[SOLVED] have access to ipv6.google.com but not other ipv6 address

superweijiafeng · 12-03-2014, 01:28 AM

Briefly speaking, I have access to http://ipv6.google.com or some other ipv6 website. The ipv6 test website http://ipv6-test.com/ also says that I have both ipv4 and ipv6 connections.

The strange thing is I cannot access the other ipv6 website http://bt.neu6.edu.cn/. And the other guys in the same room using windows7 can readily log to it. I try to trace route to the two addresses. Below is the output:

Code:

$ traceroute ipv6.google.com traceroute to ipv6.google.com 
(2404:6800:4005:803::1001), 30 hops max, 80 byte packets 
1 2001:da8:1007:49a::2 (2001:da8:1007:49a::2) 17.807 ms 18.179 ms 18.321 ms 
2 2001:da8:1007:49a::1 (2001:da8:1007:49a::1) 0.472 ms 0.880 ms 0.896 ms 
3 2001:da8:1026:ffff::1 (2001:da8:1026:ffff::1) 1.707 ms 1.690 ms 1.701 ms 
4 * * * 
5 2001:da8:1:504::1 (2001:da8:1:504::1) 2.289 ms 2.060 ms 2.047 ms 
6 * * * 
7 bj-wh-v6.cernet2.net (2001:da8:1:1::1) 47.185 ms 47.191 ms 47.575 ms 
8 2001:252:0:1::101 (2001:252:0:1::101) 50.142 ms 49.821 ms 50.175 ms 
9 2001:252:0:100::2 (2001:252:0:100::2) 47.667 ms 46.710 ms 39.305 ms 
10 2001:252:0:302::2 (2001:252:0:302::2) 202.822 ms 202.751 ms 202.726 ms 
11 10gigabitethernet16-5.core1.lax2.he.net (2001:470:0:2a2::1) 198.292 ms 198.299 ms 198.289 ms 
12 2001:504:13::210:41 (2001:504:13::210:41) 202.082 ms 198.376 ms 198.366 ms 
13 2001:4860::1:0:6b02 (2001:4860::1:0:6b02) 199.266 ms 199.680 ms 199.664 ms 
14 2001:4860::8:0:7a1a (2001:4860::8:0:7a1a) 199.247 ms 199.209 ms 199.221 ms 
15 2001:4860::1:0:6302 (2001:4860::1:0:6302) 299.601 ms 341.907 ms 341.879 ms 
16 2001:4860::1:0:26ff (2001:4860::1:0:26ff) 326.027 ms 309.378 ms 304.353 ms 
17 * * * 
18 2001:4860:0:1::6e5 (2001:4860:0:1::6e5) 353.569 ms 355.450 ms 355.476 ms 
19 * 2404:6800:8000:21::2 (2404:6800:8000:21::2) 354.333 ms *

Code:

$ traceroute bt.neu6.edu.cn traceroute to bt.neu6.edu.cn 
(2001:da8:9000::232), 30 hops max, 80 byte packets 
1 2001:da8:1007:49a::2 (2001:da8:1007:49a::2) 1.477 ms 1.862 ms 2.259 ms 
2 2001:da8:1007:49a::1 (2001:da8:1007:49a::1) 0.613 ms 0.613 ms 1.013 ms 
3 * 2001:da8:1026:ffff::1 (2001:da8:1026:ffff::1) 1.421 ms 1.407 ms 
4 * * * 
5 2001:da8:1:504::1 (2001:da8:1:504::1) 1.805 ms 1.793 ms 1.790 ms 
6 2001:da8:1:28::1 (2001:da8:1:28::1) 11.877 ms 11.721 ms 11.704 ms 
7 bj-wh-v6.cernet2.net (2001:da8:1:1::1) 45.586 ms 45.321 ms 45.572 ms 
8 2001:da8:1:e::2 (2001:da8:1:e::2) 55.645 ms 55.480 ms 55.452 ms 
9 2001:da8:1:509::2 (2001:da8:1:509::2) 56.706 ms 56.275 ms 56.678 ms 
10 cernet2.net (2001:da8:a8:ffff::2) 55.752 ms 56.343 ms 55.915 ms 
11 neu6.edu.cn (2001:da8:9000:f001::2:2) 56.630 ms 56.923 ms 56.807 ms 12 * * * 
13 * * * 
14 * * * 
15 * * * 
16 * * * 
17 * * * 
18 * * * 
19 * * * 
20 * * * 
21 * * * 
22 * * * 
23 * * * 
24 * * * 
25 * * * 
26 * * * 
27 * * * 
28 * * * 
29 * * * 
30 * * *

Some other configuration and information are also attached:

Code:

$ ifconfig eth0
eth0      Link encap:Ethernet  HWaddr 00:25:22:de:5b:50  
          inet addr:114.212.203.128  Bcast:114.212.207.255  Mask:255.255.248.0
          inet6 addr: 2001:da8:1007:4001::16e9/128 Scope:Global
          inet6 addr: fe80::225:22ff:fede:5b50/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:463642901 errors:0 dropped:0 overruns:0 frame:0
          TX packets:661662967 errors:0 dropped:0 overruns:0 carrier:1
          collisions:0 txqueuelen:1000 
          RX bytes:117024472658 (117.0 GB)  TX bytes:671043574859 (671.0 GB)

Code:

$ cat /etc/network/interfaces
auto lo
iface lo inet loopback
iface lo inet6 loopback

Code:

$ ip -6 neigh 
fe80::9133:1836:dccd:4a16 dev eth0 lladdr ec:a8:6b:31:82:66 STALE
fe80::a436:17a9:36d8:c3dd dev eth0 lladdr 00:25:64:8a:63:0d STALE
fe80::218:8bff:fe7a:2476 dev eth0 lladdr 00:18:8b:7a:24:76 STALE
fe80::c44b:14e8:abf0:c49a dev vmnet8 lladdr 00:0c:29:ea:4a:b5 STALE
fe80::e81c:dff5:11bf:2ebb dev eth0 lladdr 44:37:e6:e8:0d:0b STALE
fe80::cabc:c8ff:fe93:c307 dev eth0 lladdr c8:bc:c8:93:c3:07 STALE
fe80::da49:bff:feb7:920 dev eth0 lladdr d8:49:0b:b7:09:20 router REACHABLE
fe80::225:64ff:fe8a:630d dev eth0 lladdr 00:25:64:8a:63:0d STALE

Code:

$ ip -6 route
2001:da8:1007:4001::16e9 dev eth0  proto kernel  metric 256 
fe80::/64 dev eth0  proto kernel  metric 256 
fe80::/64 dev vmnet1  proto kernel  metric 256 
fe80::/64 dev vmnet8  proto kernel  metric 256 
fe80::/64 dev pan1  proto kernel  metric 256 
default via fe80::da49:bff:feb7:920 dev eth0  proto static  metric 1 
default via fe80::da49:bff:feb7:920 dev eth0  proto ra  metric 1024  expires 1265sec

nini09 · 12-03-2014, 02:48 PM

The number of hop is bigger for http://bt.neu6.edu.cn/. You can increase hop limit for IPv6.
In general, it is under /proc/sys/net/ipv6/. Maybe deeping to subdirectory dependent on distribution.

superweijiafeng · 12-03-2014, 06:09 PM

I tried to change the max hopes to 60 and 100

Code:

traceroute bt.neu6.edu.cn -m 60

and

Code:

traceroute bt.neu6.edu.cn -m 100

It doesn't help, like the result of maxhope=30.

On windows the result is:

Code:

C:\Users\lei>tracert -6 bt.neu6.edu.cn

  1     1 ms    18 ms     2 ms  2001:da8:1007:49a::2
  2    <1 ms   <1  ms   <1  ms  2001:da8:1007:49a::1
  3     *        *        *     timeout
  4     2 ms     2 ms     2 ms  cernet2.net [2001:da8:a3:a002::1]
  5     *        *        *     timeout
  6    11 ms    11 ms    11 ms  2001:da8:1:26::1
  7     *        *        *     timeout
  8     *        *        *     timeout
  9    41 ms    42 ms    41 ms  2001:da8:1:509::2
 10     *        *        *     timeout
 11    41 ms    41 ms    41 ms  neu6.edu.cn [2001:da8:9000:f001::2:2]
 12    41 ms    41 ms    41 ms  neu6.edu.cn [2001:da8:9000:f003::9:2]
 13    40 ms    40 ms    40 ms  bt.neu6.edu.cn [2001:da8:9000::232]

I dont know why the neu6.edu.cn doesn't redirect me to the bt.neu6.edu.cn.

nini09 · 12-04-2014, 03:03 PM

Are both Windows and Linux machine in same network, same source IPv6 network address?

superweijiafeng · 12-04-2014, 06:06 PM

One thing for sure is that they connect to the same switchboard, and the switchboard is connected to the campus network.

Does that mean they are in same network, same source IPv6 network address?

superweijiafeng · 12-08-2014, 02:25 AM

The problem is strange and I solved it in a strange way.

I managed to get several new ipv6 addresses. It seems that some addresses are "good" which can access both the websites, and others are "bad". BTW, I didn't change any settings except the ipv6 address.

Thanks nini09 for kind help.

nini09 · 12-08-2014, 02:28 PM

The website is sensitive source IPv6 address.