json_init
json_add_string name "${interface}_6"
json_add_string ifname "@$interface"
+ [ "$pdptype" = "ipv4v6" ] && json_add_string iface_464xlat "0"
json_add_string proto "dhcpv6"
[ -n "$ip6table" ] && json_add_string ip6table "$ip6table"
proto_add_dynamic_defaults