>>> tdecode(Ether()/IPv6()/ICMPv6ND_RA()/ICMPv6NDOptSrcLLAddr()/ICMPv6NDOptUnknown(data='watwatwat')/ICMPv6NDOptCaptivePortal())
...
ICMPv6 Option (Source link-layer address : 00:00:00:00:00:00)
Type: Source link-layer address (1)
Length: 1 (8 bytes)
Link-layer address: 00:00:00_00:00:00 (00:00:00:00:00:00)
ICMPv6 Option (Unknown 0)
Type: Unknown (0)
Length: 2 (16 bytes)