Strange IPv6 reachability problem

[Seth Mattinen]

On 6/19/2011 3:38 PM, Jeroen Massar wrote:
> On 2011-06-20 00:19 , Seth Mattinen wrote:
> [..]
>> I *can not* reach it from a server at my parent's house:
>>
>> source: 2607:fe70:1002:0:202:b3ff:fe30:f633
>> dest: 2001:500:61:28::70
>>
>> PING 2001:500:61:28::70(2001:500:61:28::70) 56 data bytes
>
> I suggest you try this magical tool called 'traceroute' or if available
> tracepath6 it will open your eyes.

What did I do to warrant such a rude response from you?


>
> As you can see one of the boxes close to it does not know what to do
> with it.
>
> [..]
>> nfdump filter:
>> proto icmp6 and host 2001:500:61:28::70
>
> Where on the network are you getting netflow from and why not just
> tcpdump which can give you per packet details, avoiding any issues that
> might be on the netflow level.

There are no issues with my netflow, and if it's not crossing my border 
in to me then obviously tcpdump on the interface is even less useful. 
Plus I can reach plenty of other IPv6 addresses from this box, like 
ipv6.google.com. Here's 2001:4860:4001:803::1012:


PING 2001:4860:4001:803::1012(2001:4860:4001:803::1012) 56 data bytes
64 bytes from 2001:4860:4001:803::1012: icmp_seq=1 ttl=54 time=31.1 ms
64 bytes from 2001:4860:4001:803::1012: icmp_seq=2 ttl=54 time=26.3 ms
64 bytes from 2001:4860:4001:803::1012: icmp_seq=3 ttl=54 time=26.7 ms
64 bytes from 2001:4860:4001:803::1012: icmp_seq=4 ttl=54 time=26.3 ms
64 bytes from 2001:4860:4001:803::1012: icmp_seq=5 ttl=54 time=26.9 ms

--- 2001:4860:4001:803::1012 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4018ms
rtt min/avg/max/mdev = 26.345/27.509/31.196/1.856 ms



nfdump filter:
proto icmp6 and host 2001:4860:4001:803::1012
Aggregated flows 2
Top 500 flows ordered by flows:
Date flow start          Duration  Proto      Src IP Addr      Dst IP 
Addr   Packets    Bytes      bps    Bpp Flows
2011-06-19 15:56:14.704     4.016  ICMP6 2001:48..3::1012 
2607:fe..30:f633         5      520     1035    104     1
2011-06-19 15:56:15.176     4.020  ICMP6 2607:fe..30:f633 
2001:48..3::1012         5      520     1034    104     1

Summary: total flows: 2, total bytes: 1040, total packets: 10, avg bps: 
1852, avg pps: 2, avg bpp: 104
Time window: 2011-06-19 15:56:14 - 2011-06-19 15:56:19
Total flows processed: 311131, Blocks skipped: 0, Bytes read: 22607736
Sys: 0.268s flows/second: 1160867.3  Wall: 0.262s flows/second: 1186033.6

5 out and 5 in, as expected. And traceroute:

traceroute to 2001:4860:4001:803::1012 (2001:4860:4001:803::1012), 30 
hops max, 40 byte packets
  1  2607:fe70:1002::1  0.345 ms  0.362 ms  0.438 ms
  2  2607:fe70:1001::1  9.133 ms  9.210 ms  9.852 ms
  3  2607:fe70::14:1  10.605 ms  10.598 ms  15.037 ms
  4  2607:fe70::5:2  15.031 ms  15.447 ms  15.440 ms
  5  2607:fe70::a:1  19.616 ms  19.610 ms  20.214 ms
  6  2607:fe70::4:1  21.113 ms  20.611 ms  20.616 ms
  7  2600:6:300::6  27.549 ms * *
  8  2600:0:2:1239:144:232:6:63  20.025 ms  19.226 ms  19.210 ms
  9  2600:0:2:1239:144:232:20:181  17.281 ms 
2600:0:2:1239:144:232:18:150  19.438 ms 2600:0:2:1239:144:232:24:32 
18.942 ms
10  2600:0:2:1239:144:232:8:151  18.943 ms  19.783 ms  19.686 ms
11  2600:0:3:1239:144:232:25:121  25.036 ms  24.055 ms  24.996 ms
12  2001:4860::1:0:21  24.987 ms  26.565 ms  24.901 ms
13  2001:4860:0:1::1b7  28.549 ms  28.442 ms  29.581 ms
14  2001:4860:8000:10:92e6:baff:fe53:b1a0  27.775 ms 
2001:4860:8000:10:92e6:baff:fe53:9f0c  27.709 ms 
2001:4860:8000:10:92e6:baff:fe53:9ece  27.668 ms

So it works. However, the address I stated in my original email still 
does not.

~Seth