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Command Sets for Command Line Interface
1. arp
Syntax:
arp add <i/f> <IP address> <MAC address>
arp delete <i/f> <IP address>
arp flush
arp [list]
arp help [all|<cmd>]
Description:
Allows display and manipulation of the ARP table: the list of IP
addresses and corresponding MAC addresses obtained by ARP on
Ethernet-like interfaces. Normally there is no need to add entries to
the table with “arp add”, since they should be discovered by the
ARP protocol. Displaying the table with “arp list” (or just “arp”)
is sometimes useful, and deleting an entry with “arp delete”, or the
whole table with “arp flush”, can sometimes speed up recovery
from temporary problems if something unusual has happened.
Entries added with “arp add” do not time out like those discovered
by use of the ARP protocol, but they are deleted by “arp flush” and
will not survive a restart (they are not saved by configuration saving).
Note that the ARP table is used only for destinations on directly
connected Ethernet-like networks, not for those reached through
routers (although the ARP table may be used to discover the MAC
address of the router).
Example:
DSL> ip arp add ether 192.168.50.1 8:0:20:19:9A:D9
DSL> ip arp
arp add flane 192.168.2.63 00:20:2b:e0:03:87 # 8m58s
arp add flane 192.168.2.109 00:20:2b:03:08:b1 # 2m24s
arp add ether 192.168.50.1 08:00:20:19:9a:d9 # forever
arp add ether 192.168.50.57 00:20:af:2e:fa:3c # 3m25s
DSL> ip arp delete flane 192.168.2.109
DSL> ip arp list
arp add flane 192.168.2.63 00:20:2b:e0:03:87 # 8m46s
arp add ether 192.168.50.1 08:00:20:19:9a:d9 # forever
arp add ether 192.168.50.57 00:20:af:2e:fa:3c # 3m13s
DSL> ip arp flush
DSL> ip arp
# flane ARP table is empty
# ether ARP table is empty
DSL> ip arp
arp add flane 192.168.2.108 00:20:2b:03:0a:72 # 10m58s
# ether ARP table is empty
(The last example shows that the MAC address for 192.168.2.108 has