On 02/11/2017 02:10 PM, Nils Freydank wrote: > Hi Thelma and others, > > On Fri Feb 10 2017, 18:34:34 CET wrote the...@sys-concept.com: >> When I scan my local network: >> nmap -sn 10.10.0.0/24 >> >> It prints all the devices connected to it but sometimes it prints the >> device "name" and sometimes it doesn't eg: >> >> Nmap scan report for iaxy (10.0.0.108) >> Host is up (-0.095s latency). >> MAC Address: 00:0F:D3:00:30:DD (Digium) >> >> Nmap scan report for 10.10.0.3 >> Host is up (0.00017s latency). >> MAC Address: 54:7F:54:76:61:0D (Ingenico) >> >> "...for "name" + IP" >> "...for + IP >> >> Where is it taking the "name" from? >> It would like to assign a label "name" to all devices. >> -- >> Thelma > > I’d say that the name "iaxy" is a via DNS (reverse) resolved hostname; maybe > there is a DNS server running (or there are entries in /etc/hosts) or it’s > just > zeroconf/bonjour[1], which runs nowadays virtually everywhere. > > The other part looks to me as vendors names nmap got from the MAC addresses > which first parts are vendor specific. > > A quick search[2] gave me these two results (beside some other ones) who seem > to confirm my thoughts: > > http://superuser.com/questions/702309/how-to-get-device-name-from-scan-like-nmap-on-linux > http://stackoverflow.com/questions/27817412/why-nmap-sometimes-does-not-show-device-name > > [1] https://en.wikipedia.org/wiki/Zero-configuration_networking > [2] https://duckduckgo.com/?q=nmap+device+names&t=ffab&ia=qa > > Hope that helps you :) > > PS: What exactly does '-sn' (or is it just a typo)? My nmap doesn't complain > when I use it, but the manpage only knows about '-sN' here > (net-analyzer/nmap-7.40).
-sn: Ping Scan - disable port scan The only difference between the two networks that I'm aware of is one runs dd-wrt on Linksys router and the other (with names showing) runs on Asus NT-R16 router. Non of them run DNS server to my knowledge. -- Thelma
