DHCP Relay/BOOTP Question

Hey guys,

Hopefully someone can help me out here...

Basically were out of IP's quickly on our current subnet (192.168.20.30) and I need to something about quickly before its gets too bad.

Now for quick overview of our setup:

In the server room I have 2x PC 6248 uplinked (192.168.20.35). All of out servers are connected into these switches and run on the same 192.168.20.x subnet. We have a Watchguard which acts as gateway (192.168.20.30) for the subnet and as such it does all the routing of offsite warehouse and whatnot. The DHCP server for the subnet runs on the Domain controller which is 192.168.20.13

 

Now I have a section of the warehouse where roughly 40-50 clients end up passing through whether it be by LAN or Wireless (the AP's connect into that switch) The switch is a PC6224 (192.168.20.36), I was thinking if I could somehow get everything that runs through this switch onto a new subnet (192.168.15.x) then it would solve my issue.

 

Well I'm having or sorts of issues with this, now I'm not at all qualified in this area, but were in the middle of network admins atm, so I'm left with the issue..

 

So I was thinking that If I setup a new DHCP server scope on DHCP server and then setup the warehouse switch with DHCP relay/BOOTP then anything that plugs or passes through that switch should get its IP from that secondart DHCP server..

 

Now I know I'm wrong as I've tested it and its now good, anytime I plug something into that switch it still gets 192.168.20.x IP...

 

What am I doing wrong