3Com 3C421600A, Management Manual

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Troubleshooting Commands
169
Resolving Addresses The
arp
command performs IP address resolution. Use the following
command:
arp <ip address or host name>
The system will respond with an IP address (and MAC [Ethernet] address
if found on a locally connected network) of the host.
Example:
ARP: 172.122.120.118 -> 08:00:09:cc:58:bf
Resolving Host
Names
The
resolve name
command returns an IP address for a specified host
name by sending it to a DNS server for resolution. But before you can
resolve a host, you must have added a DNS local host and server entry for
resolution. To do so, use the
add dns host <name> address <ip
address>
and
add dns server <ip address>
commands.
You can resolve names locally or remotely as follows:
Locally —
add dns host hahvahd.college-hu.com address
133.114.121.15 resolve name hahvahd
Remotely —
add dns server 133.114.121.45 preference 1
name “Our DNS server”
Screen output example:
Network Name: hahvahd.college-hu.com is resolved to Address:
133.114.121.015
Using Ping The ping Command
The
ping
command is very helpful in testing RAS 1500 connectivity with
other network devices. Options let you set ping attempts (
count
), the
period between ping attempts (
interval
), the time before quitting
(
timeout
), a string value specifying data to be sent (
data
), the ping
packet dimension (
size
), the ping process off screen (
background
),
the progressive ping output for each ping request (
verbose
), and the
erasure of entries in the Remote Ping Table (
self_destroy_delay
).
The CLI can perform a ping with either
verbose
or
background
selected, but not both.
verbose
causes the CLI to display information
for each PING transmitted.
background
causes the CLI to start the PING
request and then ignores it.