DHCP
When connecting a computer to most enterprise networks, if the Dynamic Host Configuration Protocol (DHCP) is enabled, it will assign an IP address to that computer, and send a lot of information. Nameservers and domain names are usually set through DHCP offer packets.
On UNIX-like systems, the /etc/resolv.conf
file will store information for name resolution operations after the DHCP offer.
The nmap tool can be used with its broadcast-dhcp-discover.nse script to easily parse those packets.
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