i) DS-Lite AFTR-Name Option
j) Prefix Class (experimental)
k) CER-ID (experimental)
+ l) Softwire address and port mapped clients (experimental)
4. Support for requesting and parsing Router Advertisements
a) parsing of prefixes, routes, MTU and RDNSS options
* RA_DNS A space-separated list of recursive DNS servers from the RA
* AFTR The DS-Lite AFTR domain name
* AFTR_IP The DS-Lite AFTR resolved IPv6 address
+* MAPE / MAPT / LW4O6 Softwire rules for MAPE, MAPT and LW4O6