Troubleshooting Tools Overview And Use; Testing Access To Internet Network Hosts - HP -UX 11i v3 Administrator's Manual

Connection
stays up?
YES
Problem still exists?
Report your problem to
HP. See "Reporting
problems " (page

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.
80 Troubleshooting HP APA
3. Transfer a file to a different remote host on the network. Use the
netstat command to check for lost packets.
If network congestion does not appear to be the cause, contact
your HP representative. See
more information.
If the connection terminates abnormally or a network application
appears to hang, complete the following steps:
NO
1. Test the network to determine whether the problem is on the local
host, remote host, or a host on the path between the two.
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
83).
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
"Reporting problems " (page 83) for