Good morning,
is anyone from sbb.ch reading here? https://sbb.ch does not load on IPv6 for us. It seems that packets > 1420 bytes are dropped inside the SBB network, Local PMTU / fragmentation seems to work, my local outgoing MTU is 1420. MTR below. Best, Nico [10:23] line:~% mtr -w -c1 -s 1500 sbb.ch Start: 2019-03-12T10:24:17+0100 HOST: line Loss% Snt Last Avg Best Wrst StDev 1.|-- 2a0a:e5c1:111:111::42 0.0% 1 11.2 11.2 11.2 11.2 0.0 2.|-- ??? 100.0 1 0.0 0.0 0.0 0.0 0.0 3.|-- 2a0a:e5c0:2:12::7 0.0% 1 69.8 69.8 69.8 69.8 0.0 4.|-- 2a0a:e5c0:1:1::9 0.0% 1 74.3 74.3 74.3 74.3 0.0 5.|-- 2001:1620:20e6::1 0.0% 1 69.4 69.4 69.4 69.4 0.0 6.|-- r1zrh2.core.init7.net 0.0% 1 69.1 69.1 69.1 69.1 0.0 7.|-- r1olt2.core.init7.net 0.0% 1 58.0 58.0 58.0 58.0 0.0 8.|-- r1brn1.core.init7.net 0.0% 1 62.8 62.8 62.8 62.8 0.0 9.|-- r2brn1.core.init7.net 0.0% 1 65.4 65.4 65.4 65.4 0.0 10.|-- r1epe1.core.init7.net 0.0% 1 75.2 75.2 75.2 75.2 0.0 11.|-- r1qls1.core.init7.net 0.0% 1 78.4 78.4 78.4 78.4 0.0 12.|-- r1gva3.core.init7.net 0.0% 1 81.0 81.0 81.0 81.0 0.0 13.|-- gw-sunrise.init7.net 0.0% 1 64.4 64.4 64.4 64.4 0.0 14.|-- 2001:1700:1:7:120::2 0.0% 1 84.4 84.4 84.4 84.4 0.0 15.|-- 2001:1700:4d00:2::2 0.0% 1 81.3 81.3 81.3 81.3 0.0 16.|-- 2a00:4bc0:ffff:ff00::1d 0.0% 1 67.0 67.0 67.0 67.0 0.0 17.|-- ??? 100.0 1 0.0 0.0 0.0 0.0 0.0 [10:24] line:~% mtr -w -c1 -s 1400 sbb.ch Start: 2019-03-12T10:24:35+0100 HOST: line Loss% Snt Last Avg Best Wrst StDev 1.|-- 2a0a:e5c1:111:111::42 0.0% 1 3.2 3.2 3.2 3.2 0.0 2.|-- 2a0a:e5c1:100::1 0.0% 1 69.0 69.0 69.0 69.0 0.0 3.|-- 2a0a:e5c0:2:12::7 0.0% 1 74.7 74.7 74.7 74.7 0.0 4.|-- 2a0a:e5c0:1:1::9 0.0% 1 69.9 69.9 69.9 69.9 0.0 5.|-- 2001:1620:20e6::1 0.0% 1 60.5 60.5 60.5 60.5 0.0 6.|-- r1zrh2.core.init7.net 0.0% 1 75.3 75.3 75.3 75.3 0.0 7.|-- r1olt2.core.init7.net 0.0% 1 70.7 70.7 70.7 70.7 0.0 8.|-- r1brn1.core.init7.net 0.0% 1 69.1 69.1 69.1 69.1 0.0 9.|-- r2brn1.core.init7.net 0.0% 1 54.6 54.6 54.6 54.6 0.0 10.|-- r1epe1.core.init7.net 0.0% 1 75.9 75.9 75.9 75.9 0.0 11.|-- r1qls1.core.init7.net 0.0% 1 78.8 78.8 78.8 78.8 0.0 12.|-- r1gva3.core.init7.net 0.0% 1 79.8 79.8 79.8 79.8 0.0 13.|-- gw-sunrise.init7.net 0.0% 1 69.9 69.9 69.9 69.9 0.0 14.|-- 2001:1700:1:7:120::2 0.0% 1 77.5 77.5 77.5 77.5 0.0 15.|-- 2001:1700:4d00:2::2 0.0% 1 59.3 59.3 59.3 59.3 0.0 16.|-- 2a00:4bc0:ffff:ff00::1d 0.0% 1 70.1 70.1 70.1 70.1 0.0 17.|-- ??? 100.0 1 0.0 0.0 0.0 0.0 0.0 18.|-- ??? 100.0 1 0.0 0.0 0.0 0.0 0.0 19.|-- ??? 100.0 1 0.0 0.0 0.0 0.0 0.0 20.|-- ??? 100.0 1 0.0 0.0 0.0 0.0 0.0 21.|-- ??? 100.0 1 0.0 0.0 0.0 0.0 0.0 22.|-- ??? 100.0 1 0.0 0.0 0.0 0.0 0.0 23.|-- ??? 100.0 1 0.0 0.0 0.0 0.0 0.0 24.|-- ??? 100.0 1 0.0 0.0 0.0 0.0 0.0 25.|-- 2a00:4bc0:ffff:ffff::c296:f58e 0.0% 1 58.3 58.3 58.3 58.3 0.0 [10:24] line:~% [10:25] line:~% mtr -w -c1 -s 1420 sbb.ch Start: 2019-03-12T10:25:44+0100 HOST: line Loss% Snt Last Avg Best Wrst StDev 1.|-- 2a0a:e5c1:111:111::42 0.0% 1 16.3 16.3 16.3 16.3 0.0 2.|-- 2a0a:e5c1:100::1 0.0% 1 77.0 77.0 77.0 77.0 0.0 3.|-- 2a0a:e5c0:2:12::7 0.0% 1 67.0 67.0 67.0 67.0 0.0 4.|-- 2a0a:e5c0:1:1::9 0.0% 1 66.7 66.7 66.7 66.7 0.0 5.|-- 2001:1620:20e6::1 0.0% 1 78.8 78.8 78.8 78.8 0.0 6.|-- r1zrh2.core.init7.net 0.0% 1 64.5 64.5 64.5 64.5 0.0 7.|-- r1olt2.core.init7.net 0.0% 1 68.3 68.3 68.3 68.3 0.0 8.|-- r1brn1.core.init7.net 0.0% 1 74.9 74.9 74.9 74.9 0.0 9.|-- r2brn1.core.init7.net 0.0% 1 73.6 73.6 73.6 73.6 0.0 10.|-- r1epe1.core.init7.net 0.0% 1 62.2 62.2 62.2 62.2 0.0 11.|-- r1qls1.core.init7.net 0.0% 1 74.3 74.3 74.3 74.3 0.0 12.|-- r1gva3.core.init7.net 0.0% 1 63.6 63.6 63.6 63.6 0.0 13.|-- gw-sunrise.init7.net 0.0% 1 69.1 69.1 69.1 69.1 0.0 14.|-- 2001:1700:1:7:120::2 0.0% 1 77.4 77.4 77.4 77.4 0.0 15.|-- 2001:1700:4d00:2::2 0.0% 1 78.8 78.8 78.8 78.8 0.0 16.|-- 2a00:4bc0:ffff:ff00::1d 0.0% 1 75.7 75.7 75.7 75.7 0.0 17.|-- ??? 100.0 1 0.0 0.0 0.0 0.0 0.0 18.|-- ??? 100.0 1 0.0 0.0 0.0 0.0 0.0 19.|-- ??? 100.0 1 0.0 0.0 0.0 0.0 0.0 20.|-- ??? 100.0 1 0.0 0.0 0.0 0.0 0.0 21.|-- ??? 100.0 1 0.0 0.0 0.0 0.0 0.0 22.|-- ??? 100.0 1 0.0 0.0 0.0 0.0 0.0 23.|-- ??? 100.0 1 0.0 0.0 0.0 0.0 0.0 24.|-- ??? 100.0 1 0.0 0.0 0.0 0.0 0.0 25.|-- 2a00:4bc0:ffff:ffff::c296:f58e 0.0% 1 83.8 83.8 83.8 83.8 0.0 [10:25] line:~% mtr -w -c1 -s 1430 sbb.ch Start: 2019-03-12T10:25:55+0100 HOST: line Loss% Snt Last Avg Best Wrst StDev 1.|-- 2a0a:e5c1:111:111::42 0.0% 1 7.3 7.3 7.3 7.3 0.0 2.|-- ??? 100.0 1 0.0 0.0 0.0 0.0 0.0 3.|-- 2a0a:e5c0:2:12::7 0.0% 1 60.4 60.4 60.4 60.4 0.0 4.|-- 2a0a:e5c0:1:1::9 0.0% 1 61.9 61.9 61.9 61.9 0.0 5.|-- 2001:1620:20e6::1 0.0% 1 72.2 72.2 72.2 72.2 0.0 6.|-- r1zrh2.core.init7.net 0.0% 1 65.2 65.2 65.2 65.2 0.0 7.|-- r1olt2.core.init7.net 0.0% 1 64.9 64.9 64.9 64.9 0.0 8.|-- r1brn1.core.init7.net 0.0% 1 64.9 64.9 64.9 64.9 0.0 9.|-- r2brn1.core.init7.net 0.0% 1 71.7 71.7 71.7 71.7 0.0 10.|-- r1epe1.core.init7.net 0.0% 1 64.4 64.4 64.4 64.4 0.0 11.|-- r1qls1.core.init7.net 0.0% 1 63.2 63.2 63.2 63.2 0.0 12.|-- r1gva3.core.init7.net 0.0% 1 77.9 77.9 77.9 77.9 0.0 13.|-- gw-sunrise.init7.net 0.0% 1 64.5 64.5 64.5 64.5 0.0 14.|-- 2001:1700:1:7:120::2 0.0% 1 63.5 63.5 63.5 63.5 0.0 15.|-- 2001:1700:4d00:2::2 0.0% 1 81.7 81.7 81.7 81.7 0.0 16.|-- 2a00:4bc0:ffff:ff00::1d 0.0% 1 74.4 74.4 74.4 74.4 0.0 17.|-- ??? 100.0 1 0.0 0.0 0.0 0.0 0.0 [10:26] line:~% icmp6, frag works locally: 10:29:44.919328 IP6 2a0a:e5c1:111:111:3185:e802:6548:658c > 2a00:4bc0:ffff:ffff::c296:f58e: frag (0|1368) ICMP6, echo request, seq 33000, length 1368 10:29:44.919368 IP6 2a0a:e5c1:111:111:3185:e802:6548:658c > 2a00:4bc0:ffff:ffff::c296:f58e: frag (1368|92) -- Your Swiss, Open Source and IPv6 Virtual Machine. 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