13-13
Dynamic Host Configuration Protocol (DHCP)
Configuring a DHCP Server
Configuring Parent and Child Pools
If your ProCurve Secure Router supports contiguous subnets, you can config-
ure a single parent pool for the range of subnets. In this pool, you would specify
settings that apply to all of the subnets, such as domain name, DNS servers,
WINS servers, and lease time.
You would then configure child pools, each of which would have its own
subnet address and default gateway. The other settings would be automati-
cally imported from the parent pool, saving you time and minimizing oppor-
tunities for miskeying a server address.
When you configure a parent pool, you specify the range of subnets by entering
the network address bits the subnets have in common followed by the (now
shorter) prefix length.
Figuring out the exact number of bits that two subnets have in common
involves converting from decimal to binary and can be complicated. The
simplest method is to use the address and bit length for the last common octet.
For example, you want to configure a parent pool for subnets 192.168.1.0 /24
and 192.168.2.0 /24. The parent pool network address could be 192.168.0.0 /16.
However, you should be careful using this method, especially when your
network uses variable-length subnets.
Figure 13-3. Example DHCP Pool Configuration
192.168.1.0 /24
Gateway
192.168.1.1
192.168.2.0 /24
Gateway
192.168.2.1
192.168.0.0 /16
DNS servers
WINS servers
Lease
Router A
LAN 1
192.168.1.0 /24
LAN 1
192.168.2.0 /24
Parent pool
Child poolChild pool
WINS
server
DNS
server
DNS
server
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