Add /usr/local/sbin/ppp-ipv6 helper script
Add /usr/local/sbin/ppp-ipv6 helper script

/usr/local/sbin/ppp-ipv6 <real interface> up|down

Interface using SLAAC or DHCP6 going down:

* bring down dhcp6c if it is running
* disable router advertisements (and therefore SLAAC)
* remove any autoconfigured IPv6 addresses

Interface using SLAAC or DHCP6 coming up:

* call interface_dhcpv6_configure() if dhcp6c not running and router advertisements off

interface_dhcpv6_configure() will enable router advertisements,
configure rtsold and dhcp6c, then set rtsold to prime dhcp6c as
required.

BlackstarGroup/pfsense,NOYB/pfsense,dennypage/pfsense,ch1c4um/pfsense,brunostein/pfsense,pfsense/pfsense,ch1c4um/pfsense,jxmx/pfsense,NewEraCracker/pfsense,dennypage/pfsense,NOYB/pfsense,NOYB/pfsense,NewEraCracker/pfsense,pfsense/pfsense,brunostein/pfsense,dennypage/pfsense,phil-davis/pfsense,NewEraCracker/pfsense,pfsense/pfsense,pfsense/pfsense,jxmx/pfsense,brunostein/pfsense,phil-davis/pfsense,NewEraCracker/pfsense,ptorsten/pfsense,ptorsten/pfsense,ptorsten/pfsense,BlackstarGroup/pfsense,phil-davis/pfsense,BlackstarGroup/pfsense,phil-davis/pfsense,dennypage/pfsense,jxmx/pfsense,BlackstarGroup/pfsense,ch1c4um/pfsense,ch1c4um/pfsense