IP Spoofing - the term for forgery of source IP address in the packet sent by a computer network. Such action may serve to hide the identity of the attacker (eg DoS attacks), undergrowth under another user on the network and interfering with its network activity or use of the powers held by a different address (attack used by the Kevin Mitnick in order to get to Tsutomu Shimomura's computer.)
now these attacks are somewhat thwarted by the filtering introduced by some ISPs, as well as the use of cryptographic security of communication and difficult to guess the initial sequence numbers the TCP / IP. DoS attacks on the TCP / IP service can be further reduced mechanism of SYN cookies.
Spoofing-Articles
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