Network Router User Manual

Chapter 7: DHCP Configuration Guide
72 SmartSwitch Router User Reference Manual
9. Specify a remote lease database on the TFTP server 10.1.89.88.
10. Specify a database update interval of every 15 minutes.
Configuring Secondary Subnets
In some network environments, multiple logical subnets can be imposed on a single
physical segment. These logical subnets are sometimes referred to as “secondary subnets”
or “secondary networks.” For these environments, the DHCP server may need to give out
addresses on different subnets. The DNS server, DNS domain, and WINS server may be
the same for clients on different secondary subnets, however, the default gateway will
most likely be different since it must be a router on the client’s local subnet.
The following example shows a simple configuration to support secondary subnets
10.1.x.x and 10.2.x.x.
1. Define the network parameters for ‘scope1’ with the default gateway 10.1.1.1.
2. Define the address pool for ‘scope1’.
3. Define the network parameters for ‘scope2’ with the default gateway 10.2.1.1.
4. Define the address pool for ‘scope2’.
5. Create a superscope ‘super1’ that includes ‘scope1’.
dhcp global set lease-database tftp://10.1.89.88/lease.db
dhcp global set commit-interval 15
dhcp scope1 define parameters address-netmask 10.1.0.0/16 gateway
10.1.1.1 dns-domain acme.com dns-server 10.1.44.55
dhcp scope1 define pool 10.1.1.10-10.1.1.20
dhcp scope2 define parameters address-netmask 10.2.0.0/16 gateway
10.2.1.1 dns-domain acme.com dns-server 10.1.77.88
dhcp scope2 define pool 10.2.1.40-10.2.1.50
dhcp scope1 attach superscope super1