# arp hostname

Host known?

YES

Host reachable?

YES

1.Ensure that the network devices are configured properly on the local host, using the netstat -icommand.

2.Verify that the routing tables on the local host are correct, using the netstat -rcommand.

If a host is not known, the following message is displayed:

unknown host

Complete the following steps:

1.Verify that the user is trying to reach the remote host using a valid host name.

2.Verify that the remote host is in another name domain and that the user specified the full domain name.

3.If your site uses the Domain Name System (DNS) for name-to-address translation, look in the /etc/nsswitch.conf file to see if nis is specified as a service for the hosts database entry. If it is not, add it. Also, verify that the DNS service has information about the remote host.

4.If your site uses the NIS name service for name-to-address translation, look in the /etc/nsswitch.conf file to see if nis is specified as a service for the hosts database entry. If it is not, add it. Also, verify if the NIS service has information about the remote host.

5.If your /etc/nsswitch.conf file lists files as the only name-to-address translation mechanism, the /etc/hosts file does not have information on the remote host. See nsswitch.conf(4) for more information.

If a remote host is not reachable, the following message is displayed:

host is unreachable

Complete the following steps:

1.Inspect the cabling between the local host and the link partner.

2.Perform a loopback test on your own system by using the ping command. If this is successful, your system is operating properly to the Network Layer (OSI Layer 3).

3.Verify the remote host is running, using the ping command. If the remote host does not respond, ask the host's system administrator to start the host. For additional information about the ping command, see “Testing Access to Internet Network Hosts” (page 89).

4.Verify that an entry exists for the remote host in your system's ARP cache by entering the following command:

If the entry is wrong or incomplete, enter the correct station address by using the arp command. See arp(1M) for more information.

5.Make sure the network devices are configured properly on the local host, using the netstat -icommand.

6.Verify that the routing tables on the local host are correct, using the netstat -rcommand. Use the ping command to determine whether the IP router is reachable.

72 Troubleshooting HP APA