Specifications

8-27
TCP/IP Network Characteristics
Figure 8-1 shows what occurs when the access server acts as a DHCP client:
Figure 8-1. Access Server as a DHCP Client
DHCP Proxy Operation
The access server can act as a DHCP proxy to provide IP address assignment for
most remote clients.
IP Address Assignment
When you enable DHCP, the access server sends requests for IP addresses to a
DHCP server on behalf of the remote client if:
• You do not configure an IP address on the ports configured for remote access.
• You do not specify an IP address using RADIUS authentication.
• The remote client is not configured with an IP address for its PPP session.
When the access server receives the IP address from the DHCP server, it assigns
the address to the remote client.
Figure 8-2 shows what occurs when the access server uses DHCP to assign IP
addresses to remote clients:
Access Server
(DHCP Client)
1. Requests
IP configuration
parameters
(IP address not
requested).
3. Receives
acknowledge-
ment; operation
complete.
2. Receives
request and
sends packet
with IP
configuration
information.
DHCP Server
LKG-10495-fh8