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Today, when the power went of in the office, I got a new IP for my machine (I had and got when the power came back.)

That caused a problem because all the machines in the office are using my IP address to connect to the version control system installed on my Mac!

Please advise on how can I make the IP always the same. I'm using a D-link router.


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up vote 3 down vote accepted

You have two options:

  • Assign an IP address in System Preferences, Network manually by selecting Manually for Configure IPv4
  • Assuming the router is your DHCP server, open its web interface and search for the DHCP configuration. It might have an option to assign a permanent IP address for a specific machine or MAC address. Consult the router's manual for details.

The first option might lead to conflicts. It is generally a good idea to separate the range of addresses you assign manually from the range used by the DHCP server (e.g. x.x.x.1-x.x.x.100 manually, x.x.x.101-x.x.x.250 reserved for DHCP). In that case, you would need to reconfigure your other machines, something which could have been prevented with a bit of planning -- but you only need to do it once.

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...very much favouring the 2nd option over the first! (Just to avoid problems when some other computer is started before the Mac is, though a SVN server probably running 24/7?) A 3rd option: assign it a DNS name in the router's DHCP settings, so folks can use the name rather than some IP address. – Arjan Dec 9 '10 at 9:02
@Arjan That's why I added the last paragraph. Don't know why it doesn't show up as being edited though. – Daniel Beck Dec 9 '10 at 9:23
you must have been typing that while I commented; your answer was not 5 minutes old yet, and edits within 5 minutes after the last edit do not count as separate edits (the so-called "grace period". Useful, but also abused a lot for the Fasted Gun in the West Problem...) – Arjan Dec 9 '10 at 9:29
@Arjan Thanks for the info on the grace period, although I don't think the osx tag and related tags are currently prone to this issue. Congrats on the 10k rep! – Daniel Beck Dec 9 '10 at 11:52

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