K 10
svn:author
V 5
dougb
K 8
svn:date
V 27
2010-05-16T00:43:49.818821Z
K 7
svn:log
V 537
Add support for ipv6_prefer=AUTO. If there is no external IPv6 interface
configured then IPv4 will always be preferred. If there is, then v6 will
be preferred. The yes/no options will continue to work as before.

While I'm here, in ifconfig_up():
 1. Only create the v6-related local variables if we're going to use them
 2. In the case of ipv6_autoconfif but no (other) ifconfig line we need
    to set _cfg=0. Currently this is a no-op, but if there were no IPv4
    configuration for the same interface it wouldn't come up otherwise.

END