arpspoof

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).