Configuring the DSL Router
3-8
6371-A2-GB20-10
August 2000
H When the DHCP IP address range is changed, all binding entries,
automatically added routes, and ARP table entries for the clients configured
with the old address range are removed.
H When the DHCP Server is enabled, there can be only one service domain
(Ethernet interface) configured.
H The IP address for the next hop router that is provided to the hosts in the
DHCP reply must be configured.
H The subnet mask can be configured along with the IP address range
(optional).
H The DHCP server domain name can be configured (optional).
H The Domain Name Server (DNS) IP address can be configured (optional).
H The minimum and maximum lease time settings can be configured.
For additional information, refer to Chapter 4,
DSL Router Configuration
Examples.
DHCP Relay Agent
The DSL router provides the capability of serving as a DHCP Relay Agent, as
specified in RFC 2131, Dynamic Host Configuration Protocol. The DSL router
provides the capability to enable and disable the DHCP Relay Agent and to
configure the IP address of the DHCP server to which the DHCP requests are to
be forwarded.
The DHCP server assigns an IP address to the end-user system. When DHCP
Relay is enabled, it is possible to limit the number of DHCP clients. The DSL
router’s IP Routing table and ARP table are automatically updated. The DHCP
relay agent in the DSL router should be used when there is a DHCP server
upstream in the service domain. DHCP relay agent setup considerations:
H DHCP server IP address must be configured.
H DHCP relay must be enabled.
H The number of DHCP clients can be limited to 1—256.
H DHCP server and DHCP relay functions cannot be enabled at the same time.
H NAT and DHCP relay cannot be enabled at the same time.
