Noticed yesterday that my IPv6 is not working correctly.  When set to Dynamic and connected to my Xfinity router, all appears fine except that IPv6 sites will not load.  When I run a IPv6 test, it replies that I do not have an IPv6 ip adress.  I changed the setting to PassThrough(Bridge) and all works fine.  I know that this is not the way that it is supposed to be setup, but cannot find a way around. Any help to resolve the issue would be great.