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5-20
Using the Hub
arp Command
The arp command allows you to display and change information in the Address
Resolution Protocol (ARP) table of the hub. The Address Resolution Protocol
maps known IP addresses (32 bits long) to MAC addresses (48 bits long).
By including a metric option, you can indicate the number of hops (number
of gateways separating the source and destination) to the designated
destination network. For example, to indicate five hops in the above
command line, type:
route add 128.87.45.12 128.87.45.33
To delete a route from the routing table, use the IP address in Internet dot
notation. For example, type:
route del 128.87.45.12 128.87.45.33
To determine the IP addresses of the destination and gateway, enter the
route dump command. For example, type:
route dump [Enter]
This display appears:
DESTINATION
GATEWAY
128.87.0.0
128.87.45.15
To display the contents of the ARP table, type:
arp dump
To delete the IP address of the host, type:
arp del xxx.xxx.xxx.xxx
where
is the IP address of the host in Internet dot notation.
xxx.xxx.xxx.xxx
To add an entry to the ARP table, type:
arp set xxx.xxx.xxx.xxx hh.hh.hh.hh.hh.hh
xxx.xxx.xxx.xxx
where
hh.hh.hh.hh.hh.hh
is the host 48-bit MAC address in noncanonical
format.
is the IP address of the host and
5
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