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Introduction 84
Models 2603, 2621, and 2635 Getting Started Guide 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.
1
If 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.
2
When NAT is used together with DHCP Relay, the WAN service must be routed.
3
When DHCP Relay is used with a Bridged WAN service, the DHCP server must be on the same subnet
as the clients and the IPLink.
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