Enterasys Networks 9034313-07 manual Configuring a Dhcp Server

DHCP Overview

address, the MAC address to which it is assigned, the lease expiration, and whether the address assignment is dynamic (automatic) or static (manual). The DHCP lease database is stored in flash memory.

In addition to assigning IP addresses, the DHCP server can also be configured to assign the following to requesting clients:

•Default router(s)

•DNS server(s) and domain name

•NetBIOS WINS server(s) and node name

•Boot file

•DHCP options as defined by RFC 2132

Note: A total of 16 address pools, dynamic and/or static, and a maximum of 256 addresses for the entire switch, can be configured on the SecureStack C3.

Configuring a DHCP Server

For DHCP to function on SecureStack C3 systems, the system has to “know about” the IP network for which the DHCP pool is to be created.

On the C3, there are two ways to configure a DHCP server: one is to associate the DHCP address pool with the switch’s host port IP address, and the other is to associate the DHCP address pool with a routed interface.

Since on a C3 system, the host port IP address cannot fall within a configured routed interface on the system, a typical C3 system configured with routing interfaces will not have a host port IP address. Therefore, all DHCP pools would be associated with routed interfaces.

The following tasks provide basic DHCP server functionality when the DHCP pool is associated with the system’s host IP address. This procedure would typically be used when the C3 system is NOT configured for routing.

1.Configure the system (stack) host port IP address with the set ip address command. Once the system’s IP address is configured, the system then “knows” about the configured subnet. For example:

set ip address 192.0.0.50 mask 255.255.255.0

2.Enable DHCP server functionality on the system with the set dhcp enable command.

3.Configure an IP address pool for dynamic IP address assignment. The only required steps are to name the pool and define the network number and mask for the pool. Note that the pool has to be in the same subnet and use the same mask as the system host port IP address. For example:

set dhcp pool auto-pool network 192.0.0.0 255.255.255.0

All DHCP clients served by this switch must be in the same VLAN as the system’s host port.

The following tasks provide basic DHCP server functionality when the DHCP pool is associated with a routed interface.

1.Create a VLAN and add ports to the VLAN. Only DHCP clients associated with this VLAN will be served IP addresses from the DHCP address pool associated with this routed interface (VLAN). In this example, VLAN 6 is created and ports ge.1.1 through ge.1.10 are added to VLAN 6:

set vlan create 6

16-2 DHCP Server Configuration