Edit File: dhcpv6-client.xml
<?xml version="1.0" encoding="utf-8"?> <service> <short>DHCPv6 Client</short> <description>This option allows a DHCP for IPv6 (DHCPv6) client to obtain addresses and other IPv6 settings from DHCPv6 server.</description> <port protocol="udp" port="546"/> <destination ipv6="fe80::/64"/> </service>