HP Auto Port Aggregation Administrator's Guide HP-UX 11i v3 (766140-001, March 2014)

2. After you identify the host with the problem, do the following:
a. Confirm that the NIC is properly configured. Verify that the
broadcast address and address mask for the local host are
correct.
b. Make sure the local host's /etc/hosts file has the correct IP
address for the local host.
c. Make sure the cabling from the local host to the network is
intact and properly connected.
d. If connected over a local area network (LAN), verify that the
Address Resolution Protocol (ARP) entries are correct and that
the system is properly connected to the LAN.
e. Check the /var/adm/nettl.LOG000 file to see if there are
any errors (for example, cable disconnection messages). Format
the nettl.LOG000 file using the following command:
# netfmt -N nettl.LOG000
Problem still exists?
Report your problem to
HP. See “Reporting
problems ” (page 71).
Troubleshooting tools overview and use
To help you resolve problems with HP APA, the operating system provides tools you can use to
complete the following tasks:
• Test access to network hosts on the Internet
• Scan the system hardware
• Display the nettl log and trace files
• Report problems to HP
The following sections contain information about using the tools associated with these tasks.
Testing access to Internet network hosts
Use the ping command to test your system's ability to reach a host on the Internet network. The
ping command has the following syntax:
/usr/sbin/ping [options] [hostname]
The ping command sends an Internet Control Message Protocol (ICMP) echo request to the host
specified. When the request is successful, the remote host sends the data back to the local host
where is printed to stdout. If the remote host does not respond to the request, the ping command
does not display any results.
To terminate the ping command output, press Ctrl+c. When terminated, the ping command
displays statistics on packets sent, packets received, the percentage of packets lost, and the
minimum, average, and maximum round-trip packet times.
You can use the output from the ping command to help determine the cause of direct and indirect
routing problems such as an unreachable host, a timed-out connection, or an unreachable network.
When using the ping command for fault isolation, first test the local host to verify it is running. If
the local host returns the data correctly, use the ping command to test remote hosts farther and
farther away from the local host.
If you do not specify command options, the ping command displays the results of each ICMP
request in sequence, the number of bytes received from the remote host, and the round-trip time.
If the output indicates lost packets, note the percentage. If you are losing ten percent or more, this
might indicate the network or remote host is extremely busy.
Also note the round-trip transmission times. Periodically high transmission times might indicate the
network or remote host is extremely busy. Consistently high transmission times might indicate the
local host is extremely busy.
68 Troubleshooting HP APA