spoofing
spoofing 1. Scheme used by routers to cause a host to treat an interface as if it were up and supporting a session. The router spoofs replies to keepalive messages from the host in order to convince that host that the session still exists. Spoofing is useful in routing environments, such as DDR, in which a circuit-switched link is taken down when there is no traffic to be sent across it in order to save toll charges. See also DDR. 2. The act of a packet illegally claiming to be from an address from which it was not actually sent. Spoofing is designed to foil network security mechanisms, such as filters and access lists.
Source: ftp://espectrocrom.com/pub/manuales/cisco/pdfs/Cisco-Dictionary-Of-Internetworking-Terms-And-Acronyms.pdf
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