Network: destiny -> Ethernet -> starfire -> -> dax -> -> Test 1 (works): (destiny:10:51)% wget -O /dev/null https://plus.google.com/ --2014-11-08 10:51:19-- https://plus.google.com/ Resolving plus.google.com (plus.google.com)... 2607:f8b0:4005:802::1006, 74.125.239.142, 74.125.239.128, ... Connecting to plus.google.com (plus.google.com)|2607:f8b0:4005:802::1006|:443... connected. HTTP request sent, awaiting response... 302 Moved Temporarily Location: https://accounts.google.com/ServiceLogin?service=oz&passive=1209600&continue=https://plus.google.com/?gpsrc%3Dgplp0 [following] --2014-11-08 10:51:20-- https://accounts.google.com/ServiceLogin?service=oz&passive=1209600&continue=https://plus.google.com/?gpsrc%3Dgplp0 Resolving accounts.google.com (accounts.google.com)... 2607:f8b0:400e:c04::54, 74.125.28.84 Connecting to accounts.google.com (accounts.google.com)|2607:f8b0:400e:c04::54|:443... connected. HTTP request sent, awaiting response... 200 OK Length: unspecified [text/html] Saving to: ‘/dev/null’ [ <=> ] 50,520 114KB/s in 0.4s Test 1 tcpdump on destiny: 10:51:19.708621 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934 > 2607:f8b0:4005:802::1006.443: Flags [S], seq 2409264441, win 14400, options [mss 1440,sackOK,TS val 756569275 ecr 0,nop,wscale 7], length 0 10:51:19.874739 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934: Flags [S.], seq 4124544949, ack 2409264442, win 28560, options [mss 1440,sackOK,TS val 3392457932 ecr 756569275,nop,wscale 7], length 0 10:51:19.874768 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934 > 2607:f8b0:4005:802::1006.443: Flags [.], ack 1, win 113, options [nop,nop,TS val 756569317 ecr 3392457932], length 0 10:51:19.875064 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934 > 2607:f8b0:4005:802::1006.443: Flags [P.], seq 1:279, ack 1, win 113, options [nop,nop,TS val 756569317 ecr 3392457932], length 278 10:51:20.040402 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934: Flags [.], ack 279, win 232, options [nop,nop,TS val 3392458097 ecr 756569317], length 0 10:51:20.041369 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934: Flags [P.], seq 2857:3900, ack 279, win 232, options [nop,nop,TS val 3392458098 ecr 756569317], length 1043 10:51:20.041418 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934 > 2607:f8b0:4005:802::1006.443: Flags [.], ack 1, win 113, options [nop,nop,TS val 756569358 ecr 3392458097,nop,nop,sack 1 {2857:3900}], length 0 10:51:20.111982 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934: Flags [.], seq 1:1209, ack 279, win 232, options [nop,nop,TS val 3392458169 ecr 756569317], length 1208 10:51:20.112029 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934 > 2607:f8b0:4005:802::1006.443: Flags [.], ack 1209, win 135, options [nop,nop,TS val 756569376 ecr 3392458169,nop,nop,sack 1 {2857:3900}], length 0 10:51:20.112515 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934: Flags [.], seq 1209:2417, ack 279, win 232, options [nop,nop,TS val 3392458169 ecr 756569317], length 1208 10:51:20.112557 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934 > 2607:f8b0:4005:802::1006.443: Flags [.], ack 2417, win 158, options [nop,nop,TS val 756569376 ecr 3392458169,nop,nop,sack 1 {2857:3900}], length 0 10:51:20.112976 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934: Flags [.], seq 2417:3625, ack 279, win 232, options [nop,nop,TS val 3392458169 ecr 756569317], length 1208 10:51:20.113066 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934 > 2607:f8b0:4005:802::1006.443: Flags [.], ack 3900, win 180, options [nop,nop,TS val 756569376 ecr 3392458169,nop,nop,sack 1 {2857:3625}], length 0 10:51:20.113237 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934: Flags [P.], seq 3625:3900, ack 279, win 232, options [nop,nop,TS val 3392458169 ecr 756569317], length 275 10:51:20.113254 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934 > 2607:f8b0:4005:802::1006.443: Flags [.], ack 3900, win 180, options [nop,nop,TS val 756569376 ecr 3392458169,nop,nop,sack 1 {3625:3900}], length 0 10:51:20.116056 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934 > 2607:f8b0:4005:802::1006.443: Flags [P.], seq 279:405, ack 3900, win 180, options [nop,nop,TS val 756569377 ecr 3392458169], length 126 10:51:20.285003 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934: Flags [P.], seq 3900:4146, ack 405, win 232, options [nop,nop,TS val 3392458343 ecr 756569377], length 246 10:51:20.286773 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934 > 2607:f8b0:4005:802::1006.443: Flags [P.], seq 405:547, ack 4146, win 199, options [nop,nop,TS val 756569420 ecr 3392458343], length 142 10:51:20.493442 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934: Flags [.], ack 547, win 240, options [nop,nop,TS val 3392458550 ecr 756569420], length 0 10:51:20.531051 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934: Flags [P.], seq 4146:5338, ack 547, win 240, options [nop,nop,TS val 3392458587 ecr 756569420], length 1192 10:51:20.531284 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934: Flags [P.], seq 5338:5403, ack 547, win 240, options [nop,nop,TS val 3392458587 ecr 756569420], length 65 10:51:20.531302 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934 > 2607:f8b0:4005:802::1006.443: Flags [.], ack 5403, win 221, options [nop,nop,TS val 756569481 ecr 3392458587], length 0 10:51:21.309936 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934 > 2607:f8b0:4005:802::1006.443: Flags [F.], seq 547, ack 5403, win 221, options [nop,nop,TS val 756569675 ecr 3392458587], length 0 10:51:21.479169 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934: Flags [F.], seq 5403, ack 548, win 240, options [nop,nop,TS val 3392459537 ecr 756569675], length 0 10:51:21.479199 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934 > 2607:f8b0:4005:802::1006.443: Flags [.], ack 5404, win 221, options [nop,nop,TS val 756569718 ecr 3392459537], length 0 Test 1 tcpdump on dax (external interface): 13:51:19.772784 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934 > 2607:f8b0:4005:802::1006.443: Flags [S], seq 2409264441, win 14400, options [mss 1440,sackOK,TS val 756569275 ecr 0,nop,wscale 7], length 0 13:51:19.841707 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934: Flags [S.], seq 4124544949, ack 2409264442, win 28560, options [mss 1440,sackOK,TS val 3392457932 ecr 756569275,nop,wscale 7], length 0 13:51:19.938694 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934 > 2607:f8b0:4005:802::1006.443: Flags [.], ack 1, win 113, options [nop,nop,TS val 756569317 ecr 3392457932], length 0 13:51:19.938845 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934 > 2607:f8b0:4005:802::1006.443: Flags [P.], seq 1:279, ack 1, win 113, options [nop,nop,TS val 756569317 ecr 3392457932], length 278 13:51:20.007747 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934: Flags [.], ack 279, win 232, options [nop,nop,TS val 3392458097 ecr 756569317], length 0 13:51:20.008059 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934: Flags [.], seq 1:1429, ack 279, win 232, options [nop,nop,TS val 3392458098 ecr 756569317], length 1428 13:51:20.008092 IP6 2001:48c8:1:2::2 > 2607:f8b0:4005:802::1006: ICMP6, packet too big, mtu 1280, length 1240 13:51:20.008183 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934: Flags [.], seq 1429:2857, ack 279, win 232, options [nop,nop,TS val 3392458098 ecr 756569317], length 1428 13:51:20.008185 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934: Flags [P.], seq 2857:3900, ack 279, win 232, options [nop,nop,TS val 3392458098 ecr 756569317], length 1043 13:51:20.008222 IP6 2001:48c8:1:2::2 > 2607:f8b0:4005:802::1006: ICMP6, packet too big, mtu 1280, length 1240 13:51:20.078622 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934: Flags [.], seq 1:1209, ack 279, win 232, options [nop,nop,TS val 3392458169 ecr 756569317], length 1208 13:51:20.078745 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934: Flags [.], seq 1209:2417, ack 279, win 232, options [nop,nop,TS val 3392458169 ecr 756569317], length 1208 13:51:20.078749 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934: Flags [.], seq 2417:3625, ack 279, win 232, options [nop,nop,TS val 3392458169 ecr 756569317], length 1208 13:51:20.078750 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934: Flags [P.], seq 3625:3900, ack 279, win 232, options [nop,nop,TS val 3392458169 ecr 756569317], length 275 13:51:20.104821 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934 > 2607:f8b0:4005:802::1006.443: Flags [.], ack 1, win 113, options [nop,nop,TS val 756569358 ecr 3392458097,nop,nop,sack 1 {2857:3900}], length 0 13:51:20.177428 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934 > 2607:f8b0:4005:802::1006.443: Flags [.], ack 1209, win 135, options [nop,nop,TS val 756569376 ecr 3392458169,nop,nop,sack 1 {2857:3900}], length 0 13:51:20.178852 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934 > 2607:f8b0:4005:802::1006.443: Flags [.], ack 2417, win 158, options [nop,nop,TS val 756569376 ecr 3392458169,nop,nop,sack 1 {2857:3900}], length 0 13:51:20.183109 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934 > 2607:f8b0:4005:802::1006.443: Flags [.], ack 3900, win 180, options [nop,nop,TS val 756569376 ecr 3392458169,nop,nop,sack 1 {2857:3625}], length 0 13:51:20.183132 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934 > 2607:f8b0:4005:802::1006.443: Flags [.], ack 3900, win 180, options [nop,nop,TS val 756569376 ecr 3392458169,nop,nop,sack 1 {3625:3900}], length 0 13:51:20.183157 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934 > 2607:f8b0:4005:802::1006.443: Flags [P.], seq 279:405, ack 3900, win 180, options [nop,nop,TS val 756569377 ecr 3392458169], length 126 13:51:20.252332 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934: Flags [P.], seq 3900:4146, ack 405, win 232, options [nop,nop,TS val 3392458343 ecr 756569377], length 246 13:51:20.351366 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934 > 2607:f8b0:4005:802::1006.443: Flags [P.], seq 405:547, ack 4146, win 199, options [nop,nop,TS val 756569420 ecr 3392458343], length 142 13:51:20.460620 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934: Flags [.], ack 547, win 240, options [nop,nop,TS val 3392458550 ecr 756569420], length 0 13:51:20.497746 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934: Flags [P.], seq 4146:5338, ack 547, win 240, options [nop,nop,TS val 3392458587 ecr 756569420], length 1192 13:51:20.497749 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934: Flags [P.], seq 5338:5403, ack 547, win 240, options [nop,nop,TS val 3392458587 ecr 756569420], length 65 13:51:20.595008 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934 > 2607:f8b0:4005:802::1006.443: Flags [.], ack 5403, win 221, options [nop,nop,TS val 756569481 ecr 3392458587], length 0 13:51:21.377611 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934 > 2607:f8b0:4005:802::1006.443: Flags [F.], seq 547, ack 5403, win 221, options [nop,nop,TS val 756569675 ecr 3392458587], length 0 13:51:21.446540 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934: Flags [F.], seq 5403, ack 548, win 240, options [nop,nop,TS val 3392459537 ecr 756569675], length 0 13:51:21.543033 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33934 > 2607:f8b0:4005:802::1006.443: Flags [.], ack 5404, win 221, options [nop,nop,TS val 756569718 ecr 3392459537], length 0 Conclusion: The PTB messages above lowered the packet length from the Google server, GOOD. Test 2 (a few seconds later.. but didn't work): (destiny:10:51)% wget -O /dev/null https://plus.google.com/ --2014-11-08 10:51:33-- https://plus.google.com/ Resolving plus.google.com (plus.google.com)... 2607:f8b0:4005:802::1006, 74.125.239.129, 74.125.239.130, ... Connecting to plus.google.com (plus.google.com)|2607:f8b0:4005:802::1006|:443... connected. [... wget hangs ...] Test 2 tcpdump on destiny: 10:51:33.519231 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936 > 2607:f8b0:4005:802::1006.443: Flags [S], seq 2344545118, win 14400, options [mss 1440,sackOK,TS val 756572728 ecr 0,nop,wscale 7], length 0 10:51:33.690397 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936: Flags [S.], seq 3108063435, ack 2344545119, win 28560, options [mss 1440,sackOK,TS val 3392470766 ecr 756572728,nop,wscale 7], length 0 10:51:33.690434 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936 > 2607:f8b0:4005:802::1006.443: Flags [.], ack 1, win 113, options [nop,nop,TS val 756572770 ecr 3392470766], length 0 10:51:33.690777 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936 > 2607:f8b0:4005:802::1006.443: Flags [P.], seq 1:279, ack 1, win 113, options [nop,nop,TS val 756572771 ecr 3392470766], length 278 10:51:33.864398 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936: Flags [.], ack 279, win 232, options [nop,nop,TS val 3392470945 ecr 756572771], length 0 10:51:33.865550 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936: Flags [P.], seq 2857:3900, ack 279, win 232, options [nop,nop,TS val 3392470945 ecr 756572771], length 1043 10:51:33.865631 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936 > 2607:f8b0:4005:802::1006.443: Flags [.], ack 1, win 113, options [nop,nop,TS val 756572814 ecr 3392470945,nop,nop,sack 1 {2857:3900}], length 0 10:51:43.860936 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936: Flags [F.], seq 3900, ack 279, win 232, options [nop,nop,TS val 3392480940 ecr 756572814], length 0 10:51:43.860967 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936 > 2607:f8b0:4005:802::1006.443: Flags [.], ack 1, win 113, options [nop,nop,TS val 756575313 ecr 3392470945,nop,nop,sack 1 {2857:3901}], length 0 Test 2 tcpdump on dax (external interface): 13:51:33.582607 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936 > 2607:f8b0:4005:802::1006.443: Flags [S], seq 2344545118, win 14400, options [mss 1440,sackOK,TS val 756572728 ecr 0,nop,wscale 7], length 0 13:51:33.657474 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936: Flags [S.], seq 3108063435, ack 2344545119, win 28560, options [mss 1440,sackOK,TS val 3392470766 ecr 756572728,nop,wscale 7], length 0 13:51:33.754885 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936 > 2607:f8b0:4005:802::1006.443: Flags [.], ack 1, win 113, options [nop,nop,TS val 756572770 ecr 3392470766], length 0 13:51:33.760802 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936 > 2607:f8b0:4005:802::1006.443: Flags [P.], seq 1:279, ack 1, win 113, options [nop,nop,TS val 756572771 ecr 3392470766], length 278 13:51:33.831694 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936: Flags [.], ack 279, win 232, options [nop,nop,TS val 3392470945 ecr 756572771], length 0 13:51:33.832134 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936: Flags [.], seq 1:1429, ack 279, win 232, options [nop,nop,TS val 3392470945 ecr 756572771], length 1428 13:51:33.832175 IP6 2001:48c8:1:2::2 > 2607:f8b0:4005:802::1006: ICMP6, packet too big, mtu 1280, length 1240 13:51:33.832261 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936: Flags [.], seq 1429:2857, ack 279, win 232, options [nop,nop,TS val 3392470945 ecr 756572771], length 1428 13:51:33.832264 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936: Flags [P.], seq 2857:3900, ack 279, win 232, options [nop,nop,TS val 3392470945 ecr 756572771], length 1043 13:51:33.832298 IP6 2001:48c8:1:2::2 > 2607:f8b0:4005:802::1006: ICMP6, packet too big, mtu 1280, length 1240 13:51:33.930681 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936 > 2607:f8b0:4005:802::1006.443: Flags [.], ack 1, win 113, options [nop,nop,TS val 756572814 ecr 3392470945,nop,nop,sack 1 {2857:3900}], length 0 13:51:34.046018 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936: Flags [.], seq 1:1429, ack 279, win 232, options [nop,nop,TS val 3392471158 ecr 756572814], length 1428 13:51:34.046055 IP6 2001:48c8:1:2::2 > 2607:f8b0:4005:802::1006: ICMP6, packet too big, mtu 1280, length 1240 13:51:34.046142 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936: Flags [.], seq 1429:2857, ack 279, win 232, options [nop,nop,TS val 3392471158 ecr 756572814], length 1428 13:51:34.046171 IP6 2001:48c8:1:2::2 > 2607:f8b0:4005:802::1006: ICMP6, packet too big, mtu 1280, length 1240 13:51:34.562579 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936: Flags [.], seq 1:1429, ack 279, win 232, options [nop,nop,TS val 3392471676 ecr 756572814], length 1428 13:51:34.562620 IP6 2001:48c8:1:2::2 > 2607:f8b0:4005:802::1006: ICMP6, packet too big, mtu 1280, length 1240 13:51:35.599565 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936: Flags [.], seq 1:1429, ack 279, win 232, options [nop,nop,TS val 3392472712 ecr 756572814], length 1428 13:51:35.599607 IP6 2001:48c8:1:2::2 > 2607:f8b0:4005:802::1006: ICMP6, packet too big, mtu 1280, length 1240 13:51:37.671851 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936: Flags [.], seq 1:1429, ack 279, win 232, options [nop,nop,TS val 3392474784 ecr 756572814], length 1428 13:51:37.671891 IP6 2001:48c8:1:2::2 > 2607:f8b0:4005:802::1006: ICMP6, packet too big, mtu 1280, length 1240 13:51:41.815576 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936: Flags [.], seq 1:1429, ack 279, win 232, options [nop,nop,TS val 3392478928 ecr 756572814], length 1428 13:51:41.815625 IP6 2001:48c8:1:2::2 > 2607:f8b0:4005:802::1006: ICMP6, packet too big, mtu 1280, length 1240 13:51:43.827957 IP6 2607:f8b0:4005:802::1006.443 > 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936: Flags [F.], seq 3900, ack 279, win 232, options [nop,nop,TS val 3392480940 ecr 756572814], length 0 13:51:43.926111 IP6 2001:48c8:1:105:21c:c0ff:feb2:8dbd.33936 > 2607:f8b0:4005:802::1006.443: Flags [.], ack 1, win 113, options [nop,nop,TS val 756575313 ecr 3392470945,nop,nop,sack 1 {2857:3901}], length 0 Conclusion: PTB messages were ignored by Google and segments that were too big to fit into the tunnel kept being received, FAIL.