> I suspect that in these cases the RSTs may be coming from firewalls
> rather than end-hosts. It would be more impressive and surprising if
> one ever got a SYN-ACK in response.
Not really. A variant of the same test addressed to common ports such as
139 resulted in four SYN+ACKs coming back, compared to 50 SYN+ACKs when
the checksum was correct - which is roughly similar to the previous
figure. Quite surprisingly, some of this comes from what seems to be
Windows XP SP1 - but maybe an intermediate device rewrites the packet
instead.
--
------------------------- bash$ :(){ :|:&};: --
Michal Zalewski * [http://lcamtuf.coredump.cx]
Did you know that clones never use mirrors?
--------------------------- 2003-12-12 18:18 --
http://lcamtuf.coredump.cx/photo/current/
