Nortel BCM 3.7, Manual

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756 PPTP
N0008589 3.3
IP Addresses and DHCP Server
Ensure that the IP addresses for the LAN interfaces, WAN interfaces, dial up links, and PPTP
tunnels are unique across all sites. This simplifies configuration, eliminates conflicts due to NAT,
and prevents the addresses assigned by the DHCP server from conflicting with the IP addresses of
subnets in remote sites.
For information about how to change the DHCP Server settings, refer to the DHCP section.
DNS Server
We recommend the following configuration if you are using a DNS Server:
• Choose one of the offices to act as the primary office. The server in primary office must have a
dedicated link to the Internet.
• Make the server in the primary office the primary domain server. Ensure the DNS Server in the
primary office contains all of the entries for allow the branch offices.
• Configure the DNS Servers in the branch offices to run in cache mode only. Allow a larger
time out value on the branch DNS servers to accommodate for on-demand setup of PPTP
tunnels to the primary office.
• Configure the branch DNS servers to forward DNS Server requests to the Internet Service
Provider first and then to the DNS Server in the primary office.
For information about how to configure the DNS proxy service on Business Communications
Manager, refer to the
“Configuring DNS” on page 707 .
Changing the PPTP settings
The settings of the PPTP Summary screen apply to all of the PPTP tunnels created.
To change the PPTP settings:
1
On the navigation tree, click the Services key and click the VPN key.
2 Click the PPTP heading.
The PPTP Summary screen appears.
3 Configure the PPTP Summary settings according to the following table.
Table 218 PPTP Summary settings
Attribute Description
Description Displays the name of the PPTP service.
This is a read only attribute.
Version Displays the version number of the PPTP service.
This is a read only attribute.