session-hijacking is still available?

["SB CH" <chulmin2 () hotmail com>]

Hello, all.

if attacker can do session hijacking, he can know the seq number change, 
ack seq number change something like that.
But I have heard that modern system like linux kernel 2.4.x or openbsd 
produce almost random seq number, so session hijacking is almost impossible 
thesedays.

is it true or not?
anyone still can session hijacking using session hijacking program like 
hunt?

Thanks in advance.




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