From: Andreas Junestam (andreas@atstake.com)
Date: Tue Jun 04 2002 - 03:57:29 EDT
Hi,
there is one more way to do this, but it assumes the machine to listen
on atleast one well-known port. Do a SYN sweep (fscan is easy to use
for this if you're stuck under windows) of the entire class B, but only
scan for 10-20 well-know ports and without pinging, such as ftp, ssh,
telnet, dns, http, finger, fw-1 ports, netbios, rpcportmap, https,
ldap, cisco ports and so on. This will not take more than 10-20 sec
per host. When you have pinned down most machines with this (and maybe
combined with an ordinary ping sweep), just hit all found machines with
a full blown nmap scan.
/andreas
wirepair wrote:
>
> Thanks for the responses:
> - The -PT option is great, if you know the host is
> listening on that specific port, otherwise it's kinda of
> useless. Remember a firewall is most likely sitting
> infront intercepting these packets, if the IP does not
> exist the firewalls going to drop (and not send a rst) the
> packet. This gives us no information to work from heh.
> - The -T Insane (5) -T Aggressive (4) Options don't
> exactly help either, Insane gives up after 75 seconds if
> no response is seen, (keep in mind a machine that may have
> a service listening on port 23592, this would never get
> picked up, nmap would quit after 75 seconds of scanning
> [unless it hit this by random]) So that rules this option
> out. Aggressive timed out in 300 seconds same deal as
> before with Insane.
> - strobe didn't seem to work any faster in this case, I
> tried that as well.
> *sigh* people need to not disable icmp echo reply :)
> Any other suggestions? (Thanks to all of you who did
> respond)
> -wire
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