System information

Chapter 4. HMC Guided Setup 119
The HMC provides DHCP services to all clients in a private network. These clients will be
our managed systems and other HMC’s. You can configure the HMC to select one of
several different IP address ranges to use for this DHCP service, so that the addresses
provided to the managed systems do not conflict with addresses used on other networks
to which the HMC is connected.
We have a choice of standard nonroutable IP address ranges that will be assigned to its
clients. The ranges we can select from are:
– 192.168.0.2 - 192.168.255.254
– 172.17.0.3 - 172.16.255.254
– 172.17.0.3 - 172.17.255.254
– 10.0.0.2 - 10.0.0.254
– 10.0.128.2 - 10.0.143.254
– 10.0.255.2 - 10.0.255.254
– 10.1.0.2 - 10.0.143.254
– 10.1.255.2 - 10.0.255.254
– 10.127.0.2 10.127.15.254
– 10.127.255.2 10.127.255.254
– 10.128.0.2 - 10.128.15.254
– 10.128.128.2 - 10.128.128.254
– 10.128.240.2 - 10.128.255.254
– 10.254.0.2 - 10.254.0.254
– 10.254.240.2 - 10.254.255.254
– 10.255.0.2 - 10.255.0.254
– 10.255.128.2 - 10.255.143.254
– 10.255.255.2 - 10.255.255.254
– 9.6.24.2 - 9.6.24.254
– 9.6.25.2 - 9.6.25.254
The 9.6.24.2 - 9.6.24.254 and 9.6.25.2 - 9.6.25.254 ranges are two special range of IP
address that can be used to avoid conflicts in cases where the HMC is attached an open
network which is already using nonroutable addresses.
The HMC LAN adapter will be assigned the first IP address out of the range selected. In
our example, we select the 192.168.0.2 - 192.168.255.254 range, so our HMC will be
given IP address 192.168.0.2. Any other client (HMC or managed system) will also be
given an address from this range.
The DHCP server in the HMC uses automatic allocation, which means that each managed
system will be reassigned exactly the same IP address each time it is started. The DHCP
server uses each client’s built in Media Access Control (MAC) address to ensure that it will
reassign each client with same IP address as before. When a managed system starts, it
will try to contact the DHCP service to obtain its IP address. If the managed system is
unable to contact the HMC DHCP service then, the managed system will use its last given
IP address.
We select the range 192.168.0.2 - 192.168.255.254 and click Next to continue.