Quote: Originally Posted by zigzag3143
..workgroup uses ipv4. If you were to change from homegroup to workgroup it would have no choice but to use the same IPv4.
Workgroup does not force IPv4! Nor is the problem Homegroup or Workgroup, the problem is one machine is referencing the other using a different IP scheme. This can be due to several reasons. First-in-first-out comes to mind. When doing a lookup on the machine name it looks for the first entry that it finds, could be an IPv4 or IPv6 address. To avoid this wildcard lookup, you can either force one address scheme over another. (Normally offered in software...ping for example offers -4 and -6 switches)
You can try this option, in the Advance settings for either IPv4 or IPv6, go to the DNS tab and toggle "Register this connection's addresses in DNS" on or off.
A Workgroup setup works independent of the IP address scheme, why else do you think Windows Vista can use Workgroups in an IPv6 environment?