Installing HP-UX 11.0 and Updating HP-UX 10.x to 11.0 HP 9000 Computers Edition 1

212 Appendix A
Configuring for a DHCP Server
Setting Up a DHCP Server
• When a system boots for the first time (either after a Cold Install, or
the first boot of a pre-loaded (Instant Ignition) system):
The auto_parms tool, that lets you configure the system identity and
basic configuration parameters, will invoke the dhcpclient, which
will broadcast out to find a DHCP server. The server, in turn, provides
a default set of networking parameters.
In both cold install and a first boot of a pre-loaded system, if the user
chooses not to use the IP address given by the DHCP server, the tool
will inform the DHCP server that it can release the lease on it and
give it to someone else.
• At each system boot:
If a client system was initially set up using an IP address that was
leased by a DHCP server, that client will check to ensure that the
lease is still valid at each boot. In addition, the system will start a
daemon process (dhcpclient -m) that will maintain and renew that
lease while the system is running.
If a system cannot contact the DHCP server from which it originally
got the IP address lease, it will try to contact other DHCP servers in
order to determine if it has been moved to a different network. If this
is the case, the system will write a message to the auto_parms log
file (/etc/auto_parms.log) indicating that it has detected a move
to a new subnet and that it is attempting to request a new lease. If
the new lease request is successful, new networking configuration
values supplied by the DHCP server will automatically be applied.
Enabling DHCP on a
System Not Initially
Configured with DHCP
If a system has been set up without using DHCP, but you would like to
start using it, the following steps may be taken.
NOTE The system's hostname and IP address may change based on what the
DHCP server assigns to it the first time it boots.
There are two methods for enabling DHCP on a system that is not
currently using it:
1. The first method is to use SAM.
a. As root, run sam.
b. Double-click Networking and Communications.
c. Double-click Network Interface Cards.