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Old 3rd July 2008
dk_netsvil dk_netsvil is offline
Real Name: Devon
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Join Date: May 2008
Location: New York
Posts: 75
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It sounds like what you'd like to do is use tcpdump to discover the hostnames of machines within a particular subnet. If you use the -n flag it's going to display IPs and not perform the lookup to resolve the hostname and display that if the hostname exists in local DNS. Because you're using a private subnet you'd have to have some internal DNS server that mapped those private IPs to hostnames, otherwise it doesn't matter what those machines call themselves - the hostname of a machine isn't communicated within the packet, just the src and destination IPs.

A tool you could use, if you were interested in mapping a subnet, is nmap. Or, if you're motivated, a tool like OpenNMS.
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