From Fedora Project Wiki
Disabling IPv6 for specific connection
Q: Does this feature include the use case when I need to have ipv6 disabled for a specific connection, which includes not having any inet6 addresses in the interface (as seen by ifconfig), which I have even when using current (fedora 11) nm (unless removing the ipv6 module from kernel or disabling ipv6 other way)? -- user:Mso
Please don't require dhcpv6
I use radvd on my networks instead of dhcpv6. Don't hardcode NM to require dhcpv6.