Thursday, June 6, 2019

DNS across VLANs in IPv6?

I made a post on superuser but noone replied, so ill try it here aswell.

I have a small experimental IPv6 network, which looks like this:

https://imgur.com/a/p6zOrNw

With 2 clients connected to a L2 Switch, and the L2 Switch and a AD/DNS Server connected to a L3 Switch.

Now, i had the server connected to the L2 Switch before, and with SLAAC + stateless DHCPv6, the DNS requests were all going fine and everything was working. Now i moved the server to its own L3 port and put both ports into different VLANs. Heres the problem: While the Clients and the Server can still ping each other, and IP autoconfig still works on the clients (the server has a static IP), DNS does not work anymore. I already changed the DNS Servers IP on the L3 switches config, but nothing i tried and looked up solved the issue. The server is on windows server 2012 R2, the clients on windows 10 Pro, the L2 switch is a Netgear GS105E and the L3 switch a Cisco Catalyst 3560. Sorry for bad english, hope someone has an idea!



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