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provides information on the associated servers. Configuring a Secondary or
Tertiary server is optional.
6
Enter the DHCP Cache Size. This is the number of IP addresses that is held
in the VPN Router cache. The minimum number of IP addresses held is one
(1), and the maximum is derived from the maximum number of tunnel
sessions that the VPN Router supports.
7
Click Immediate Address Release if there are a limited number of available
IP addresses and you want the VPN Router to release the IP address back to
the DHCP server immediately. IP addresses from disconnected tunnel
sessions remain unavailable for the time you specify (300 to 7200 seconds).
This delay prohibits immediate reuse by another user that can represent a
security risk.
8
For DHCP Blackout Interval, enter the amount of time in seconds that a
DHCP address is held in a blackout state before it is returned to the DHCP
server or the DHCP cache.
9
Click Override Blackout Interval when no addresses are available to
enable this option.
To add a user IP address pool:
Select Servers > User IP address.
1
2
Click Add to add a new address pool.
3
Enter the starting IP address and ending IP address for this pool. Make sure
that none of the pool addresses are the same as those used for the LAN
interfaces or the management interface IP address. The VPN Router does not
check the IP address supplied by a PPTP client to see if it is assigned to a
LAN interface, management interface, or address pool.
The Use Client-Specified Address option is disabled by default. To avoid
potential conflicts, you can verify the current state of this option from the
Profiles > Groups > Edit > Configure PPTP window.
4
Enter the Subnet Mask for the pool that you are configuring. You can later
edit the Subnet Mask as necessary.
5
Beside Pool, click Default and enter the name of the pool. The name must
match the group profile for either DHCP or for a local address pool.
Nortel VPN Router Security — Servers, Authentication, and Certificates
Chapter 2 Configuring servers 61
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