spoofing

A technique used to reduce network overhead, especially in

wide area networks (WAN).

Some network protocols send frequent packets for management

purposes. These can be routing updates or keep-alive

messages. In a WAN this can introduce significant overhead,

due to the typically smaller bandwidth of WAN connections.

Spoofing reduces the required bandwidth by having devices,

such as bridges or routers, answer for the remote devices.

This fools (spoofs) the LAN device into thinking the remote

LAN is still connected, even though it's not. The spoofing

saves the WAN bandwidth, because no packet is ever sent out on

the WAN.

LAN protocols today do not yet accommodate spoofing easily.

["Network Spoofing" by Jeffrey Fritz, BYTE, December 1994,

pages 221 - 224].

(1995-01-13)