Solved

IPv6 changing to Automatically in OS X. Why?

Posted on 2011-02-24
6
626 Views
Last Modified: 2012-06-27
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.
0
Comment
Question by:EdTechy
  • 4
  • 2
6 Comments
 
LVL 15

Expert Comment

by:roylong
ID: 34970691
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?
0
 
LVL 10

Author Comment

by:EdTechy
ID: 34971341
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.
0
 
LVL 10

Author Comment

by:EdTechy
ID: 34972645
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.
0
How to improve team productivity

Quip adds documents, spreadsheets, and tasklists to your Slack experience
- Elevate ideas to Quip docs
- Share Quip docs in Slack
- Get notified of changes to your docs
- Available on iOS/Android/Desktop/Web
- Online/Offline

 
LVL 15

Accepted Solution

by:
roylong earned 500 total points
ID: 34975558
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?

0
 
LVL 10

Author Comment

by:EdTechy
ID: 34979905
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.
0
 
LVL 10

Author Closing Comment

by:EdTechy
ID: 35215991
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.
0

Featured Post

How to run any project with ease

Manage projects of all sizes how you want. Great for personal to-do lists, project milestones, team priorities and launch plans.
- Combine task lists, docs, spreadsheets, and chat in one
- View and edit from mobile/offline
- Cut down on emails

Join & Write a Comment

In this article we will discuss some EI Capitan Mail app issues and provide some manual process to resolve them.
Let’s list some of the technologies that enable smooth teleworking. 
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…

759 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

18 Experts available now in Live!

Get 1:1 Help Now