problem with ISA Routing between internal networks

[overdraft015]

Not sure if im barking up the wrong tree here with ISA but here goes.

corporate have a global network which we are part of. they allocated us an ip range for us to use. now we need to move away from the corporate domain and implement an independant one but we still need to stay connected for a time being for some resources.

I need to setup a LAN with WAN access but i need to be able to also route through the corporate network which is still here. My idea was to implement an ISA server (we have 2004) with 3 NICs:

1 WAN - Real IP
1 LAN - 192.168.86.0/24
1 Corporate LAN - 192.168.21.4 (corporate have defined this as the gateway for the 86.0 network)

can ISA do routing between the two LANs and allow the LAN access to the WAN still? btw the WAN and Corporate LAN are in no way connected (i.e. not on the same modem/router)

or is routing and remote access the way to be going?

hope i was clear and any help is appreciated, thanks.

Michael.

It's not what you know. It's who's on Tek-Tip's

 

[overdraft015]

i have attached a network diagram of what i think the result should be. the reason we need to keep the 21.0 network is because the router between us and corporate is on that and they wont change that. and some users need to work on the 21.0 network for the time being.

thanks.

http://www.mediafire.com/imageview.php?quickkey=ojxdjgnyyjz

It's not what you know. It's who's on Tek-Tip's