3Com Switch 7750 Configuration Guide

608 CHAPTER 57: DHCP SERVER CONFIGURATION
The DHCP settings of the 10.1.1.0/25 network segment are as follows:
■ Lease time: 10 days plus 12 hours
■ Domain name: aabbcc.com
■ DNS server: 10.1.1.2
■ WINS server: none
■ Gateway: 10.1.1.126
The DHCP settings of the 10.1.1.128/25 network segment are as follows:
■ Lease time: 5 days
■ Domain name: aabbcc.com
■ DNS server: 10.1.1.2
■ WINS server: 10.1.1.4
■ Gateway: 10.1.1.254
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If you use the inheriting relation of parent and child address pools, make sure that
the number of the assigned IP addresses does not exceed the number of the IP
addresses in the child address pool; otherwise extra IP addresses will be obtained
from the parent address pool. The attributes (for example, gateway) also are based
on the configuration of the parent address pool.
For example, in the network to which VLAN-interface 1 is connected, if multiple
clients apply for IP addresses, the child address pool 10.1.1.0/25 assigns IP
addresses first. When the IP addresses in the child address pool have been
assigned, if other clients need IP addresses, the IP addresses will be assigned from
the parent address pool 10.1.1.0/24 and the attributes will be based on the
configuration of the parent address pool.
For this example, the number of clients applying for IP addresses from
VLAN-interface 1 is recommended to be less than or equal to 122 and the number
of clients applying for IP addresses from VLAN-interface 2 is recommended to be
less than or equal to 124.
Network diagram
Figure 154 Network diagram for DHCP configuration
WINS server
10.1.1.4/25
Client
Switch B
Client
DNS server
10.1.1.2/25
Switch A
DHCP server
Vlan-int2
10.1.1.129/25
Vlan-int1
10. 1.1 .1/ 25
Client Client
Client Client
Vlan-int1
10.1.1.126 /25
Gateway A
10.1.1.254 /25
Gateway B