-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 YashPal Singh,
A way to determine if systems are alive is to do a ping sweep across a range of IP addresses you determine. There are various tools you can use, such as nmap and fping for UNIX, and SuperScan and ipEye for Windows. There are other tools out there, but these seem to be the most used. These tools will be able to tell you with certainty which systems are alive and which aren't. Hacking Exposed, 3rd Ed., has excellent information on searching all alive machines on network, as well as other security topics. Chapter 2 has a section that talks about determining if systems are alive, using ping sweeps, ICMP queries, port scans, etc. Investing in this book is well worth it...I highly suggest it. Regards, Paul Soriano, CCNA, A+ (312) 371-2264 "Lead By Example!" -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 7.0.3 for non-commercial use <http://www.pgp.com> iQA/AwUBPfEqTl9UWzzCd2rZEQI5OQCeIS5zLuSWx4GhMI/W73UGhm/olYwAoM5z jED48mBrnojZtw20S9Q8naBe =wyJp -----END PGP SIGNATURE-----
