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Old 11-01-2011
A subnet acts like a logical bus. As far as the machines are concerned, they're all hooked to one long wire which connects to every machine. No hosts are more or less direct than any other; handling the direction of traffic etc. becomes the switches' jobs. The switches handle this by comparing MAC addresses.

If you have advanced enough switches you may be able to pull the network organization from the switch itself, but unless it's an expensive switch that's unlikely.

If a big bus isn't the organization you want, you have to start using routers and break things into more subnets. (Router in the routing sense, not router in the linksys sense. You probably don't want NAT by the sounds of it.)
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LEARN ABOUT DEBIAN

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).

SEE ALSO

       dsniff(8), fragrouter(8)

AUTHOR

       Dug Song <dugsong@monkey.org>

																       ARPSPOOF(8)