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Again, this only works if other hosts reply to ICMP.  "-sP" is nmap
parameter for "ping scan".   If you want to locate possible hosts that
ignore/drop ICMP, then do this: 

   nmap -P0 -sU 192.168.2.1-254   

The above takes longer, but is more thorough.   -P0 means to don't try
pinging, -sU is for UDP scans (instead of TCP).  IMHO you will find more
hidden hosts with UDP than with TCP scans.  YMMV.

Also try adding -v (verbose) and -T5 (no holds barred).

hth,

-Jim P.



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