September 2005
Beginner
462 pages
12h 56m
English
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arp
The ARP table maps MAC addresses to IP addresses. In other words, it maps layer two to layer three. Only directly connected devices—i.e., on the local network—appear in this table. The arp command found on Windows and Unix systems allows for the addition and deletion of entries. Here is output from the Windows command:
C:\> arp -a
Interface: 192.168.1.120 --- 0x10004
Internet Address Physical Address Type
192.168.1.3 00-09-5b-51-38-26 dynamicHere is output from a Unix system:
$ /usr/sbin/arp -a
kahlua.reflex 192.168.0.6) at 00:30:48:20:92:47 [ether] on eth0
barton.reflex (192.168.0.3) at 00:B0:D0:3D:D4:9A [ether] on eth0
myic (192.168.0.147) at 00:0F:1F:04:71:79 [ether] on eth0
jameson.reflex (192.168.0.1) at 00:60:F5:08:4E:3C [ether] on eth0
$Note that on Unix systems, the format of the output from arp can differ.
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