request for help in finding a blackhole

[Drake Wilson]

Quoth "Frank Bulk - iName.com" <frnkblk at iname.com>, on 2010-05-04 13:11:22 -0500:
> What does mturoute show?

After receiving clarifications (thanks), installed tracepath6.
tracepath6 www.mur.at from drache.begriffli.ch:

 1?: [LOCALHOST]                      pmtu 1500
 1:  zwischenschaltung.begriffli.ch             0.946ms
 1:  zwischenschaltung.begriffli.ch             0.999ms
 2:  zwischenschaltung.begriffli.ch             0.929ms pmtu 1472
 2:  begrifflich.tunnel.tserv8.dal1.ipv6.he.net  44.573ms
 2:  begrifflich.tunnel.tserv8.dal1.ipv6.he.net  44.608ms
 3:  gige-g2-14.core1.dal1.ipv6.he.net         43.319ms
 4:  10gigabitethernet1-4.core1.chi1.he.net    70.560ms
 5:  ibx-chi.ip6.tiscali.net                   69.641ms asymm  6
 6:  xe-2-1-0.nyc20.ip6.tinet.net              87.755ms asymm  8
 7:  xe-5-2-0.lon11.ip6.tinet.net             212.686ms asymm  9
 8:  xe-9-2-0.lon10.ip6.tinet.net             165.985ms
[... "no reply" thereafter]

Using the -l option to set initial packet size and doing a
quasi-binary search yields the same results down to -l 1450, at
which point more hops come into view:
 
 9:  no reply
10:  no reply
11:  Aconet.tu-637.sar1.Amsterdam1.Level3.net 233.160ms asymm 12
12:  2001:628::a089:0:1                       239.639ms asymm 13
[... "no reply" thereafter]

which matches the earlier ICMPv6 echo traceroute up to the last hop
before the final destination.

Does this suggest an MTU breakage near that point?

   ---> Drake Wilson