NOTE:
If you are using the HOT_STANDBY load distribution
algorithm, be sure the switch side port is not in any trunk.
Network
reachable?
NO
YES
If a remote host's network is not reachable, the following message is
displayed in response to the
ping
command:
network is unreachable
Complete the following steps:
1.
Ensure that the network devices are configured properly on the
local host, using the
netstat -i
command.
2.
Verify that the routing tables on the local host are correct, using
the
netstat -r
command.
Host known?
NO
YES
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.
Host reachable?
NO
YES
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.
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).
2.
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 80)
.
4.
Verify that an entry exists for the remote host in your system's
ARP cache by entering the following command:
62
Troubleshooting HP APA
