Nortel BCM 3.7, Manual

Page: 755 / 1004

PPTP 755
Programming Operations Guide
PPTP offers the following features:
• Support for multiple authentication schemes: MS-CHAP, CHAP, or PAP.
• Support for IP address translation via encapsulation.
• Support for RC4 encryption.
• Support for compression of data packets.
Settings required for PPTP tunnels
The data packets that pass through PPTP tunnels interact with other routing features in Business
Communications Manager. As a result, there are several settings you must make in other features
for PPTP tunnels to operate.
NAT (Network Address Translation)
You cannot set NAT rules on traffic that goes through the PPTP tunnel. You can set NAT rules for
the end points of the PPTP tunnel.
For information about how to change the NAT settings, refer to “Configuring NAT (Network
Address Translation)” on page 737 .
QoS
You cannot set QoS rules on traffic that goes through the PPTP tunnel. You can set QoS rules for
the end points of the PPTP tunnel.
IP Routing
Do not create a static route to the far end of the tunnel. If you do, packets will not be sent through
the tunnel. PPTP sets up the necessary routes when the tunnel is enabled.
Filters
You must set the following parameters in IP Firewall filter programming.
• Allow PPTP protocol under the Protocol field for traffic to and from Business
Communications Manager.
• Allow traffic to and from Business Communications Manager on the PPTP port (1723/tcp).
You cannot set IP Firewall filter rules on traffic that goes through the PPTP tunnel. You can set IP
Firewall filter rules for the end points of the PPTP tunnel.
For information about how to change Filters, refer to “Configuring IP Firewall Filters” on page
819 .