www.java.com

[#1]

Might be worth running an IPv6 traceroute and see if there is a routing issue that affects PlusNet IPv6 but not Hurricane Elect.
I get :

# traceroute6 -I www.java.com
traceroute to www.java.com (2a02:26f0:5a:281::1ba3), 30 hops max, 80 byte packets
 1  bubbles.thehobsons.co.uk (2001:470:1f09:baa::1)  1.444 ms  1.426 ms  1.406 ms
 2  SimonH-1.tunnel.tserv5.lon1.ipv6.he.net (2001:470:1f08:baa::1)  23.582 ms  26.732 ms  29.444 ms
 3  v316.core1.lon1.he.net (2001:470:0:67::1)  31.150 ms  31.179 ms  31.171 ms
 4  10ge3-1.core1.lon2.he.net (2001:470:0:2cd::1)  31.128 ms  31.114 ms  31.090 ms
 5  ge-2-1-0-zpr1.lnt.cw.net (2001:7f8:4::4f9:1)  31.028 ms  31.002 ms  30.983 ms
 6  so-0-1-0-r1-IPv6.de.cw.net (2001:5000:0:1::1)  30.981 ms  27.924 ms  27.644 ms
 7  akamai-gw2.lns.cw.net (2001:5000:1100:9::2)  27.704 ms  24.903 ms  24.836 ms
 8  2a02:26f0:5a:281::1ba3 (2a02:26f0:5a:281::1ba3)  23.967 ms  21.118 ms  21.073 ms

[#2]

Not working:

Quote from: AndyH

Connecting to www.java.com (www.java.com)|2a02:26f0:5a:282::1ba3|:80...

Working:

Quote from: MJN

Connecting to www.java.com (www.java.com)|2a02:26f0:5a:281::1ba3|:80... connected.

Significant?

[#3]

Quote from: jelv

Significant?

Quite possibly.
It looks like Java.com is on Akamai's delivery network, and that will use various techniques to spread load/connect users to a "near" node. it could be that not all their nodes are OK.

[#4]

I've tried both v6 addresses and neither work for me.

Quote

~ Andrew$ traceroute6 www.java.com traceroute6: Warning: e7075.dscx.akamaiedge.net has multiple addresses; using 2a02:26f0:5a:281::1ba3 traceroute6 to e7075.dscx.akamaiedge.net (2a02:26f0:5a:281::1ba3) from 2a02:16c8:2000:1100:2d05:1f12:xxxx:xxxx, 64 hops max, 12 byte packets 1  2a02:16c8:2000:1100:5246:5dff:xxxx:xxxx  0.400 ms  0.388 ms  0.328 ms 2  2a02:16c8:0:1::1a  4.664 ms  4.988 ms  6.161 ms 3  2a02:16c8:1:2::13  4.638 ms  4.694 ms  4.190 ms 4  2a02:16c8::b  4.393 ms  4.400 ms  4.315 ms 5  * *     lonap.he.net  14.801 ms 6  10ge3-1.core1.lon2.he.net  4.498 ms  9.128 ms  4.502 ms 7  ge-2-1-0-zpr1.lnt.cw.net  4.627 ms  4.494 ms  4.564 ms 8  so-0-1-0-r1-ipv6.de.cw.net  4.947 ms  5.056 ms  4.846 ms 9  akamai-gw2.lns.cw.net  5.280 ms  5.314 ms  5.793 ms 10  * * * 11  * * *

Also tried different gateways, and no difference.

[#5]

Try it with the "-I" option - that uses ICMP Ping rather than random UDP ports. I find it's quite common that UDP traceroute fails to find the final device because it just drops packets to services it isn't hosting (most of my systems do that) and so you just get rows of asterisks. It's less common to block pings.

[#6]

On my HE tunnel, I get similar to 'SimonHobson'

$ mtr -6 -r -c 10 www.java.com
HOST: My-laptop                   Loss%   Snt   Last   Avg  Best  Wrst StDev
  1. 2001:470:xxxx:xxx::           0.0%    10    3.8   4.3   3.8   6.8   1.1
  2. purleigh-1.tunnel.tserv5.lon  0.0%    10   36.5  37.1  36.3  39.5   0.9
  3. v316.core1.lon1.he.net        0.0%    10   33.5  35.7  32.3  42.5   3.3
  4. 10ge3-1.core1.lon2.he.net     0.0%    10   34.9  38.8  34.9  42.3   2.5
  5. ge-2-1-0-zpr1.lnt.cw.net      0.0%    10   34.3  36.0  32.3  46.4   4.4
  6. so-0-1-0-r1-IPv6.de.cw.net    0.0%    10   33.2  34.1  32.7  38.7   1.8
  7. akamai-gw2.lns.cw.net         0.0%    10   33.2  34.0  33.2  35.3   0.6
  8. 2a02:26f0:5a:281::1ba3        0.0%    10   32.9  33.1  32.7  34.0   0.4

[#7]

Hmm...how weird is this. I see what the problem is.
I've made no changes my end - but I am unable to access a lot of IPv6 sites again.
Looking at my router log, I am getting a lot of errors all of a sudden:

Quote

Apr 22 11:48:59 rc_service: dhcp6c-state 2129:notify_rc start_radvd Apr 22 11:48:59 rc_service: dhcp6c-state 2129:notify_rc start_httpd Apr 22 11:48:59 rc_service: waitting "start_radvd" via dhcp6c-state ... Apr 22 11:48:59 radvd[2127]: Exiting, sigterm or sigint received. Apr 22 11:49:00 RT-N66U: start httpd

[#8]

Well I have fixed the IPv6 problem (I think) - it seems like something to do with the DHCP6 lease expiring.
I had to disable/enable IPv6 on my router again. I will pester Asus again to let them know.
The traceroute still fails:

Quote

~ Andrew$ traceroute6 -I www.java.com traceroute6: Warning: e7075.dscx.akamaiedge.net has multiple addresses; using 2a02:26f0:5a:281::1ba3 traceroute6 to e7075.dscx.akamaiedge.net (2a02:26f0:5a:281::1ba3) from 2a02:16c8:2000:1100:b820:6427:xxxx:xxxx 64 hops max, 16 byte packets 1  2a02:16c8:2000:1100:5246:5dff:xxxx:xxxx  0.437 ms  0.376 ms  0.324 ms 2  2a02:16c8:0:1::19  5.397 ms  5.075 ms  5.053 ms 3  2a02:16c8:1:2::11  4.821 ms  4.390 ms  4.297 ms 4  2a02:16c8::a  4.619 ms  4.647 ms  4.375 ms 5  2a02:16c8:1:2::3  7.136 ms  4.401 ms  4.222 ms 6  * * * 7  * * * 8  * * *

[#9]

Quote from: purleigh

Although interestingly if I use http://java.com my browser defaults to IPv4, but http://www.java.com uses IPv6.

That would be because java.com does not have an IPv6 address!

[#10]

@jelv - Can you access www.java.com over IPv6 with either of those two addresses?

[#11]

Interesting find:
Using the office DNS server (allocated by the VPN) I'm getting different IP addresses!

Non-authoritative answer:
Name:    e7075.dscx.akamaiedge.net
Addresses:  2a02:26f0:26:3:8e00::1ba3
          2a02:26f0:26:3:9d00::1ba3
          2a02:26f0:26:3:8200::1ba3
          95.100.150.140
Aliases:  www.java.com
          www.java.com.edgekey.net

[#12]

Neither of the one's allocated by the PN servers work, but all of the IPs allocated by the VPN DNS server work.
(I forced it by putting the IPs in the hosts file)

[#13]

Another interesting thing: the PN DNS servers are giving different IPv4 addresses.

[#14]

What are the PN default v6 DNS addresses?
I tried Google's v6 DNS servers and they gave the same addresses as OpenDNS v6 DNS servers (which I use).

[#15]

The PN IPv4 DNS servers also give IPv6 results.

Quote from: dave

Your accounts will have a single static IPv4 and a /56 Ipv6. Our DNS platform has yet to be upgraded to IPv6 so you will be assigned Hurricane Electric's DNS servers when you connect.