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I've the following configuration : 1 computeur connected a 1 network over Wifi and another network over ethernet. These 2 network are totally independant.

I'm using nmap (6.00) to check which computer are connected on my wifi network. When I'm connected on the 2 networks I see every computer but nmap is not returning any hostnames. But when I only connect to my wifi network (removing the ethernet) nmap is capable to give the hostnames. Do you have any ideas why ?

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up vote 0 down vote accepted

After a bit of research :

Nmap uses reverse DNS to get the hostnames (cf man pages)

My ethernet network is providing a DNS, so reverse DNS won't find any name for the IPs since the 2 networks are independant.

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