Hi folks.

At work we use the 10.x.0.0/16 subnets for our different sites such that
10.1. = Leeds
10.2. = Doncaster
10.3. = Crewe
10.4. = Castleford
etc.

We now need to configure a dial-on-demand ISDN router and configure it to dial 
out on seeing traffic for 6 different subnets - all to the same phone number.

So far so good, no real problems so far.

The problem is that one of the remote subnets is 10.1.0.x/24.  Luckily I don't 
use 10.1.0.X at Leeds, as we start with 10.1.1.1. 

The question is, how can I configure a route for 10.1.0.x/24 to go down the 
router, without buggering up 10.1.x.x/16

One possible solution is ARP proxying (I think that's what it's called).  For 
the subnets that don't cause a problem I can use static routes without a 
problem.  For the IP addresses 10.1.0.0/24 I would like the firewall to 
respond to all ARP requests by supplying it's own MAC address; and then 
forward all appropriate IP traffic down the ISDN line.

Is this possible and if so how do I do it?  I'll probably be using either 
Smoothwall, IPCop, or a slimmed down RH7.3 setup.

-- 
Gary Stainburn
 
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