hgn

@virgo:~ $ sudo tcpdump -vvvv -ttt -i eth1 icmp6 and 'ip6[40] = 134'
00:00:00.000000 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 200) fe80::b675:eff:fefa:1cb > ip6-allnodes: [icmp6 sum ok] ICMP6, router advertisement, length 200
	hop limit 0, Flags [managed, other stateful], pref medium, router lifetime 1800s, reachable time 0s, retrans time 0s
	  source link-address option (1), length 8 (1): b4:75:0e:fa:01:cb
	    0x0000:  b475 0efa 01cb
	  mtu option (5), length 8 (1):  1280
	    0x0000:  0000 0000 0500
	  prefix info option (3), length 32 (4): 2a01:ffff:43f::/64, Flags [onlink, auto], valid time 7200s, pref. time 1800s
	    0x0000:  40c0 0000 1c20 0000 0708 0000 0000 2a01
	    0x0010:  ffff 043f 0000 0000 0000 0000 0000