linux as router/firewall questions

[Kirby Clements]

I have a question with using linux as a router. Is it possible to have 
the router/firewall linux box connected to an actual phone line, where 
a 56K connection would be established, having the linux router dialout, 
establish a connection, and then provide that connect via a switch on 
the other side of the linux router. I have read the urls on this issue:

http://www.europe.redhat.com/documentation/HOWTO/Firewall-HOWTO-6.php3
http://www.europe.redhat.com/documentation/HOWTO/Diald-HOWTO-8.php3
and am about to give it a shot.

To better explain, here is the example:
phone line/wall   ----->   linux router w/ 56K modem w/connection  
----->  an ethernet connect from linux/router to Tiger Switch  ---->
switch providing ethernet connect to about 20 machines, all windows 
boxes, mostly NT and 2 NT servers running mail and Exchange, IIS. 
Running the network essentially, so I got to be careful what I block 
obviously. And all the windows boxes are using 192 addressess, which 
might make things harder or easier. I don't know yet.

I presume using diald, pppd, and either PAP or CHAP, both configured?   
 Secondly, do windows boxes have any issues communicating with a linux 
router/firewall? The linux box used for this possible scenario is a 
mighty 200 MHZ with 64 RAM. There would be no X on the box, to speed 
things up. I must say though, it has been a while since I even thought 
about dialout anything.

Thanks for any help on this issue.

Kirby

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