I have a windows 2008R2 network.
Comcast came in and replaced the SMC modem I had with with a Cisco DPC3941B. Now I have an issue where I can not join machines to AD. My network does DCHP and DNS services for domain. I have enclosed the Ipconfig /all.
When you look at the DNS ipconfig /all there are IPV6 address. I looked them up they are Comcast addresses and they are before my 192.168.1.11 DNS server. I am not giving out any IPV6 and I believe these address will be looked at first. I looked up these addresses and they are comcast DNS. When I try to join machines to AD I get a DNS error I am attributing to these IPV 6 entries. I am not using IPV6 in the network and IPV6 DNS enters are not checked in AD.
I really could use a second pair of eyes on this. Comcast indicates this modem is not doing IPV6 and it is shut off. I asked them to. I have no firewall. It is just the modem in bridge mode supposedly doing just NAT translation. I think this thing is doing more that what it is supposed to and it is in bridge mode. I went into the interface and checked.
Thanks very much for the help