From digitalocean04.ring.nlnog.net: amazon@digitalocean04:~$ ping6 -v -n -c 30 -s 1200 excalibur.prolixium.com. PING excalibur.prolixium.com.(2620:6:2000:104::48) 1200 data bytes 1208 bytes from 2620:6:2000:104::48: icmp_seq=1 ttl=56 time=1.83 ms 1208 bytes from 2620:6:2000:104::48: icmp_seq=2 ttl=58 time=2.07 ms 1208 bytes from 2620:6:2000:104::48: icmp_seq=3 ttl=56 time=1.86 ms 1208 bytes from 2620:6:2000:104::48: icmp_seq=4 ttl=58 time=2.18 ms 1208 bytes from 2620:6:2000:104::48: icmp_seq=5 ttl=58 time=2.13 ms 1208 bytes from 2620:6:2000:104::48: icmp_seq=6 ttl=57 time=2.16 ms 1208 bytes from 2620:6:2000:104::48: icmp_seq=7 ttl=56 time=1.86 ms 1208 bytes from 2620:6:2000:104::48: icmp_seq=8 ttl=58 time=1.95 ms 1208 bytes from 2620:6:2000:104::48: icmp_seq=9 ttl=58 time=2.00 ms 1208 bytes from 2620:6:2000:104::48: icmp_seq=10 ttl=57 time=1.99 ms 1208 bytes from 2620:6:2000:104::48: icmp_seq=11 ttl=57 time=2.09 ms 1208 bytes from 2620:6:2000:104::48: icmp_seq=12 ttl=58 time=2.07 ms 1208 bytes from 2620:6:2000:104::48: icmp_seq=13 ttl=56 time=1.85 ms 1208 bytes from 2620:6:2000:104::48: icmp_seq=14 ttl=57 time=2.06 ms 1208 bytes from 2620:6:2000:104::48: icmp_seq=15 ttl=56 time=1.86 ms 1208 bytes from 2620:6:2000:104::48: icmp_seq=16 ttl=56 time=1.86 ms 1208 bytes from 2620:6:2000:104::48: icmp_seq=17 ttl=56 time=1.84 ms From 2001:19f0:1000::6c3d:f806 icmp_seq=18 Time exceeded: Hop limit <--- 2001:19f0:1000::6c3d:f806 resolves to vl23-er1.pnj1.choopa.net. 1208 bytes from 2620:6:2000:104::48: icmp_seq=19 ttl=57 time=2.00 ms 1208 bytes from 2620:6:2000:104::48: icmp_seq=20 ttl=57 time=2.21 ms From 2001:19f0:1000::6c3d:f80d icmp_seq=21 Time exceeded: Hop limit <--- 2001:19f0:1000::6c3d:f80d resolves to vl24-er2.pnj1.choopa.net. From 2001:19f0:1000::6c3d:f806 icmp_seq=22 Time exceeded: Hop limit 1208 bytes from 2620:6:2000:104::48: icmp_seq=23 ttl=58 time=1.99 ms 1208 bytes from 2620:6:2000:104::48: icmp_seq=24 ttl=57 time=2.02 ms From 2001:19f0:1000::6c3d:f806 icmp_seq=25 Time exceeded: Hop limit From 2001:19f0:1000::6c3d:f80d icmp_seq=26 Time exceeded: Hop limit 1208 bytes from 2620:6:2000:104::48: icmp_seq=27 ttl=58 time=2.02 ms 1208 bytes from 2620:6:2000:104::48: icmp_seq=28 ttl=58 time=2.08 ms 1208 bytes from 2620:6:2000:104::48: icmp_seq=29 ttl=56 time=1.83 ms From 2001:19f0:1000::6c3d:f80d icmp_seq=30 Time exceeded: Hop limit --- excalibur.prolixium.com. ping statistics --- 30 packets transmitted, 24 received, +6 errors, 20% packet loss, time 29042ms rtt min/avg/max/mdev = 1.833/1.997/2.211/0.119 ms amazon@digitalocean04:~$ FWIW, here's a traceroute where you can see one of the hops that has problems: amazon@digitalocean04:~$ traceroute6 -I -q1 excalibur.prolixium.com. traceroute to excalibur.prolixium.com (2620:6:2000:104::48) from 2604:a880:800:10::2f27:c001, 30 hops max, 60 bytes packets 1 2604:a880:800:10:ffff:ffff:ffff:fff2 (2604:a880:800:10:ffff:ffff:ffff:fff2) 0.669 ms 2 2604:a880:ffff:0:1::21 (2604:a880:ffff:0:1::21) 0.313 ms 3 2604:a880:ffff:c::5d (2604:a880:ffff:c::5d) 1.006 ms 4 nyiix.gi3-6.cr1.nyc1.choopa.net (2001:504:1::a502:473:1) 1.847 ms 5 vl50-br1.pnj1.choopa.net (2001:19f0:1000::6c3d:f4c9) 2.065 ms 6 ethernet1-2-1-c4-13-b2-1.pnj1.choopa.net (2001:19f0:1000::6c3d:50aa) 1.837 ms 7 vl50-br1.pnj1.choopa.net (2001:19f0:1000::6c3d:f4c9) 2.133 ms 8 vl24-er2.pnj1.choopa.net (2001:19f0:1000::6c3d:f80d) 9.652 ms <-------------one of the bad hops 9 excalibur.prolixium.com (2620:6:2000:104::48) 1.766 ms tcpdump on excalibur (note missing sequences 18, 21, 22, 25, 26, 30) (excalibur:15:53:EDT)% sudo tcpdump -v -i eth0 ip6 and host digitalocean04.ring.nlnog.net. tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes 15:53:22.908637 IP6 (flowlabel 0x94c78, hlim 58, next-header ICMPv6 (58) payload length: 1208) 2604:a880:800:10::2f27:c001 > excalibur.prolixium.com: [icmp6 sum ok] ICMP6, echo request, seq 1 15:53:22.908662 IP6 (flowlabel 0x67768, hlim 64, next-header ICMPv6 (58) payload length: 1208) excalibur.prolixium.com > 2604:a880:800:10::2f27:c001: [icmp6 sum ok] ICMP6, echo reply, seq 1 15:53:23.910700 IP6 (flowlabel 0x94c78, hlim 56, next-header ICMPv6 (58) payload length: 1208) 2604:a880:800:10::2f27:c001 > excalibur.prolixium.com: [icmp6 sum ok] ICMP6, echo request, seq 2 15:53:23.910724 IP6 (flowlabel 0x67768, hlim 64, next-header ICMPv6 (58) payload length: 1208) excalibur.prolixium.com > 2604:a880:800:10::2f27:c001: [icmp6 sum ok] ICMP6, echo reply, seq 2 15:53:24.911906 IP6 (flowlabel 0x94c78, hlim 58, next-header ICMPv6 (58) payload length: 1208) 2604:a880:800:10::2f27:c001 > excalibur.prolixium.com: [icmp6 sum ok] ICMP6, echo request, seq 3 15:53:24.911918 IP6 (flowlabel 0x67768, hlim 64, next-header ICMPv6 (58) payload length: 1208) excalibur.prolixium.com > 2604:a880:800:10::2f27:c001: [icmp6 sum ok] ICMP6, echo reply, seq 3 15:53:25.913999 IP6 (flowlabel 0x94c78, hlim 58, next-header ICMPv6 (58) payload length: 1208) 2604:a880:800:10::2f27:c001 > excalibur.prolixium.com: [icmp6 sum ok] ICMP6, echo request, seq 4 15:53:25.914024 IP6 (flowlabel 0x67768, hlim 64, next-header ICMPv6 (58) payload length: 1208) excalibur.prolixium.com > 2604:a880:800:10::2f27:c001: [icmp6 sum ok] ICMP6, echo reply, seq 4 15:53:26.915317 IP6 (flowlabel 0x94c78, hlim 58, next-header ICMPv6 (58) payload length: 1208) 2604:a880:800:10::2f27:c001 > excalibur.prolixium.com: [icmp6 sum ok] ICMP6, echo request, seq 5 15:53:26.915345 IP6 (flowlabel 0x67768, hlim 64, next-header ICMPv6 (58) payload length: 1208) excalibur.prolixium.com > 2604:a880:800:10::2f27:c001: [icmp6 sum ok] ICMP6, echo reply, seq 5 15:53:27.916675 IP6 (flowlabel 0x94c78, hlim 56, next-header ICMPv6 (58) payload length: 1208) 2604:a880:800:10::2f27:c001 > excalibur.prolixium.com: [icmp6 sum ok] ICMP6, echo request, seq 6 15:53:27.916698 IP6 (flowlabel 0x67768, hlim 64, next-header ICMPv6 (58) payload length: 1208) excalibur.prolixium.com > 2604:a880:800:10::2f27:c001: [icmp6 sum ok] ICMP6, echo reply, seq 6 15:53:28.917878 IP6 (flowlabel 0x94c78, hlim 56, next-header ICMPv6 (58) payload length: 1208) 2604:a880:800:10::2f27:c001 > excalibur.prolixium.com: [icmp6 sum ok] ICMP6, echo request, seq 7 15:53:28.917901 IP6 (flowlabel 0x67768, hlim 64, next-header ICMPv6 (58) payload length: 1208) excalibur.prolixium.com > 2604:a880:800:10::2f27:c001: [icmp6 sum ok] ICMP6, echo reply, seq 7 15:53:29.919803 IP6 (flowlabel 0x94c78, hlim 58, next-header ICMPv6 (58) payload length: 1208) 2604:a880:800:10::2f27:c001 > excalibur.prolixium.com: [icmp6 sum ok] ICMP6, echo request, seq 8 15:53:29.919841 IP6 (flowlabel 0x67768, hlim 64, next-header ICMPv6 (58) payload length: 1208) excalibur.prolixium.com > 2604:a880:800:10::2f27:c001: [icmp6 sum ok] ICMP6, echo reply, seq 8 15:53:30.921078 IP6 (flowlabel 0x94c78, hlim 56, next-header ICMPv6 (58) payload length: 1208) 2604:a880:800:10::2f27:c001 > excalibur.prolixium.com: [icmp6 sum ok] ICMP6, echo request, seq 9 15:53:30.921103 IP6 (flowlabel 0x67768, hlim 64, next-header ICMPv6 (58) payload length: 1208) excalibur.prolixium.com > 2604:a880:800:10::2f27:c001: [icmp6 sum ok] ICMP6, echo reply, seq 9 15:53:31.922250 IP6 (flowlabel 0x94c78, hlim 56, next-header ICMPv6 (58) payload length: 1208) 2604:a880:800:10::2f27:c001 > excalibur.prolixium.com: [icmp6 sum ok] ICMP6, echo request, seq 10 15:53:31.922273 IP6 (flowlabel 0x67768, hlim 64, next-header ICMPv6 (58) payload length: 1208) excalibur.prolixium.com > 2604:a880:800:10::2f27:c001: [icmp6 sum ok] ICMP6, echo reply, seq 10 15:53:32.923365 IP6 (flowlabel 0x94c78, hlim 56, next-header ICMPv6 (58) payload length: 1208) 2604:a880:800:10::2f27:c001 > excalibur.prolixium.com: [icmp6 sum ok] ICMP6, echo request, seq 11 15:53:32.923399 IP6 (flowlabel 0x67768, hlim 64, next-header ICMPv6 (58) payload length: 1208) excalibur.prolixium.com > 2604:a880:800:10::2f27:c001: [icmp6 sum ok] ICMP6, echo reply, seq 11 15:53:33.924596 IP6 (flowlabel 0x94c78, hlim 56, next-header ICMPv6 (58) payload length: 1208) 2604:a880:800:10::2f27:c001 > excalibur.prolixium.com: [icmp6 sum ok] ICMP6, echo request, seq 12 15:53:33.924620 IP6 (flowlabel 0x67768, hlim 64, next-header ICMPv6 (58) payload length: 1208) excalibur.prolixium.com > 2604:a880:800:10::2f27:c001: [icmp6 sum ok] ICMP6, echo reply, seq 12 15:53:34.925790 IP6 (flowlabel 0x94c78, hlim 56, next-header ICMPv6 (58) payload length: 1208) 2604:a880:800:10::2f27:c001 > excalibur.prolixium.com: [icmp6 sum ok] ICMP6, echo request, seq 13 15:53:34.925814 IP6 (flowlabel 0x67768, hlim 64, next-header ICMPv6 (58) payload length: 1208) excalibur.prolixium.com > 2604:a880:800:10::2f27:c001: [icmp6 sum ok] ICMP6, echo reply, seq 13 15:53:35.927827 IP6 (flowlabel 0x94c78, hlim 58, next-header ICMPv6 (58) payload length: 1208) 2604:a880:800:10::2f27:c001 > excalibur.prolixium.com: [icmp6 sum ok] ICMP6, echo request, seq 14 15:53:35.927851 IP6 (flowlabel 0x67768, hlim 64, next-header ICMPv6 (58) payload length: 1208) excalibur.prolixium.com > 2604:a880:800:10::2f27:c001: [icmp6 sum ok] ICMP6, echo reply, seq 14 15:53:36.929032 IP6 (flowlabel 0x94c78, hlim 56, next-header ICMPv6 (58) payload length: 1208) 2604:a880:800:10::2f27:c001 > excalibur.prolixium.com: [icmp6 sum ok] ICMP6, echo request, seq 15 15:53:36.929056 IP6 (flowlabel 0x67768, hlim 64, next-header ICMPv6 (58) payload length: 1208) excalibur.prolixium.com > 2604:a880:800:10::2f27:c001: [icmp6 sum ok] ICMP6, echo reply, seq 15 15:53:37.931088 IP6 (flowlabel 0x94c78, hlim 58, next-header ICMPv6 (58) payload length: 1208) 2604:a880:800:10::2f27:c001 > excalibur.prolixium.com: [icmp6 sum ok] ICMP6, echo request, seq 16 15:53:37.931113 IP6 (flowlabel 0x67768, hlim 64, next-header ICMPv6 (58) payload length: 1208) excalibur.prolixium.com > 2604:a880:800:10::2f27:c001: [icmp6 sum ok] ICMP6, echo reply, seq 16 15:53:38.932974 IP6 (flowlabel 0x94c78, hlim 58, next-header ICMPv6 (58) payload length: 1208) 2604:a880:800:10::2f27:c001 > excalibur.prolixium.com: [icmp6 sum ok] ICMP6, echo request, seq 17 15:53:38.932988 IP6 (flowlabel 0x67768, hlim 64, next-header ICMPv6 (58) payload length: 1208) excalibur.prolixium.com > 2604:a880:800:10::2f27:c001: [icmp6 sum ok] ICMP6, echo reply, seq 17 15:53:40.936305 IP6 (flowlabel 0x94c78, hlim 58, next-header ICMPv6 (58) payload length: 1208) 2604:a880:800:10::2f27:c001 > excalibur.prolixium.com: [icmp6 sum ok] ICMP6, echo request, seq 19 15:53:40.936328 IP6 (flowlabel 0x67768, hlim 64, next-header ICMPv6 (58) payload length: 1208) excalibur.prolixium.com > 2604:a880:800:10::2f27:c001: [icmp6 sum ok] ICMP6, echo reply, seq 19 15:53:41.937511 IP6 (flowlabel 0x94c78, hlim 50, next-header ICMPv6 (58) payload length: 1208) 2604:a880:800:10::2f27:c001 > excalibur.prolixium.com: [icmp6 sum ok] ICMP6, echo request, seq 20 15:53:41.937534 IP6 (flowlabel 0x67768, hlim 64, next-header ICMPv6 (58) payload length: 1208) excalibur.prolixium.com > 2604:a880:800:10::2f27:c001: [icmp6 sum ok] ICMP6, echo reply, seq 20 15:53:44.941698 IP6 (flowlabel 0x94c78, hlim 56, next-header ICMPv6 (58) payload length: 1208) 2604:a880:800:10::2f27:c001 > excalibur.prolixium.com: [icmp6 sum ok] ICMP6, echo request, seq 23 15:53:44.941722 IP6 (flowlabel 0x67768, hlim 64, next-header ICMPv6 (58) payload length: 1208) excalibur.prolixium.com > 2604:a880:800:10::2f27:c001: [icmp6 sum ok] ICMP6, echo reply, seq 23 15:53:45.942772 IP6 (flowlabel 0x94c78, hlim 58, next-header ICMPv6 (58) payload length: 1208) 2604:a880:800:10::2f27:c001 > excalibur.prolixium.com: [icmp6 sum ok] ICMP6, echo request, seq 24 15:53:45.942794 IP6 (flowlabel 0x67768, hlim 64, next-header ICMPv6 (58) payload length: 1208) excalibur.prolixium.com > 2604:a880:800:10::2f27:c001: [icmp6 sum ok] ICMP6, echo reply, seq 24 15:53:48.946594 IP6 (flowlabel 0x94c78, hlim 56, next-header ICMPv6 (58) payload length: 1208) 2604:a880:800:10::2f27:c001 > excalibur.prolixium.com: [icmp6 sum ok] ICMP6, echo request, seq 27 15:53:48.946617 IP6 (flowlabel 0x67768, hlim 64, next-header ICMPv6 (58) payload length: 1208) excalibur.prolixium.com > 2604:a880:800:10::2f27:c001: [icmp6 sum ok] ICMP6, echo reply, seq 27 15:53:49.947789 IP6 (flowlabel 0x94c78, hlim 56, next-header ICMPv6 (58) payload length: 1208) 2604:a880:800:10::2f27:c001 > excalibur.prolixium.com: [icmp6 sum ok] ICMP6, echo request, seq 28 15:53:49.947812 IP6 (flowlabel 0x67768, hlim 64, next-header ICMPv6 (58) payload length: 1208) excalibur.prolixium.com > 2604:a880:800:10::2f27:c001: [icmp6 sum ok] ICMP6, echo reply, seq 28 15:53:50.948972 IP6 (flowlabel 0x94c78, hlim 58, next-header ICMPv6 (58) payload length: 1208) 2604:a880:800:10::2f27:c001 > excalibur.prolixium.com: [icmp6 sum ok] ICMP6, echo request, seq 29 15:53:50.948984 IP6 (flowlabel 0x67768, hlim 64, next-header ICMPv6 (58) payload length: 1208) excalibur.prolixium.com > 2604:a880:800:10::2f27:c001: [icmp6 sum ok] ICMP6, echo reply, seq 29