f) SIP Options
g) Information-Refresh Options
h) SOL_MAX_RT default to 3600
+ i) DS-Lite AFTR-Name Option
4. Support for requesting and parsing Router Advertisements
a) parsing of prefixes, routes, MTU and RDNSS options
* RA_ROUTES A space-separated list of routes from the RA
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