ISA – Having VPN Problems

my isa is connected to my domain and the internet with 2 nic cards. no DHCP or DNS on domain.

i configured the domain nic with no gateway and the internet nic with ip, gateway, and dns.

if i add my domain gateway then my vpn works but the local internet stop brownsing.

if remove my domain gateway from my network nic the the internet works and the vpn stops.

help
peter