Firewalls, PC static routes, gateways

From: Randy Witlicki (randy.witlickiat_private)
Date: Sun Jan 02 2000 - 15:44:09 PST

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       Hello,
    
       I'm wondering if anybody has come up with a reasonable
    solution to static routes for Windows 95/98/NT laptop users
    in networks with a firewall and *another* gateway.
       If we have a setup where:
        - The default route points to the firewall on the local
    network, and;
        - You need an additional route to point to a gateway for
    some private network (either via VPN or a private (leased line
    or frame relay) link).
        (e.g.: the route to 0.0.0.0 is 10.0.0.1 and the route to
    172.16.0.0/16 is 10.0.0.2)
    
       Specific problems I have run into include:
    
       - With a PIX firewall, even you don't mind having packets
    bounce off the PIX inside interface, it won't let you.  If you
    have a "route inside" statement, you get an error of the form:
        106011: Deny inbound (No xlate) tcp
             src inside:X.X.X.X/1047 dst inside:Y.Y.Y.Y/23
         Which is the PIX's way of saying it refuses to receive a
    packet on the inside interface and resend it to a gateway
    on the inside.  So you need a route on each host inside.
    
       - If you have a "route add" in a startup .BAT file on a 95 or
    98 PC or a "route add -p" on an NT PC, if it is a laptop and that
    laptop travels to the remote network the "route add" is pointing
    at, then you need a .BAT file to reverse the startup .BAT file.
    I assume you might have similar problems with a *nix laptop.
        Is there a way to get one of these systems to listen to
    RIP or something similar ?
        I think I can do this with DHCP, but at least one of the
    networks involved is very small and it would be nice to avoid
    having to to setup a DHCP server (and having one more server
    piece to depend on).
    
       Thanks in advance for any advice and help !
    
        - Randy
       -
    



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