HP-UX LAN Administrator's Guide (Feburary 2007)

DRAFT COPY Troubleshooting HP-UX LAN
Diagnostic Flowcharts
Chapter 5 69
Flowchart 5 Procedures
A. Host entry in ARP cache? Using arp, check that an entry exists for the
remote host in your system's ARP cache. For example, suppose the remote
host is known as 192.6.20.2. Enter:
arp 192.6.20.2
B. Remote host up? If there is no ARP cache entry for the remote host, first
check that the remote host is up. If not, the remote host has not broadcast
an ARP message, and that likely is why there is no entry in the ARP cache.
C. LAN card O.K.? Use lanadmin or nwmgr to ensure the remote LAN card is
operational.
D. Replace or reset LAN card. When the LAN card is operational, use lanadmin
to reset. Refer to the lanadmin command description or sample output in
this chapter.
E. Bring-up remote host. Have the node manager of the remote host bring that
system up.
F. Entry complete? Perhaps there is an ARP cache entry, but it is wrong or not
complete.
G. Use arp to complete entry. Using arp, enter the correct Station Address. For
more information, refer to the arp(1M) man page.
H. ping local host. Using ping, do an internal loopback on your own system. In
other words, ping your own IP address. This will determine if the problem is
on your end.
I. ping successful? If the internal loopback is successful, your system is
operating properly to the Network Layer (OSI Layer 3). In addition, you
know an ARP cache entry for the remote host exists on your system. If this
is true, the network interface or software on the remote host is suspect.
Start again with Flowchart 4, but this time ping from the remote host to
your system.
If the ping was not successful, call your HP representative for help.