Installing and Administering Internet Services

Chapter 6 267

Dynamic Host Conﬁguration Protocol (DHCP)

Conﬁguring DHCP

This section contains information needed to conﬁgure DHCP servers to

distribute IP addresses to client groups, individual clients, and all clients

via a BOOTP Relay Agent.

Before conﬁguring the DHCP server, you must set up the broadcast

address and set aside a block of addresses for DHCP server to distribute.

Setting Up the Broadcast Address

Before starting the server, you must set the broadcast address for the

lan0 interface name if ifconfig requests it. You can do this either

manually or through SAM.

Changing the Address Manually

1. Issue the command ifconfig lan0 broadcast 255.255.255.255.

2. Issue the command /etc/rc.config.d/netconf.

3. Edit the BROADCAST_ADDRESS variable for lan0 to 255.255.255.255.

Changing the Address Using SAM

1. Start SAM. You must be root user to access SAM.

2. Double-click the Networking and Communications icon.

3. Double-click the Network Interface Cards icon.

4. Go to Advanced Options and set the broadcast address to

255.255.255.255.

5. Click OK and exit SAM.

If there is more than one LAN interface, each must have a broadcast

address of 255.255.255.255.

Preparing to Conﬁgure a DHCP Server

Only one DHCP server is allowed per network.

1. Set aside a set of IP addresses that is currently unused (preferably a

contiguous block of addresses).