Introduction 84
Models 2603, 2621, and 2635 User Manual 8 • DHCP and DNS Configuration
Some comments on figure 4.
Routed means a ‘routed WAN service’ and Bridged means a ‘bridged WAN service.’
DHCP Server and DHCP Relay cannot be used simultaneously.
NAT can be used only if a Routed WAN service is configured.
1If a DHCP Server were used with a Bridged WAN service, the DHCP server would respond to IP address
requests from both interfaces, that is, the Ethernet and the WAN serial interfaces.
2When NAT is used together with DHCP Relay, the WAN service must be routed.
3When DHCP Relay is used with a Bridged WAN service, the DHCP server must be on the same subnet
as the clients and the OnSite.
DHCP Server
Go to the DHCP Server webpage from the Configuration Menu --> Services Configuration --> DHCP Server.
The DHCP server default is disabled. Click on the Enable button to begin the configuration process.
Table 4. Features and services matrix
The feature in this column [...] with (Column 1 feature)
Configured
Feature
Cannot be
used
Must be
used Usually used Can be used Rarely used
DHCP
Server
DHCP Relay Routed,
NAT Bridged
1
DHCP
Relay
DHCP Server Routed NAT
2
Bridged
3
DNS Relay Routed,
DHCP Server
or
DHCP Relay
Bridged
NAT Bridged Routed DHCP Server,
DHCP Relay,
DNS Relay
DHCP Cli-
ent
(WAN
side)
Routed
Static IP
(WAN side)
Routed