isc.org unreachability (Re: Test your connectivity for World IPv6 Day)

[Jeroen Massar]

[Bcc to folks @ ISC so that they are aware of this thread, peek into it
and most very likely also resolve it]

On 2011-Jun-06 16:13, Gert Doering wrote:
> Hi,
> 
> On Mon, Jun 06, 2011 at 12:50:13PM +0000, Bjoern A. Zeeb wrote:
>> ISC looks like an IO issue given the socket opens and GET / then hangs.
>> Given them another hour or two to wake up;-)
> 
> Now that would be typical behaviour for PMTU problems...
> 
> OTOH, www.isc.org works from my home link which has an IPv6 MTU of 
> 1400 bytes, so it's not exactly "typical"...

Seems something is dropping ICMP and thus most very likely also
PacketTooBig...:

jeroen at noc:~$ tracepath6 www.isc.org
 1?: [LOCALHOST]                        0.011ms pmtu 1500
 1:  ge-1-3-0.breda.ipv6.concepts-ict.net                  0.921ms asymm  2
 1:  ge-1-3-0.breda.ipv6.concepts-ict.net                  0.833ms asymm  2
 2:  gi2-11.nikhef.ipv6.concepts-ict.net                   2.160ms
 3:  ge-0.ams-ix.amstnl02.nl.bb.gin.ntt.net                3.011ms asymm  4
 4:  as-2.r23.amstnl02.nl.bb.gin.ntt.net                   3.656ms asymm  5
 5:  ae-7.r21.asbnva02.us.bb.gin.ntt.net                  96.520ms asymm  6
 6:  ae-4.r20.snjsca04.us.bb.gin.ntt.net                 166.863ms asymm  7
 7:  ae-1.r21.plalca01.us.bb.gin.ntt.net                 173.251ms asymm  8
 8:  po-2.r03.plalca01.us.bb.gin.ntt.net                 173.367ms
 9:  ge-1-11.r03.plalca01.us.ce.gin.ntt.net              165.910ms asymm 12
10:  no reply
[..]

rest of it using traceroute6:
 9  ge-1-11.r03.plalca01.us.ce.gin.ntt.net (2001:418:1c00:5000::a)
164.283 ms  164.295 ms  164.110 ms
10  www.isc.org (2001:4f8:0:2::d)  161.762 ms  162.015 ms  161.910 ms
j

jeroen at bliss:~$ tracepath6 www.isc.org
 1?: [LOCALHOST]                        0.042ms pmtu 1500
 1:  eternity.ch.unfix.org                                 0.093ms
 1:  eternity.ch.unfix.org                                 0.106ms
 2:  eternity.ch.unfix.org                                 0.093ms pmtu 1420
 2:  ipman.zrh.sixxs.net                                  28.394ms asymm  3
 3:  ge0-3.br01.zrh254.ipv6.ip-man.net                    27.533ms asymm  4
 4:  10gigabitethernet1-2.core1.zrh1.he.net               28.190ms asymm  5
 5:  10gigabitethernet3-2.core1.fra1.he.net               34.224ms asymm  6
 6:  10gigabitethernet5-3.core1.lon1.he.net               62.304ms asymm  9
 7:  10gigabitethernet7-4.core1.nyc4.he.net              126.933ms asymm 10
 8:  10gigabitethernet8-3.core1.chi1.he.net              139.418ms asymm 11
 9:  2001:470:1:34::2                                    193.169ms asymm 15
10:  iana.r1.ord1.isc.org                                214.928ms asymm 14
11:  int-0-0-1-8.r1.pao1.isc.org                         193.741ms asymm 13
12:  no reply
13:  no reply
[..]

rest of that using traceroute6:
11  int-0-0-1-8.r1.pao1.isc.org (2001:4f8:0:1::4a:1)  189.704 ms
186.101 ms  186.218 ms
12  www.isc.org (2001:4f8:0:2::d)  185.852 ms  196.457 ms  190.334 ms

Somebody needs to fix those ICMP filters ;)

Greets,
 Jeroen