New Comcast Router IPv6 DHCP Screwing up SBS2011 and Exchange
Posted on 2014-11-10
I had to have a modem/router from comcast that was giving us issues so they came by on Friday and replaced it with a new Cisco DPC3939B gateway/router.
The problem is that this gateway has IPv6 DHCP built in that it automatically assigns to all my local clients and there is no way to disable it. Comcast told me this is not their problem, even though this is their equipment and we are forced to lease it at $13/month (something that I can't avoid as we have a phone system from them) and even if we buy our own equipment we will still be forced to pay the fee. So I'm trying to get this fixed before I spend money on equipment I don't really need.
The router has a IPv4 DHCP server which I can disable and a IPv6 DHCP server that it will not let me disable. It does however give me 3 options, "Stateless (auto-config)" which I can't turn off, "Stateful (Use DHCP Server) which I can turn off and have turned off, and the ability to assigned DNS manually.
I am hoping that if I can assign the DNS manually I can get this to work.
First off, how do I find out what the IPv6 address is of my server/domain controller hosting exchange 2010? It is SBS2011. I also have a Windows 2003 backup domain controller that I hope to soon eliminate but for now am stuck with. Do I need to have IPv6 on there?
Second, I noticed that in Server 2008 the IPv6 address is obtained automatically and that it also has it's own DHCP server for IPv6. Does it get the IPv6 address from it's own DHCP server or from the comcast router? Should I reset it to be a static IP? If so how do I determine what IP I should use?
I am still new to IPv6 so sorry if these are dumb questions.