root@OpenWrt:~# rdisc6 pppoe-wan
Soliciting ff02::2 (ff02::2) on pppoe-wan...

Hop limit                 :           64 (      0x40)
Stateful address conf.    :           No
Stateful other conf.      :          Yes
Mobile home agent         :           No
Router preference         :       medium
Neighbor discovery proxy  :           No
Router lifetime           :         1800 (0x00000708) seconds
Reachable time            :        60000 (0x0000ea60) milliseconds
Retransmit time           :        30000 (0x00007530) milliseconds
 Source link-layer address: 00:30:88:xx:xx:xx
 MTU                      :         1492 bytes (valid)
 Prefix                   : 2003:40:xxxx:xxxx::/64
  On-link                 :          Yes
  Autonomous address conf.:          Yes
  Valid time              :        14400 (0x00003840) seconds
  Pref. time              :         1800 (0x00000708) seconds
 from fe80::230:xxxx:xxxx:xxxx