[maybe OFFTOPIC]: connections from 1.0.0.0 !?!

Vedad Kajtaz (vk@mankind.net)
Tue, 16 Mar 1999 13:41:34 +0100


Hi,

i'm running several tcp/ip servers on two 2.0.36 boxes, and found the
following in this
morning logs (on each server and makes me think its a hack attempt):

- Accepting client from 1.0.0.0

This means a connection has been successfully accept()'ed, from 1.0.0.0
(server does an sprintf of
inet_ntoa on accepted ip) which is as far as i know an invalid internet
address.
Servers are up and running correctly since few months and i dont beleive
this is a bug.

How is it possible for someone to *establish* a connection with a fake
adress? i know packets can be
sent pretending to be someone else, but i thought that all tcp sequence
stuf would make this impossible
(note i had more then ten such logs, thus more then ten successfull
connects, on three different server
process')

Any comments would be highly appreciated,

Thanx,

-- Vedad Kajtaz

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