You might view this as "cascaded firewalls" or "cascaded NAT" - for which
you can search and read things...

My experience with a similar arrangement is that the ISP router is right
where you want it. It will get its external (real internet) IP address from
the modem/ISP so that won't be specified by you unless maybe you have a
static IP address from the ISP. It will provide internal IP addresses most
likely in the range 192.168.1.2 to 192.168.1.254 with 192.168.1.1 assigned
to the router on the internal side.

The server would then have IP address on the external side of 192.168.1.2 or
above...
The server would be on an internal IP address range of maybe
192.168.2.1-.254 with the router having 192.168.2.1 and the computers on the
LAN from .2 to .254
We have WinProxy on server/firewalls like this. It was quite painless to
add the router on the outside of the server - just an IP setting / address
change for the server's outside interface.

You may wish to show the ISP DNS server addresses as well as the
server/firewall for DNS on the LAN computers.

You really only need DHCP enabled on the inside of the server/firewall to
have DHCP on the LAN.

If there aren't many computers on the LAN, then you might switch the order
of the router and the server just to save having a switch on the inside of
the server. But that seems an unlikely driver for the architecture.

Fred

"Al" wrote in message
news:9Bh7d.141066$Np3.5979226@ursa-nb00s0.nbnet.nb.ca...
>I am trying to set up a wireless router into our existing network at work.
> Here is the current setup:
>
> MODEM
> |
> ROUTER (supplied and configured by ISP)
> |
> SERVER (firewall, dns)
> |
> SWITCH--uplink---SWITCH
> | |
> PC's PC's
>
> I was wondering where the router should go? (i was thinking between server
> and switch)
> Also will this router interfere with the other router supplied with my
> ISP?
> How should I configure this router (local IP etc)? I have heard that any
> routers added should have a new range of addresses ex. If the ISP router
> was
> giving out 192.168.2.XXX addresses then the router should be setup with a
> 192.168.2.XXX address but it should assign 192.168.3.XXX addresses to the
> computers hooked up to it.
>
> Any input would be appricated. Also any links to websites would be
> helpful.
> Most web sites I find give you tutoorials on basic setup (1 router and
> nothing else)
>
> Thanks in advance
>
> AL
>
>
>