Current situation: adsl light by kpn. Ethernetmodem config: Thomson 510, No DNS-config, no DHCP-config. Software install. from cd for only 1 machine using the ethernet modem. Ethernet modem connected to wan-router. WAN-Router connected to 1 Switch and 1 Hub. Connected to Switch at 10-100Mb/s Local domain: DC config: 192.168.X.X subnet mask 255.255.X.X Prim. dns: addres of router Altern. dns: address of DC1 Gateway: address of Router Wins: address of DC1 DC1 is dhcp-server1, router is DHCP-server2. Config WS: prim. dns: address router. Altern. dns: address DC1 Gateway: address router Wins: address DC1 DC1 configured with local AD-domain mydomain.local, with WS configured in that domain. DC1 as Exch.2000 server, configured in DNS, works fine only locally. Due to restrictions of ISP i cannot utilize ISA in a regular manner. Because ISA restrict all domain communication from WS to the Internet strictly through the by ISA re-configured DC1 as a gateway. Connected to Hub: WS at 10Mb/s. Question: Is mac address cloning on the router an option to use with ISA to keep the domain operational? How should i proceed?