Notes on Networking #

IPv6 #

root@vault ~ # tcpdump -i tap100i0 '(udp port 546 or 547) or (icmp6 and (ip6[40] == 133 or ip6[40] == 134))' -n -vv
tcpdump: listening on tap100i0, link-type EN10MB (Ethernet), snapshot length 262144 bytes
20:44:53.569782 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 64) fe80::ca4c:75ff:fe77:a3d9 > ff02::1: [icmp6 sum ok] ICMP6, router advertisement, length 64
        hop limit 64, Flags [managed], pref medium, router lifetime 1800s, reachable time 0ms, retrans timer 0ms
          source link-address option (1), length 8 (1): c8:4c:75:77:a3:d9
            0x0000:  c84c 7577 a3d9
          mtu option (5), length 8 (1):  1500
            0x0000:  0000 0000 05dc
          prefix info option (3), length 32 (4): fd00:0:1400::/64, Flags [onlink, auto], valid time 2592000s, pref. time 604800s
            0x0000:  40c0 0027 8d00 0009 3a80 0000 0000 fd00
            0x0010:  0000 1400 0000 0000 0000 0000 0000