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Full Discussion: What arp -s is good for
The Lounge War Stories What arp -s is good for Post 302720761 by DGPickett on Wednesday 24th of October 2012 03:18:33 PM
Old 10-24-2012
Swapped, well received, right.

I believe ARP entries are good for about 5 minutes (which fouls up IP failover strategies on very high uptime systems), so the list does not usualy get very long. I suppose a NIC with a promiscuous arp algorythm could collect ARP from packets not for you, if you are not segregated by a switch from all such traffic. Network is a very competitive arena.
 

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ARPSPOOF(8)						      System Manager's Manual						       ARPSPOOF(8)

NAME
arpspoof - intercept packets on a switched LAN SYNOPSIS
arpspoof [-i interface] [-c own|host|both] [-t target] [-r] host DESCRIPTION
arpspoof redirects packets from a target host (or all hosts) on the LAN intended for another host on the LAN by forging ARP replies. This is an extremely effective way of sniffing traffic on a switch. Kernel IP forwarding (or a userland program which accomplishes the same, e.g. fragrouter(8)) must be turned on ahead of time. OPTIONS
-i interface Specify the interface to use. -c own|host|both Specify which hardware address t use when restoring the arp configuration; while cleaning up, packets can be send with the own address as well as with the address of the host. Sending packets with a fake hw address can disrupt connectivity with certain switch/ap/bridge configurations, however it works more reliably than using the own address, which is the default way arpspoof cleans up afterwards. -t target Specify a particular host to ARP poison (if not specified, all hosts on the LAN). Repeat to specify multiple hosts. -r Poison both hosts (host and target) to capture traffic in both directions. (only valid in conjuntion with -t) host Specify the host you wish to intercept packets for (usually the local gateway). SEE ALSO
dsniff(8), fragrouter(8) AUTHOR
Dug Song <dugsong@monkey.org> ARPSPOOF(8)
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