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Fri, Oct 06, 2017 11:15 pm

Viewing DHCP information on an OS X system

If you want to determine the IP address of the DHCP server from which a Mac OS X system received its IP address, subnet mask, etc., you can obtain that information from a command-line interface (CLI), i.e., a Terminal window by using the command ipconfig getpacket interface where interface is the relevant network interface, which will usually be en0 or en1. You can issue the command ifconfig -a in a Terminal window to see the network interfaces on the system and which have IP addresses assigned to them.

getpacket interface-name
Prints to standard output the DHCP/BOOTP packet that the client accepted from the DHCP/BOOTP server. This command is useful to check what the server provided, and whether the values are sensible. This command outputs nothing if DHCP/BOOTP is not active on the interface, or the attempt to acquire an IP address was unsuccessful.

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