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If your AirPort magically doesn’t work anymore: check IPv6!

December 8th, 2009 Leave a comment Go to comments

Today I finally found out why my iMac can’t communicate with the AirPort Express. For whatever reason, I disabled it, but IPv6 has to be On for the network interface you use to configure the AirPort! Either Automatically or Manually.

My old iMac G5 and MacBook Air were both still using IPv6, so no problem there. This bugged me for a long time and worked around it using the other machines.

There, PJ Harvey sounding great through the loudspeakers streamed from my shiny iMac. Woohoo!

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  1. Philip Paeps
    December 8th, 2009 at 09:54 | #1
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    Why would you disable IPv6? ;-)

    Does the configuration tool try to get to the device over a link-local address or something? Or does it use the all-routers (or it's own?) multicast group?

    Interesting use of IPv6. I like!

  2. Geert JM Vanderkelen
    December 8th, 2009 at 10:00 | #2
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    @Philip:

    As to the reason why I disabled IPv6, I have no idea anymore :)

    IPv6 on AirPort Express is by default configured as 'link-local', but you can choose 'Node' and 'Tunnel' (Teredo and/or IPSec).

    I guess they use IPv6 just to 'make sure it works' and doesn't clash with the conventional IPv4 setups?

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