IPv6 big packet blackhole in Teleglobe/TATA backbone?

[Ross West]

> I and Remi have been trying to figure out an IPv6 big packet blackhole
> that seems to be occurring in Teleglobe network, specifically around 
> IP addresses 2001:5a0:200::5 and 2001:5a0:200::10.  I suspect MTU is 
> not properly configured.

I'm a Tata customer, and here's what I see:

-=
[westr at faraday ~]$ traceroute6 -v www.remlab.net
traceroute6 to poy.remlab.net (2001:41d0:1:a0d6::401:1983) from 2610:38::2, 64 hops max, 12 byte packets
 1  2610:38::1 68 bytes of data to 2610:38::2  0.490 ms  0.304 ms  0.293 ms
 2  tunnel13.6bb1.nyy-newyork.ipv6.teleglobe.net 68 bytes of data to 2610:38::2  20.039 ms  19.984 ms  19.725 ms
 3  2001:5a0:400:300::1 68 bytes of data to 2610:38::2  19.995 ms  19.903 ms  19.934 ms
 4  2001:5a0:0:300::2d 68 bytes of data to 2610:38::2  96.759 ms  97.458 ms  96.809 ms
 5  2001:5a0:1900::d 68 bytes of data to 2610:38::2  96.947 ms  97.003 ms  96.882 ms
 6  2001:5a0:1900::a 68 bytes of data to 2610:38::2  97.347 ms  97.042 ms  97.104 ms
 7  2001:41d0::591 68 bytes of data to 2610:38::2  100.780 ms
157 bytes from 2001:41d0:1:4a86::1 to 2610:38::2: icmp type 1 (Destination Unreachable) code 4
0000: 60000000 006d1139 26100038 00000000
0010: 00000000 00000002 200141d0 00014a86
0020: 00000000 00000001 c0000035 006d1c87
0030: b4580000 00010000 00000001 01310139
0040: 01350130 01300130 01300130 01300130
0050: 01300130 01300130 01300130 01300130
0060: 01300130 01300130 01300130 01300164
0070: 01310134 01310130 01300132 03697036
0080: 04617270 6100000c 00010000 29100000
0090: 00800000 00000000 00000000 00
  100.811 ms  101.340 ms
 8  2001:41d0:1:a0d6::401:1983 68 bytes of data to 2610:38::2  101.103 ms  100.715 ms  100.754 ms
-=

Not sure if hop #7 output helps - here's what I normally get:

-=





-- 
 Ross West - doin' ipv6 in Canada.