pptp and internet problem

By saeed_master2002 ·
hi. I have an office with some branches. I want to make a connection between them. so I use a 2821 at main office as VPN server and use microsoft client(XP) at remotes. the remotes can access my LAN thorough PPTP tunnel but the problemis that my users in my LAN at main office can not access internet thorough the 2821. please help me

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Check your port numbers and firewall settings

by hlhowell In reply to pptp and internet problem

According to Microsoft, at

Using PPTP with Firewalls and Routers

PPTP traffic uses TCP port 1723, and IP protocol uses ID 47, as assigned by the Internet Assigned Numbers Authority (IANA). PPTP can be used with most firewalls and routers by enabling traffic destined for port 1723 to be routed through the firewall or router.

Firewalls ensure corporate network security by strictly regulating data that comes into the private network from the Internet. An organization can deploy a PPTP server running Windows NT Server version 4.0 behind its firewall. The PPTP server accepts PPTP packets passed to the private network from the firewall and extracts the PPP packet from the IP datagram, decrypts the packet, and forwards the packet to the computer on the private network.

The information contained in this document represents the current view of Microsoft Corporation on the issues discussed as of the date of publication. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information presented after the date of publication.

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