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[tufinhas]

  2    48 ms    47 ms    48 ms  dragoon-1.tunnel.tserv5.lon1.ipv6.he.net [2001:470:1f08:3c7::1]
  3    48 ms    47 ms    48 ms  gige-g4-6.core1.lon1.he.net [2001:470:0:67::1]
  4    56 ms    56 ms    64 ms  10gigabitethernet1-1.core1.ams1.he.net [2001:470:0:3f::2]
  5   316 ms   374 ms   317 ms  pr61.ams04.net.google.com [2001:7f8:1::a501:5169:1]
  6     *        *        *     O pedido excedeu o tempo.
  7   318 ms   317 ms   322 ms  2001:4860:0:1001::68



using lg.he.net
NL:
Tracing the route to IPv6 node 2001:4860:0:1001::68 from 1 to 30 hops

  1    <1 ms   <1 ms   <1 ms 2001:7f8:1::a501:5169:1
  2    *       *       *     ?
  3     5 ms    3 ms    3 ms 2001:4860:0:1001::68
Storing [core1.ams1.he.net trace ipv6 2001:4860:0:1001::68]

UK:
Tracing the route to IPv6 node 2001:4860:0:1001::68 from 1 to 30 hops

  1     8 ms    8 ms    8 ms 2001:470:0:3f::2
  2   271 ms  278 ms  278 ms 2001:7f8:1::a501:5169:1
  3    *       *       *     ?
  4   270 ms  271 ms  278 ms 2001:4860:0:1001::68
Storing [core1.lon1.he.net trace ipv6 2001:4860:0:1001::68]

[broquea]

Most likely congestion on Google's side of things. From what I can tell from these traces, the issues start outside of our network where we hand off.

I've also noticed lately that you cannot ping them directly or traceroute6 as they throw up a !X (administratively denied).

[piojan]

This is how it looks like from an other tunnel end

traceroute to ipv6.l.google.com (2001:4860:0:1001::68) from 2001:470:1f0a:555::2, 30 hops max, 16 byte packets
 1  piojan.tunnel.tserv6.fra1.ipv6.he.net (2001:470:1f0a:555::1)  39.597 ms  39.845 ms  43.547 ms
 2  gige-g2-4.core1.fra1.he.net (2001:470:0:69::1)  40.628 ms  43.994 ms  57.007 ms
 3  10gigabitethernet1-4.core1.ams1.he.net (2001:470:0:47::1)  78.991 ms  71.642 ms  50.803 ms
 4  pr61.ams04.net.google.com (2001:7f8:1::a501:5169:1)  358.68 ms !S  319.88 ms !S  378.78 ms !S

From your LG at FRA:
  1    14 ms    7 ms    7 ms 2001:470:0:47::1  (10gigabitethernet1-4.core1.ams1.he.net)
  2   287 ms  272 ms  272 ms 2001:7f8:1::a501:5169:1 (pr61.ams04.net.google.com)
  3    *       *       *     ?
  4   284 ms  285 ms  286 ms 2001:4860:0:1001::68

The delay starts from pr61.ams04.net.google.com (2001:7f8:1::a501:5169:1) which is there router at ams-ix.

If we ping the above ipv6 from FRA we have:
round-trip min/avg/max=292/292/292 ms

From London:
round-trip min/avg/max=274/274/274 ms

However from AMS he router:
round-trip min/avg/max=0/0/0 ms

Also this problem don't exist with other providers - for eg:
Hop  Node                         Loss%  Sent   Last   Avg  Best Worst StDev       ASN        Organisation
  1. 2001:838:1:1::1               0.0%     5    0.5   0.5   0.4   0.5   0.0     12871      Concepts ICT
     ge-1-3-0.breda.ipv6.concepts-ict.net.
  2. 2001:838:0:10::1              0.0%     5    2.6   3.1   2.4   5.3   1.3     12871      Concepts ICT
  3. 2001:7f8:1::a501:5169:1       0.0%     5    3.4   3.6   3.4   3.8   0.1                AMS-IX-IPV6
     pr61.ams04.net.google.com.
  4.                           100.0     5    0.0   0.0   0.0   0.0   0.0   
  5. 2001:4860:0:1001::68          0.0%     5    6.8   6.7   6.5   6.8   0.1     15169      Google Inc.

or:
Hop  Node                         Loss%  Sent   Last   Avg  Best Worst StDev       ASN        Organisation
  1. 2001:960:800::1               0.0%     5    0.7   0.8   0.7   1.0   0.1     12634      Cybercomm
     ge-0-5-800.juniper-1.ipv6.network.scarlet.nl.
  2. 2001:7f8:1::a501:5169:1       0.0%     5    1.3   1.3   1.2   1.4   0.1                AMS-IX-IPV6
     pr61.ams04.net.google.com.
  3. 2001:7f8:1::a501:5169:1       0.0%     5    1.4   1.4   1.2   1.4   0.1                AMS-IX-IPV6
     pr61.ams04.net.google.com.
  4.                           100.0     5    0.0   0.0   0.0   0.0   0.0   
  5. 2001:4860:0:1001::68          0.0%     5    4.4   4.5   4.1   5.3   0.5     15169      Google Inc.

I am just wondering if there isn't a problem with peering.
You are directing traffic to them through ams but they are not returning it through there.
(something with there bgp or peering).


Edited:

Hop  Node                         Loss%  Sent   Last   Avg  Best Worst StDev       ASN        Organisation
  1. 2001:a60:0:200::1             0.0%     5    1.2   1.2   1.0   1.4   0.1     8767       
     rt4.muc1.m-online.net.
  2. 2001:a60::69:0:1:1            0.0%     5    9.8  10.3   9.8  10.6   0.3     8767       
     rt-decix.m-online.net.
  3. 2001:470:0:47::1              0.0%     5   34.0  29.0  16.9  39.0   9.5                Hurricane Electric
     10gigabitethernet1-4.core1.ams1.he.net.
  4. 2001:7f8:1::a501:5169:1       0.0%     5   21.3  20.1  16.3  29.8   5.9                AMS-IX-IPV6
     pr61.ams04.net.google.com.
  5.                           100.0     5    0.0   0.0   0.0   0.0   0.0   
  6. 2001:4860:0:1001::68          0.0%     5   23.8  20.3  19.1  23.8   2.0     15169      Google Inc.

This might suggest that there is no problem for the traffic that you are theres transit.
So mayby the problem with google could be narrowed to your prefix only?