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IPv6 changing to Automatically in OS X. Why?

I have a Golden Triangle setup using 2008 AD server and OS X 10.5.8 servers. All clients are 10.5.8. All clients have been imaged the same. On the clients IPv6 is turned off in the network system preferences but recently a few (7-8 out of 400) have changed IPv6 to "Automatically" under "Configure IPv6" in the advanced tab of the preferences. I have had the same setup on all clients for 2 years without this issue coming up. Does anyone know what could suddenly cause this change. When it happens, network users cannot log into the clients (shakes) and I have to turn off IPv6, then unbind from and re-bind to AD.
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EdTechy
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EdTechy
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roylongCommented:
Have you changed any network equipment that's common to the client machines which are changing?  This possibly could be a network device or computer pushing out IPv6 information during start up of the clients.

Can you network scan for IPv6 traffic and see if you have any rogue devices talking over this protocol?
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EdTechyAuthor Commented:
I attached an Airport Extreme base station a few weeks ago to configure it. It is no longer on the network though. However, I think this issue first appeared before that. Also, the computers get shut down every night and I had two have this issue this morning. No others have had a problem today and nothing has changed in the last 2 weeks on the network. I will analyze the network traffic and see if that leads to any clues.
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EdTechyAuthor Commented:
I find very little ipv6 traffic on the network. Most are queries. Only about 2400 packets in 20 minutes. I don't see anything unusual.
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roylongCommented:
make a note of all the devices querying and advertising on IPv6 and systematically turn them off (if you have nothing using the IPv6 protocol).

once all IPv6 is gone, see if your devices are still changing this setting.

just a thought, do you utilise any group policies from AD through the OD server?  Did any of these get updated?

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EdTechyAuthor Commented:
I can try your first suggestion, however, since this has only happened a few times it will be hard to determine if any thing is solved or it is just a time period where it would not have happened anyway.

I have made two changes regarding policies/preferences. I added a GPO applied to one small group of students.
Also, I noticed (while thinking about your question) that all of these issues have surfaced on the library computers. The first two problems were on computers that have very strict computer group preferences applied,the last two problems were on computers that should not have the preferences applied. However, the day the last two computers had this issue, I noticed they were actually a part of the computer group with the prefs applied. I am not sure how they got added to the group but they were there. I haven't made any changes to the group recently and the prefs applied would have been noticeable if they had been in that group for a while. So yes, there have been changes but I don't notice anything in the GPO or the WGM prefs that would cause this.
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EdTechyAuthor Commented:
I believe I had an Airport installed on the network set to give the IP addresses. I am not sure why it changed the clients ipv6 on but I have not had a problem since reconfiguring the airport. Thanks for the direction.
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