IPv4 Clients Getting a IPv6 DNS Server
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Well, I managed to get this resolved. Turns out I was on the right track it IPv6 tunneling. I put 2 rules in:
Block IPv4 proto UDP port 3544
Block IPv4 proto IPv6 port anyRebooted my clients and they are no longer getting an IPv6 added to their DNS servers list.
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It's configured manually on the client? It was cached from some earlier time?
I don't see how it could possibly be via DHCPv6 given that it doesn't have an IPv6 address.
Steve
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Yeah, I was thinking all the things you're saying. All clients have had these IPv6 DNS addresses for months. Really hasn't caused any issues other than annoying me because I didn't know where clients were getting it from. I think Windows has some automatic thing where it establishes IPv6 Teredo connection. Found some KB articles online that show how to disable it in the registry. Adding rules to bock it on pfSense made the addresses disappear soon as I did a lease renew on the clients which is cool so now I don't have to push out registry changes.
I'll leave this post here so it might help someone else.
