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I have a question concerning two AD sites thru a VPN. We will be using W2k's RRAS Demand on Dial for the VPN connection. Both RRAS boxes will be behind a firewall. Besides allowing PPTP packets to pass thru between these two connections, what other ports are necessary in order to allow all Active Directory functions to work properly between the two sites (i.e. joining workstation, ldap queries, kerberos, replication, etc.).
This is an easy one, thanks to excellent systems architecture. Because your RRAS VPNs are behind the firewalls, all those complicated protocols you mentioned are contained within the PPTP tunnel. So, the firewall only needs to allow PPTP forwarding.