Format: <address>/<length>,gateway,valid,metric
* 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