Perhaps that what I screwed up.I did as you said, and two sections came up:
Tunnel adapter 6to4,....... and with that one he default gateway was
The second section:
Tunnel Adapter Automic....
The default gateway was blank. In neither case was there anything like 192.168.0.1. But it seems to me that before I screwed it all up, there was a 192.168.1.1, and the second part of that was 255.255.255.0
I've made a mess of it all. Would dynamite help?