestions.
> 
> Carl
> 
> 
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