Re: Discovering Live Hosts

Note: forwarded message attached.



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--- Begin Message --- --- rajat swarup <rajats@xxxxxxxxx> wrote:

On 8/8/07, Nikhil Wagholikar <visitnikhil@xxxxxxxxx>
wrote:

Thanks for your suggestion. However as I said
earlier that "if suppose SMTP is
configured on port 26 instead of traditional port
25, then it would
add a twist to this situation". Hence your
suggested method would
still leave some hosts down. Can you kindly
further granularize your
suggestion?




But it would turn up with port 25 as "closed" which
still shows that
the host is alive.


Or not! The fw can be configured not to respond in
case that a port is closed. In this situation nmap
reports the port as "filtered" and you can't tell if
the host is up. In fact, a live host with no ports
open and with a fw configured to reject icmp can
appear as offline.





--
Rajat Swarup

http://rajatswarup.blogspot.com/


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