I have a Site to Site IPSec VPN up between two sites. On my understanding all IP ports are open, and ip helper-address command had been added to config on both sides. Remote Windows clients are not able to register with Windows 2003 domain controller. What should I verify in Cisco routers? WINS ? NBT ? DHCP? TCP/UDP Ports ? I know the VPN is up because there are two Avaya PBXs communicating through the link, also any side to side ping, telnet, ftp try works properly.
Thanks in advance