H-3. arpThe ARP table maps MAC addresses to IP addresses. In other words, it maps layer two to layer three. Only directly connected devicesi.e., on the local networkappear 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 dynamic Here 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. |