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Wednesday, June 17, 2009

Finding the Address of your DHCP Server

Firewalls and routers are often configured as DHCP servers by default. That can cause issues if you already have a server on your internal network. How do tell which DHCP server any given client is using?

Mac OS X:
$ ipconfig getpacket en0
Where en0 is your Ethernet interface (you might want en1 if you are using a wireless connection)

ipconfig /all

$ more /var/lib/dhcp3/dhclient.eth0.leases
Where eth0 is your Ethernet interface.


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