Wireless/Redundant Edge Services xl Module Management and Configuration Guide WS.02.xx and greater

Table Of Contents
6-23
IP Services—IP Settings, DHCP, and DNS
DHCP Server
As a DHCP server, the Wireless Edge Services xl Module can also implement
dynamic DNS (DDNS), which updates a DNS server whenever a host’s IP
address changes.
Finally, the Wireless Edge Services xl Module supports DHCP relay.
Configuring the DHCP Server
If you want the Wireless Edge Services xl Module to assign IP addresses to
devices on your network, you must configure it as a DHCP server by following
the steps outlined in the following sections. You can access all of the options
necessary to configure the DHCP server from the Network Setup > DHCP Server
screen in the Web browser interface.
To run the DHCP server on a VLAN, the VLAN must meet these requirements:
It must have a static IP address. (See “Assigning an IP Address to a VLAN”
on page 6-5.)
It must not implement DHCP relay.
DHCP relay configurations take precedence over the DHCP server. In
other words, if you associate a VLAN interface with a network pool and
you also implement DHCP relay on that interface, the module does not
respond to DHCP requests on that VLAN. Instead it relays requests to an
external server.
After configuring the DHCP server, you must enable it. If the server is already
enabled, any configurations you make to it take effect only after the server
restarts. The DHCP server automatically restarts 30 seconds after you apply
a change. You can also manually restart the server.
Creating DHCP Pools
As a DHCP server, the Wireless Edge Services xl Module requires one or more
pools from which to issue configurations to devices. You can configure either
a network pool or a host pool.
A network pool includes a range of IP addresses from which the DHCP server
can choose as it responds to DHCP requests. The Wireless Edge Services xl
Module associates each network pool with a particular VLAN. When a station
in that VLAN sends a DHCP request, the module responds with one of the
addresses from the associated pool.