Re: kern/52439: ipv6 stops routing randomly

To: gnats-bugs%NetBSD.org@localhost
Subject: Re: kern/52439: ipv6 stops routing randomly
From: Hisashi T Fujinaka <htodd%twofifty.com@localhost>
Date: Tue, 3 Oct 2017 19:37:17 -0700 (PDT)
I did a tcpdump while waiting for a router and here's what I see;

[htodd@mara]~ 2508 % sudo tcpdump -i wm0 -vv ip6
tcpdump: listening on wm0, link-type EN10MB (Ethernet), capture size 262144 bytes
19:32:53.873928 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 16) fe80::a236:9fff:fe8f:10aa > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 16
          source link-address option (1), length 8 (1): a0:36:9f:8f:10:aa
            0x0000:  a036 9f8f 10aa
19:32:53.958450 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 56) fe80::201:c0ff:fe09:c062 > ff02::1: [icmp6 sum ok] ICMP6, router advertisement, length 56
        hop limit 64, Flags [none], pref medium, router lifetime 1800s, reachable time 0s, retrans time 0s
          source link-address option (1), length 8 (1): 00:01:c0:09:c0:62
            0x0000:  0001 c009 c062
          prefix info option (3), length 32 (4): 2603:3004:a:31e3::/64, Flags [onlink, auto], valid time 2592000s, pref. time 604800s
            0x0000:  40c0 0027 8d00 0009 3a80 0000 0000 2603
            0x0010:  3004 000a 31e3 0000 0000 0000 0000
19:32:54.189239 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 56) fe80::201:c0ff:fe09:c062 > ff02::1: [icmp6 sum ok] ICMP6, router advertisement, length 56
        hop limit 64, Flags [none], pref medium, router lifetime 1800s, reachable time 0s, retrans time 0s
          source link-address option (1), length 8 (1): 00:01:c0:09:c0:62
            0x0000:  0001 c009 c062
          prefix info option (3), length 32 (4): 2603:3004:a:31e3::/64, Flags [onlink, auto], valid time 2592000s, pref. time 604800s
            0x0000:  40c0 0027 8d00 0009 3a80 0000 0000 2603
            0x0010:  3004 000a 31e3 0000 0000 0000 0000
19:32:57.885378 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 16) fe80::a236:9fff:fe8f:10aa > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 16
          source link-address option (1), length 8 (1): a0:36:9f:8f:10:aa
            0x0000:  a036 9f8f 10aa
19:32:58.019401 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 56) fe80::201:c0ff:fe09:c062 > ff02::1: [icmp6 sum ok] ICMP6, router advertisement, length 56
        hop limit 64, Flags [none], pref medium, router lifetime 1800s, reachable time 0s, retrans time 0s
          source link-address option (1), length 8 (1): 00:01:c0:09:c0:62
            0x0000:  0001 c009 c062
          prefix info option (3), length 32 (4): 2603:3004:a:31e3::/64, Flags [onlink, auto], valid time 2592000s, pref. time 604800s
            0x0000:  40c0 0027 8d00 0009 3a80 0000 0000 2603
            0x0010:  3004 000a 31e3 0000 0000 0000 0000
19:32:58.109461 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 56) fe80::201:c0ff:fe09:c062 > ff02::1: [icmp6 sum ok] ICMP6, router advertisement, length 56
        hop limit 64, Flags [none], pref medium, router lifetime 1800s, reachable time 0s, retrans time 0s
          source link-address option (1), length 8 (1): 00:01:c0:09:c0:62
            0x0000:  0001 c009 c062
          prefix info option (3), length 32 (4): 2603:3004:a:31e3::/64, Flags [onlink, auto], valid time 2592000s, pref. time 604800s
            0x0000:  40c0 0027 8d00 0009 3a80 0000 0000 2603
            0x0010:  3004 000a 31e3 0000 0000 0000 0000
19:33:01.896849 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 16) fe80::a236:9fff:fe8f:10aa > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 16
          source link-address option (1), length 8 (1): a0:36:9f:8f:10:aa
            0x0000:  a036 9f8f 10aa
19:33:02.120012 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 56) fe80::201:c0ff:fe09:c062 > ff02::1: [icmp6 sum ok] ICMP6, router advertisement, length 56
        hop limit 64, Flags [none], pref medium, router lifetime 1800s, reachable time 0s, retrans time 0s
          source link-address option (1), length 8 (1): 00:01:c0:09:c0:62
            0x0000:  0001 c009 c062
          prefix info option (3), length 32 (4): 2603:3004:a:31e3::/64, Flags [onlink, auto], valid time 2592000s, pref. time 604800s
            0x0000:  40c0 0027 8d00 0009 3a80 0000 0000 2603
            0x0010:  3004 000a 31e3 0000 0000 0000 0000
19:33:02.400913 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 56) fe80::201:c0ff:fe09:c062 > ff02::1: [icmp6 sum ok] ICMP6, router advertisement, length 56
        hop limit 64, Flags [none], pref medium, router lifetime 1800s, reachable time 0s, retrans time 0s
          source link-address option (1), length 8 (1): 00:01:c0:09:c0:62
            0x0000:  0001 c009 c062
          prefix info option (3), length 32 (4): 2603:3004:a:31e3::/64, Flags [onlink, auto], valid time 2592000s, pref. time 604800s
            0x0000:  40c0 0027 8d00 0009 3a80 0000 0000 2603
            0x0010:  3004 000a 31e3 0000 0000 0000 0000
19:33:05.908361 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 16) fe80::a236:9fff:fe8f:10aa > ff02::2: [icmp6 sum ok] ICMP6, router solicitation, length 16
          source link-address option (1), length 8 (1): a0:36:9f:8f:10:aa
            0x0000:  a036 9f8f 10aa
19:33:05.970441 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 56) fe80::201:c0ff:fe09:c062 > ff02::1: [icmp6 sum ok] ICMP6, router advertisement, length 56
        hop limit 64, Flags [none], pref medium, router lifetime 1800s, reachable time 0s, retrans time 0s
          source link-address option (1), length 8 (1): 00:01:c0:09:c0:62
            0x0000:  0001 c009 c062
          prefix info option (3), length 32 (4): 2603:3004:a:31e3::/64, Flags [onlink, auto], valid time 2592000s, pref. time 604800s
            0x0000:  40c0 0027 8d00 0009 3a80 0000 0000 2603
            0x0010:  3004 000a 31e3 0000 0000 0000 0000
19:33:06.100544 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 56) fe80::201:c0ff:fe09:c062 > ff02::1: [icmp6 sum ok] ICMP6, router advertisement, length 56
        hop limit 64, Flags [none], pref medium, router lifetime 1800s, reachable time 0s, retrans time 0s
          source link-address option (1), length 8 (1): 00:01:c0:09:c0:62
            0x0000:  0001 c009 c062
          prefix info option (3), length 32 (4): 2603:3004:a:31e3::/64, Flags [onlink, auto], valid time 2592000s, pref. time 604800s
            0x0000:  40c0 0027 8d00 0009 3a80 0000 0000 2603
            0x0010:  3004 000a 31e3 0000 0000 0000 0000
19:33:26.205754 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 32) 2603:3004:a:31e3:3e1e:52c1:5c11:3b60 > ff02::1:ff09:c062: [icmp6 sum ok] ICMP6, neighbor solicitation, length 32, who has fe80::201:c0ff:fe09:c062
          source link-address option (1), length 8 (1): a0:36:9f:8f:10:aa
            0x0000:  a036 9f8f 10aa
19:33:26.205909 IP6 (hlim 255, next-header ICMPv6 (58) payload length: 32) 2603:3004:a:31e3::1 > 2603:3004:a:31e3:3e1e:52c1:5c11:3b60: [icmp6 sum ok] ICMP6, neighbor advertisement, length 32, tgt is fe80::201:c0ff:fe09:c062, Flags [router, solicited, override]
          destination link-address option (2), length 8 (1): 00:01:c0:09:c0:62
            0x0000:  0001 c009 c062
19:33:26.205932 IP6 (class 0xb8, hlim 64, next-header UDP (17) payload length: 56) 2603:3004:a:31e3:3e1e:52c1:5c11:3b60.ntp > 2604:880:50:6f::ffff:54.ntp: [udp sum ok] NTPv4, length 48
        Client, Leap indicator:  (0), Stratum 2 (secondary reference), poll 6 (64s), precision -21
        Root Delay: 0.068450, Root dispersion: 0.036056, Reference-ID: time-b.timefreq.bldrdoc.gov
          Reference Timestamp:  3716072697.276009363 (2017/10/03 19:24:57)
          Originator Timestamp: 3716073010.303099730 (2017/10/03 19:30:10)
          Receive Timestamp:    3716073010.289069027 (2017/10/03 19:30:10)
          Transmit Timestamp:   3716073206.205734693 (2017/10/03 19:33:26)
            Originator - Receive Timestamp:  -0.014030702
            Originator - Transmit Timestamp: +195.902634963
19:33:26.285297 IP6 (class 0x20, flowlabel 0x97c40, hlim 50, next-header UDP (17) payload length: 56) 2604:880:50:6f::ffff:54.ntp > 2603:3004:a:31e3:3e1e:52c1:5c11:3b60.ntp: [udp sum ok] NTPv4, length 48
        Server, Leap indicator:  (0), Stratum 4 (secondary reference), poll 6 (64s), precision -22
        Root Delay: 0.209106, Root dispersion: 0.022521, Reference-ID: 109-204-69-224.iit.mops2.co.uk
          Reference Timestamp:  3716073205.696514338 (2017/10/03 19:33:25)
          Originator Timestamp: 3716073206.205734693 (2017/10/03 19:33:26)
          Receive Timestamp:    3716073206.301316960 (2017/10/03 19:33:26)
          Transmit Timestamp:   3716073206.301352374 (2017/10/03 19:33:26)
            Originator - Receive Timestamp:  +0.095582266
            Originator - Transmit Timestamp: +0.095617681
19:33:35.735035 IP6 (flowlabel 0x79739, hlim 255, next-header UDP (17) payload length: 85) fe80::9b:3157:7848:8e75.mdns > ff02::fb.mdns: [udp sum ok] 0 [1a] PTR (QU)? _printopia._tcp.local. _printopia._tcp.local. PTR HisashiM-bM-^@M-^Ys MacBook Pro._printopia._tcp.local. (77)
19:33:36.741794 IP6 (flowlabel 0x79739, hlim 255, next-header UDP (17) payload length: 85) fe80::9b:3157:7848:8e75.mdns > ff02::fb.mdns: [udp sum ok] 0 [1a] PTR (QM)? _printopia._tcp.local. _printopia._tcp.local. PTR HisashiM-bM-^@M-^Ys MacBook Pro._printopia._tcp.local. (77)
19:33:39.752059 IP6 (flowlabel 0x79739, hlim 255, next-header UDP (17) payload length: 85) fe80::9b:3157:7848:8e75.mdns > ff02::fb.mdns: [udp sum ok] 0 [1a] PTR (QM)? _printopia._tcp.local. _printopia._tcp.local. PTR HisashiM-bM-^@M-^Ys MacBook Pro._printopia._tcp.local. (77)
^C
19 packets captured
208 packets received by filter
0 packets dropped by kernel
References:
- Re: kern/52439: ipv6 stops routing randomly
  - From: Roy Marples
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