Domain members not behind firewall can't reach DC

We have a small network containing two Win2000 DCs and workstations in different locations. Due to massive intrusion attacks, we have put the DCs and some workstations behind a firewall (NETgear FR328). The problem is that the domain member computers that are not behind the firewall don't reach the DC. According to Microsoft, I should either open a number of ports on the firewall or use PPTP and GRE 47 protocol. What is your suggestion? How do you use PPTP and GRE in this context? Thanks in advance.
The best solution to this problem is to use a VPN for access. The VPN can be PPTP (which will use GRE) or L2TP/IPsec. You will need to configure Routing and Remote Access Services (RRAS) on a server in the domain and conjure VPN clients. You can use built-in software in Windows clients to create a VPN.
This was first published in October 2003

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