Subnet: 192.168.0.0/21 (192.168.0.0 thru 192.168.7.254)
Subnet mask: 255.255.248.0
Default gateway: 192.168.1.1
DNS: 192.168.1.15, 192.168.1.59 Forwarders: Neustar
DHCP range: 192.168.4.2 - 192.168.5.254
The main Windows server (.15) does DHCP. If it goes down for any significant length of time, enable DHCP on the Untangle box. It uses separate segments (.6 and .7) so won't eff up existing leases.