ACCESS GATEWAY
74 System Administration
3. To route DHCP through an external server, enable the DHCP Relay.
4. If you enabled the DHCP Relay feature, you must assign a valid DHCP Server IP address
(the default is 0.0.0.0) and a valid
DHCP Relay Agent IP address.
The DHCP Relay Agent allows the Access Gateway to request a specific range of IP
addresses from different IP pools from the DHCP Server. Leaving these fields blank forces
the system to use the IP pool that contains IP addresses that are on the same subnet as the
Access Gateway.
5. If you want the Access Gateway to act as its own DHCP Server (you did not enable the
DHCP Relay), enable it now.
6. If required, you can make the DHCP Server feature Subnet -based by checking the
appropriate box.
7. If required, enable the IP Upsell feature.
System administrators can set two different DHCP pools for the same physical LAN.
When DHCP subscribers select a service plan with a public pool address, the Access
Gateway associates their MAC address with their public IP address for the duration of the
service level agreement. The opposite is true if they select a plan with a private pool
address. This feature enables a competitive solution and is an instant revenue generator for
ISPs. The IP Upsell functionality solves a number of connectivity problems, especially
with regard to L2TP and certain video conferencing and online gaming applications.
You must disable the DHCP server before enabling the DHCP relay. Both
features cannot be enabled concurrently.
If the DHCP Relay Agent IP address is set for an address that is already used or
the IP address of the server, the other system will get an IP conflict and will not
have Internet access.
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