18.5 Monitoring the network

18.5.1 arp

The address resolution protocol program, arp, is useful for determining other machines broadcasting on your subnet. The -a option will display the current ARP entries from the kernel, e.g.:

% arp -a

Net to Media Table

Device IP Address Mask Flags Phys Addr

------ -------------------- --------------- ----- ---------------

le0 gallifrey.acs.ohio-state.edu 255.255.255.255 08:00:20:0c:63:66

le0 tardis.acs.ohio-state.edu 255.255.255.255 08:00:20:06:85:c9

le0 ace.acs.ohio-state.edu 255.255.255.255 08:00:20:0c:3f:ec

le0 nyssa.acs.ohio-state.edu 255.255.255.255 SP 08:00:20:0c:a2:93

le0 224.0.0.0 240.0.0.0 SM 01:00:5e:00:00:00

Unix System Administration - 8 AUG 1996

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