Re: Firewalls, PC static routes, gateways

From: Rodney van den Oever (RvdOeverat_private)
Date: Mon Jan 03 2000 - 17:06:38 PST

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    Randy Witlicki wrote:
    > 
    >    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)
    
    Either:
    
    1. set the default route to the internal router and make sure that one
    has a default route pointing to the inside interface of the firewall and
    has knowledge of other networks within the VPN.
    
    2. Use DHCP anyway and add a batchfile to add a static route. Be aware
    that you can't add static routes via DHCP (at least Windows won't accept
    any). 
    
    Just add some batchfile to the startup-group e.g.:
    
    bash$ cat routeadd.bat
    
    @echo off
    rem DHCP:
    ipconfig /release 0
    ipconfig /renew 0
    
    rem @Work
    route delete 0.0.0.0 mask 0.0.0.0       x.x.x.x
    route add    0.0.0.0 mask 0.0.0.0       10.0.0.1
    route add 172.16.0.0 mask 255.255.0.0   10.0.0.2  
    
    3. If you add a default route to 10.0.0.1 on the VPN-router and you
    enable ICMP-redirects (probably by default enabled), this router will
    send an ICMP-redirect to the clients telling them there's a better path
    to the outside world via 10.0.0.1. This oughta work with Windows.
    
    
    >    - 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 ?
    
    In case the user connects to another network, the batchfile just won't
    work because of the different interface address, but's that no probem.
    
    --
    Rodney van den Oever / PGP Key ID 0x0A6CCE53
    'Hit any user to continue.' - Erich Meijer
    



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