Installing and Administering LAN/9000 Software

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The value 2 for the ndd parameter ip_pmtu_strategy is no longer
supported. This was previously the default value for this parameter. The
new default value for ip_pmtu_strategy is 1, which causes the system to
use the HP-UX 10.20 IP PMTU behavior. If the nddconf file has the value
2 for this parameter, the new default value (1) will be used.
A description of the IP PMTU strategy is provided in the ndd online help
facility.
Virtual IP (VIP) Addresses
Systems can have Virtual IP (VIP) addresses--addresses that are not
permanently assigned to a single, specific physical interface. The system
will accept to a packet addressed to its VIP (or VIPs) regardless of the
physical interface on which it was received. This allows a system to have
a "system IP" address that is available as long as one interface stays
usable.
To configure VIPs, associate the VIP address with a secondary loopback
interface (lo0:n, where n is 1 or greater, such as lo0:1). The VIP address
does not have to be inthe same subnet (or network) of the addresses used
for the physical interfaces.
In the example below, the system has two LAN interfaces. One is
attached to the 15.n.n.n network and has the address 15.1.1.1. The
second LAN is attached to the 16.n.n.n network and has the address
16.1.1.1. The VIP address is 17.1.1.1.
Figure 1
15.1.1.1
lan0:0
VIP
(no physical interface)
15.n.n.n net
16.n.n.n net
16.1.1.1
17.1.1.1
lan1:0
1o0:1