New Installation confusion



I am new to ISA 2004, I have used a ISA 2000 server before but i did not
istall it.
Basically:

My network is a part of the local council network. We have a 10mb line from
the council, which comes into our network via a router and then goes
straight into a cisco router which is our gateway, then into our main fibre
switch. All the clients look to as the cisco router as the default gateway
(i think). Our network is a 172.18.x.x address, Default Gateway is
17.18.251.254. I cannot change the network ID's as we are subnetted from the
local council.

How should i configure the IP address of the two NIC's or should i stick
with one NIC as the council are providing (Firewall higher up the WAN)

So if the external nic goes into the cisco router, waht ip address will it
be? Shall i see what the router gives it or can i give it any old address?
Trouble is will the router assign one? I have no control over this router
and if it assigns a ip address how do i know it is not being used at tthe
council already.
Don't know if this makes sense but,

I can't ping the router, i get no reply
I can't ping the default gateway, I get no reply


.



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