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Author Topic: Why i can't acess this address [2001:470:83f2::710:1]  (Read 5481 times)

reene2008

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Why i can't acess this address [2001:470:83f2::710:1]
« on: June 21, 2011, 09:19:01 AM »

Pinging 2001:470:83f2::710:1 with 32 bytes of data:
Reply from 2001:470:83f2::710:1: TTL expired in transit.
Reply from 2001:470:83f2::710:1: TTL expired in transit.
Reply from 2001:470:83f2::710:1: TTL expired in transit.


The traceroute log shows there is loop between gige-gbge0.tserv3.fmt2.ipv6.he.net (2001:470:0:45::2) and 2001:470:1f05:46b:: (2001:470:1f05:46b::) ,
why does this happen ?
Code: [Select]
root@my-router:~# traceroute6 2001:470:83f2::710:1
traceroute to 2001:470:83f2::710:1 (2001:470:83f2::710:1) from 2001:470:xx:xxx::
2, 30 hops max, 16 byte packets
 1 xxxxxxxx 462.937 ms  459.782 ms  464.646 ms
 2  gige-g3-13.core1.hkg1.he.net (2001:470:0:ba::1)  471.736 ms  454.966 ms  445
.224 ms
 3  gige-g3-7.core1.lax1.he.net (2001:470:0:16b::1)  601.472 ms  608.056 ms  623
.774 ms
 4  10gigabitethernet7-3.core1.fmt2.he.net (2001:470:0:18d::1)  631.305 ms  621.
736 ms  629.472 ms
 5  gige-gbge0.tserv3.fmt2.ipv6.he.net (2001:470:0:45::2)  629.212 ms  616.926 m
s  601.104 ms
 6  2001:470:1f05:46b:: (2001:470:1f05:46b::)  610.83 ms  623.354 ms *
 7  gige-gbge0.tserv3.fmt2.ipv6.he.net (2001:470:0:45::2)  644.836 ms  645.523 m
s  642.865 ms
 8  2001:470:1f05:46b:: (2001:470:1f05:46b::)  643.052 ms  639.863 ms  652.648 m
s
 9  * gige-gbge0.tserv3.fmt2.ipv6.he.net (2001:470:0:45::2)  767.077 ms  762.82
ms
10  2001:470:1f05:46b:: (2001:470:1f05:46b::)  756.582 ms  791.653 ms  775.611 m
s
11  gige-gbge0.tserv3.fmt2.ipv6.he.net (2001:470:0:45::2)  777.414 ms  773.525 m
s  783.549 ms
12  2001:470:1f05:46b:: (2001:470:1f05:46b::)  778.206 ms  767.727 ms  778.52 ms
  789.084 mse0.tserv3.fmt2.ipv6.he.net (2001:470:0:45::2)  786.86 ms  782.569 ms
14  2001:470:1f05:46b:: (2001:470:1f05:46b::)  795.179 ms *  795.656 ms
15  gige-gbge0.tserv3.fmt2.ipv6.he.net (2001:470:0:45::2)  800.597 ms  795.223 m
s  796.268 ms
16  * 2001:470:1f05:46b:: (2001:470:1f05:46b::)  815.287 ms  805.07 ms
17  gige-gbge0.tserv3.fmt2.ipv6.he.net (2001:470:0:45::2)  814.652 ms *  816.663
 ms
18  2001:470:1f05:46b:: (2001:470:1f05:46b::)  799.654 ms  801.1 ms  813.977 ms
19  gige-gbge0.tserv3.fmt2.ipv6.he.net (2001:470:0:45::2)  830.469 ms  824.854 m
s  800.938 ms
20  * 2001:470:1f05:46b:: (2001:470:1f05:46b::)  838.427 ms *
21  gige-gbge0.tserv3.fmt2.ipv6.he.net (2001:470:0:45::2)  843.727 ms  820.448 m
s  822.849 ms
22  2001:470:1f05:46b:: (2001:470:1f05:46b::)  837.593 ms *

« Last Edit: July 06, 2011, 07:50:16 AM by reene2008 »
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cholzhauer

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Re: Why i can't acess this address [2001:470:83f2::710:1]
« Reply #1 on: June 21, 2011, 09:24:49 AM »

It does look like there's a routing loop

Who/what is 2001:470:83f2::710:1?

Looks like an HE address, so I'd email ipv6@he.net and let them know.

And, no need to block out IP addresses, makes troubleshooting much harder
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johnpoz

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Re: Why i can't acess this address [2001:470:83f2::710:1]
« Reply #2 on: June 22, 2011, 09:42:34 AM »

Man thats some crazy latency to the first hop as well.

1 xxxxxxxx 462.937 ms  459.782 ms  464.646 ms
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kcochran

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Re: Why i can't acess this address [2001:470:83f2::710:1]
« Reply #3 on: June 23, 2011, 05:12:43 AM »

That high of an address off a tserv would be a routed /48.  If it's being kicked back to the tserv, that means the person who it's routed to doesn't have a route for it themselves and is left with going to default (back to the tserv).
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reene2008

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Re: Why i can't acess this address [2001:470:83f2::710:1]
« Reply #4 on: July 06, 2011, 07:52:53 AM »

Man thats some crazy latency to the first hop as well.

1 xxxxxxxx 462.937 ms  459.782 ms  464.646 ms
Yes,I'm in China, and connect from home to the he.net Tunnel Server in US, so the latency can't be low...

Sigh~  :(
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snarked

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Re: Why i can't acess this address [2001:470:83f2::710:1]
« Reply #5 on: July 06, 2011, 11:04:26 AM »

There are closer tunnel endpoints than the U.S. for you:  Hong Kong and Singapore.
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hunreal

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Re: Why i can't acess this address [2001:470:83f2::710:1]
« Reply #6 on: July 09, 2011, 08:54:21 AM »

There are closer tunnel endpoints than the U.S. for you:  Hong Kong and Singapore.

Most US endpoints are better than HK or SG for China user. Chinese internet sux!
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snarked

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Re: Why i can't acess this address [2001:470:83f2::710:1]
« Reply #7 on: July 09, 2011, 05:51:24 PM »

That may be true once network topography is determined, but there's no way any of us can tell that for him (except if we have a direct peering with his network).
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reene2008

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Re: Why i can't acess this address [2001:470:83f2::710:1]
« Reply #8 on: July 13, 2011, 10:08:50 AM »

There are closer tunnel endpoints than the U.S. for you:  Hong Kong and Singapore.

Most US endpoints are better than HK or SG for China user. Chinese internet sux!

Yes, you are right, I checked the ping result of those endpoints, the US endpoint is better, so i selected it.
I'm using a 10M fiber FTTH connection direct to my home, it's fast enough to open the websites in China, but the connection to US is poor.
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