packetloss over IPv6 tunnel

[jeremyhu]

My tunnel is configured, and I'm able to browse ipv6 websites, but at a poor speed.  On investigation, i noticed that I get bad packetloss to the other end of the tunnel when using its IPv6 address, but I don't get that packet loss when using IPv4.  I'm using an Apple Airport Extreme Base Station as the local end of my tunnel.  It seems configured ok (I can browse/ping6 ipv6.google.com), so I'm wondering what might be causing this packetloss if the IPv4 pipe is actually reliable...

(21:42:38 Sat Oct 23 2010 jeremy@nanake i386)
~  $ ping6 2001:470:1f04:140b::1
PING6(56=40+8+8 bytes) 2001:470:1f05:140b::2 --> 2001:470:1f04:140b::1
16 bytes from 2001:470:1f04:140b::1, icmp_seq=0 hlim=63 time=23.245 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=1 hlim=63 time=23.562 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=2 hlim=63 time=23.630 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=3 hlim=63 time=25.236 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=4 hlim=63 time=23.587 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=5 hlim=63 time=23.494 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=6 hlim=63 time=25.161 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=7 hlim=63 time=21.525 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=8 hlim=63 time=24.426 ms
Request timeout for icmp_seq=9
16 bytes from 2001:470:1f04:140b::1, icmp_seq=10 hlim=63 time=21.970 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=11 hlim=63 time=24.552 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=12 hlim=63 time=22.628 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=13 hlim=63 time=22.544 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=14 hlim=63 time=23.994 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=15 hlim=63 time=24.574 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=16 hlim=63 time=23.197 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=17 hlim=63 time=24.909 ms
Request timeout for icmp_seq=18
16 bytes from 2001:470:1f04:140b::1, icmp_seq=19 hlim=63 time=23.444 ms
Request timeout for icmp_seq=20
Request timeout for icmp_seq=21
16 bytes from 2001:470:1f04:140b::1, icmp_seq=22 hlim=63 time=23.745 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=23 hlim=63 time=24.630 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=24 hlim=63 time=25.397 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=25 hlim=63 time=23.526 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=26 hlim=63 time=24.621 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=27 hlim=63 time=24.958 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=28 hlim=63 time=22.582 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=29 hlim=63 time=24.276 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=30 hlim=63 time=24.351 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=31 hlim=63 time=23.644 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=32 hlim=63 time=23.804 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=33 hlim=63 time=24.711 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=34 hlim=63 time=22.788 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=35 hlim=63 time=23.405 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=36 hlim=63 time=24.920 ms
^C
--- 2001:470:1f04:140b::1 ping6 statistics ---
38 packets transmitted, 33 packets received, 13.2% packet loss
round-trip min/avg/max/std-dev = 21.525/23.850/25.397/0.950 ms


(21:43:27 Sat Oct 23 2010 jeremy@nanake i386)
~  $ ping 72.52.104.74
PING 72.52.104.74 (72.52.104.74): 56 data bytes
64 bytes from 72.52.104.74: icmp_seq=0 ttl=54 time=18.422 ms
64 bytes from 72.52.104.74: icmp_seq=1 ttl=54 time=21.950 ms
64 bytes from 72.52.104.74: icmp_seq=2 ttl=54 time=17.325 ms
64 bytes from 72.52.104.74: icmp_seq=3 ttl=54 time=20.722 ms
64 bytes from 72.52.104.74: icmp_seq=4 ttl=54 time=18.620 ms
64 bytes from 72.52.104.74: icmp_seq=5 ttl=54 time=16.988 ms
64 bytes from 72.52.104.74: icmp_seq=6 ttl=54 time=17.430 ms
64 bytes from 72.52.104.74: icmp_seq=7 ttl=54 time=18.467 ms
64 bytes from 72.52.104.74: icmp_seq=8 ttl=54 time=16.841 ms
64 bytes from 72.52.104.74: icmp_seq=9 ttl=54 time=17.303 ms
64 bytes from 72.52.104.74: icmp_seq=10 ttl=54 time=17.724 ms
64 bytes from 72.52.104.74: icmp_seq=11 ttl=54 time=18.471 ms
64 bytes from 72.52.104.74: icmp_seq=12 ttl=54 time=16.544 ms
64 bytes from 72.52.104.74: icmp_seq=13 ttl=54 time=17.394 ms
64 bytes from 72.52.104.74: icmp_seq=14 ttl=54 time=17.964 ms
64 bytes from 72.52.104.74: icmp_seq=15 ttl=54 time=26.369 ms
64 bytes from 72.52.104.74: icmp_seq=16 ttl=54 time=19.156 ms
64 bytes from 72.52.104.74: icmp_seq=17 ttl=54 time=18.189 ms
64 bytes from 72.52.104.74: icmp_seq=18 ttl=54 time=18.006 ms
64 bytes from 72.52.104.74: icmp_seq=19 ttl=54 time=18.812 ms
64 bytes from 72.52.104.74: icmp_seq=20 ttl=54 time=16.846 ms
64 bytes from 72.52.104.74: icmp_seq=21 ttl=54 time=17.462 ms
64 bytes from 72.52.104.74: icmp_seq=22 ttl=54 time=18.271 ms
64 bytes from 72.52.104.74: icmp_seq=23 ttl=54 time=16.601 ms
64 bytes from 72.52.104.74: icmp_seq=24 ttl=54 time=22.397 ms
64 bytes from 72.52.104.74: icmp_seq=25 ttl=54 time=17.689 ms
64 bytes from 72.52.104.74: icmp_seq=26 ttl=54 time=29.906 ms
64 bytes from 72.52.104.74: icmp_seq=27 ttl=54 time=16.649 ms
64 bytes from 72.52.104.74: icmp_seq=28 ttl=54 time=17.314 ms
64 bytes from 72.52.104.74: icmp_seq=29 ttl=54 time=17.811 ms
64 bytes from 72.52.104.74: icmp_seq=30 ttl=54 time=18.431 ms
64 bytes from 72.52.104.74: icmp_seq=31 ttl=54 time=16.744 ms
64 bytes from 72.52.104.74: icmp_seq=32 ttl=54 time=17.478 ms
64 bytes from 72.52.104.74: icmp_seq=33 ttl=54 time=17.833 ms
64 bytes from 72.52.104.74: icmp_seq=34 ttl=54 time=18.501 ms
64 bytes from 72.52.104.74: icmp_seq=35 ttl=54 time=16.950 ms
64 bytes from 72.52.104.74: icmp_seq=36 ttl=54 time=17.708 ms
64 bytes from 72.52.104.74: icmp_seq=37 ttl=54 time=18.250 ms
64 bytes from 72.52.104.74: icmp_seq=38 ttl=54 time=16.514 ms
64 bytes from 72.52.104.74: icmp_seq=39 ttl=54 time=16.936 ms
64 bytes from 72.52.104.74: icmp_seq=40 ttl=54 time=24.744 ms
64 bytes from 72.52.104.74: icmp_seq=41 ttl=54 time=18.070 ms
^C
--- 72.52.104.74 ping statistics ---
42 packets transmitted, 42 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 16.514/18.614/29.906/2.699 ms

[lukec]

What's the mtu set to on your tunnel interface?
Can't see the "drop" as you appear to not to respond to ICMP from your end of the tunnel...
Regards
lukec

Code Select Expand

ping6 2001:470:1f04:140b::1
PING6(56=40+8+8 bytes) 2001:470:9313:0:224:81ff:fe07:99 --> 2001:470:1f04:140b::1
16 bytes from 2001:470:1f04:140b::1, icmp_seq=0 hlim=58 time=188.038 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=1 hlim=58 time=185.390 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=2 hlim=58 time=185.486 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=3 hlim=58 time=184.967 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=4 hlim=58 time=185.639 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=5 hlim=58 time=191.551 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=6 hlim=58 time=186.151 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=7 hlim=58 time=185.679 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=8 hlim=58 time=186.424 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=9 hlim=58 time=186.350 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=10 hlim=58 time=185.983 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=11 hlim=58 time=186.189 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=12 hlim=58 time=186.345 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=13 hlim=58 time=186.294 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=14 hlim=58 time=185.922 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=15 hlim=58 time=186.558 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=16 hlim=58 time=185.088 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=17 hlim=58 time=185.384 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=18 hlim=58 time=185.245 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=19 hlim=58 time=185.391 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=20 hlim=58 time=186.007 ms
^C
--- 2001:470:1f04:140b::1 ping6 statistics ---
21 packets transmitted, 21 packets received, 0.0% packet loss
round-trip min/avg/max/std-dev = 184.967/186.194/191.551/1.365 ms

lear# ping6 2001:470:1f04:140b::2
PING6(56=40+8+8 bytes) 2001:470:9313:0:224:81ff:fe07:99 --> 2001:470:1f04:140b::2
^C
--- 2001:470:1f04:140b::2 ping6 statistics ---
10 packets transmitted, 0 packets received, 100.0% packet loss


[jeremyhu]

It doesn't look like I can set (nor query) the MTU on my router, but the host originating the packets has 1500 ... I'm fairly confident that the router's MTU is probably also 1500.

It also sometimes takes a while to "warm up":

~  $ ping6 2001:470:1f04:140b::1
PING6(56=40+8+8 bytes) 2001:470:1f05:140b::2 --> 2001:470:1f04:140b::1
Request timeout for icmp_seq=0
Request timeout for icmp_seq=1
Request timeout for icmp_seq=2
Request timeout for icmp_seq=3
Request timeout for icmp_seq=4
Request timeout for icmp_seq=5
Request timeout for icmp_seq=6
Request timeout for icmp_seq=7
Request timeout for icmp_seq=8
Request timeout for icmp_seq=9
Request timeout for icmp_seq=10
Request timeout for icmp_seq=11
Request timeout for icmp_seq=12
Request timeout for icmp_seq=13
Request timeout for icmp_seq=14
Request timeout for icmp_seq=15
Request timeout for icmp_seq=16
Request timeout for icmp_seq=17
Request timeout for icmp_seq=18
Request timeout for icmp_seq=19
Request timeout for icmp_seq=20
Request timeout for icmp_seq=21
Request timeout for icmp_seq=22
Request timeout for icmp_seq=23
Request timeout for icmp_seq=24
Request timeout for icmp_seq=25
Request timeout for icmp_seq=26
16 bytes from 2001:470:1f04:140b::1, icmp_seq=27 hlim=63 time=110.395 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=28 hlim=63 time=17.676 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=29 hlim=63 time=22.738 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=30 hlim=63 time=16.702 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=31 hlim=63 time=17.598 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=32 hlim=63 time=18.192 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=33 hlim=63 time=16.675 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=34 hlim=63 time=17.599 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=35 hlim=63 time=18.267 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=36 hlim=63 time=16.641 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=37 hlim=63 time=27.193 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=38 hlim=63 time=18.286 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=39 hlim=63 time=23.151 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=40 hlim=63 time=17.451 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=41 hlim=63 time=18.288 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=42 hlim=63 time=16.555 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=43 hlim=63 time=17.435 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=44 hlim=63 time=18.223 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=45 hlim=63 time=16.677 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=46 hlim=63 time=17.304 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=47 hlim=63 time=18.166 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=48 hlim=63 time=16.691 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=49 hlim=63 time=17.119 ms
^C
--- 2001:470:1f04:140b::1 ping6 statistics ---
50 packets transmitted, 23 packets received, 54.0% packet loss
round-trip min/avg/max/std-dev = 16.555/22.392/110.395/18.928 ms

[jeremyhu]

Can't see the "drop" as you appear to not to respond to ICMP from your end of the tunnel...

Try again.  I had changed my configuration to use Comcast's 6to4, but I've changed it back to my HE tunnel now.

[lukec]

Here it is...Looks ok

Code Select Expand


16 bytes from 2001:470:1f04:140b::1, icmp_seq=0 hlim=58 time=186.993 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=1 hlim=58 time=185.843 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=2 hlim=58 time=185.747 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=3 hlim=58 time=186.140 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=4 hlim=58 time=185.433 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=5 hlim=58 time=186.458 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=6 hlim=58 time=186.589 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=7 hlim=58 time=186.212 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=8 hlim=58 time=186.224 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=9 hlim=58 time=184.805 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=10 hlim=58 time=185.834 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=11 hlim=58 time=189.301 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=12 hlim=58 time=185.801 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=13 hlim=58 time=185.854 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=14 hlim=58 time=185.431 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=15 hlim=58 time=185.666 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=16 hlim=58 time=187.599 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=17 hlim=58 time=186.018 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=18 hlim=58 time=185.858 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=19 hlim=58 time=184.758 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=20 hlim=58 time=186.226 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=21 hlim=58 time=186.957 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=22 hlim=58 time=185.634 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=23 hlim=58 time=185.533 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=24 hlim=58 time=186.578 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=25 hlim=58 time=185.689 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=26 hlim=58 time=187.726 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=27 hlim=58 time=187.280 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=28 hlim=58 time=185.769 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=29 hlim=58 time=186.431 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=30 hlim=58 time=184.950 ms
16 bytes from 2001:470:1f04:140b::1, icmp_seq=31 hlim=58 time=186.335 ms
^C
--- 2001:470:1f04:140b::1 ping6 statistics ---
33 packets transmitted, 32 packets received, 3.0% packet loss
round-trip min/avg/max/std-dev = 184.758/186.177/189.301/0.899 ms

Regards
lukec

[jeremyhu]

I never really got to the bottom of this issue, so I'm hoping to bring it back to life with some more info.

I'm outside my LAN, and I had difficulty sshing in using IPv6, so I got in using my IPv4 address.

From my machines on the LAN, I was able to ping6 ipv6.google.com with no issues.

From my external machine, I was able to ping6 the server end of the tunnel consistently, but I wasn't able to ping6 the client end.  Here is what I saw when trying to traceroute:

To the server end of the tunnel:

traceroute6 to 2001:470:1f04:140b::1 (2001:470:1f04:140b::1) from 2620::1b00:1311:214:51ff:fe66:41e2, 30 hops max, 12 byte packets
1  2620:0:1b00:1311::1  6.639 ms  1.326 ms  1.203 ms
2  2620:0:1b00:1507::1  1.524 ms  1.693 ms  2.294 ms
3  2620:0:1b00:1103::1  0.844 ms  0.468 ms  0.478 ms
4  2620:0:1b00:7::2  1.054 ms  0.98 ms  0.884 ms
5  2620:0:1b00:3::1  8.176 ms  0.975 ms  0.769 ms
6  Apple-1.tunnel.tserv1.fmt.ipv6.he.net  40.456 ms  219.75 ms  218.386 ms
7  v702.core1.fmt1.he.net  2.741 ms  2.306 ms  2.63 ms
8  gige-g4-8.core1.fmt2.he.net  12.247 ms  2.353 ms  2.436 ms
9  jeremyhu-1.tunnel.tserv3.fmt2.ipv6.he.net  5.91 ms  2.558 ms  6.401 ms

To the client end:

traceroute6 to 2001:470:1f04:140b::2 (2001:470:1f04:140b::2) from 2620::1b00:1311:214:51ff:fe66:41e2, 30 hops max, 12 byte packets
1  2620:0:1b00:1311::1  36.843 ms  1.065 ms  0.945 ms
2  2620:0:1b00:1507::1  1.737 ms  1.11 ms  2.029 ms
3  2620:0:1b00:1103::1  1.483 ms  0.433 ms  0.385 ms
4  2620:0:1b00:7::2  1.088 ms  0.945 ms  0.914 ms
5  2620:0:1b00:3::1  1.034 ms  0.969 ms  0.87 ms
6  Apple-1.tunnel.tserv1.fmt.ipv6.he.net  3.371 ms  2.726 ms  2.492 ms
7  v702.core1.fmt1.he.net  2.5 ms  2.33 ms  2.389 ms
8  gige-g4-8.core1.fmt2.he.net  2.429 ms  2.546 ms  12.35 ms
9  gige-gbge0.tserv3.fmt2.ipv6.he.net  7.872 ms  7.675 ms  7.231 ms
10  * * *
11  * * *
12  * * *
13  * * *
14  * * *
15  * * *
16  * * *
17  * * *
18  * * *
19  * * *
20  * * *
21  * * *

I was ping6ing two of my machines on my LAN from my external machine during this process and they show huge PL:

PING6(56=40+8+8 bytes) 2620::1b00:1311:214:51ff:fe66:41e2 --> 2001:470:1f05:140b::6
16 bytes from 2001:470:1f05:140b::6, icmp_seq=252 hlim=55 time=20.152 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=401 hlim=55 time=21.986 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=443 hlim=55 time=20.077 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=701 hlim=55 time=19.457 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=702 hlim=55 time=19.953 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=703 hlim=55 time=21.363 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=704 hlim=55 time=25.347 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=705 hlim=55 time=20.414 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=721 hlim=55 time=20.178 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=722 hlim=55 time=20.85 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=723 hlim=55 time=54.175 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=724 hlim=55 time=24.722 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=725 hlim=55 time=19.96 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=726 hlim=55 time=19.88 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=727 hlim=55 time=20.699 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=728 hlim=55 time=18.909 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=729 hlim=55 time=20.248 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=730 hlim=55 time=20.882 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=731 hlim=55 time=19.243 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=732 hlim=55 time=20.411 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=733 hlim=55 time=21.061 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=734 hlim=55 time=19.596 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=735 hlim=55 time=929.914 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=736 hlim=55 time=21.085 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=737 hlim=55 time=21.44 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=738 hlim=55 time=21.432 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=739 hlim=55 time=21.581 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=740 hlim=55 time=26.082 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=741 hlim=55 time=23.806 ms
16 bytes from 2001:470:1f05:140b::6, icmp_seq=742 hlim=55 time=30.052 ms
^C
--- cid.outersquare.org ping6 statistics ---
1172 packets transmitted, 30 packets received, 97% packet loss
round-trip min/avg/max = 18.909/52.832/929.914 ms

PING6(56=40+8+8 bytes) 2620::1b00:1311:214:51ff:fe66:41e2 --> 2001:470:1f05:140b::2
16 bytes from 2001:470:1f05:140b::2, icmp_seq=388 hlim=55 time=20.952 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=389 hlim=55 time=20.277 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=432 hlim=55 time=20.322 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=690 hlim=55 time=21.127 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=691 hlim=55 time=32.845 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=692 hlim=55 time=19.447 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=693 hlim=55 time=20.662 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=694 hlim=55 time=21.185 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=709 hlim=55 time=44.989 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=710 hlim=55 time=47.444 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=711 hlim=55 time=21.803 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=712 hlim=55 time=20.272 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=713 hlim=55 time=20.917 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=714 hlim=55 time=21.709 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=715 hlim=55 time=20.996 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=716 hlim=55 time=30.114 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=717 hlim=55 time=19.786 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=718 hlim=55 time=27.367 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=719 hlim=55 time=23.936 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=720 hlim=55 time=21.948 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=721 hlim=55 time=20.978 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=722 hlim=55 time=21.867 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=723 hlim=55 time=43.686 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=725 hlim=55 time=19.441 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=726 hlim=55 time=20.564 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=727 hlim=55 time=21.211 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=728 hlim=55 time=20.003 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=729 hlim=55 time=20.956 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=730 hlim=55 time=21.668 ms
16 bytes from 2001:470:1f05:140b::2, icmp_seq=731 hlim=55 time=24.2 ms
^C
--- nanake.outersquare.org ping6 statistics ---
1159 packets transmitted, 30 packets received, 97% packet loss
round-trip min/avg/max = 19.441/24.422/47.444 ms

[cconn]

I have packet loss to www.v6.facebook.com when using 6to4 (either my own or HE's), ipv6.google.com is fine.  I have no packet loss to either when using native v6 either over Cogent or HE.  I guess I'll find out on June 8th if its just me  :P