IPv6 Account Problem

[#1]

Quote from: AndyH

If I try from a browser, I also get a lot more SYN/ACK packets - but I also get duplicates and retransmitted packets. http://ipv6labs.cyberis.co.uk/logo.png should be a good one to try because it's a single HTTP request. There's also http://ipv4labs.cyberis.co.uk/logo.png to compare IPv4 vs IPv6. This problem has totally baffled me   We know my trial account should be fine - another trialist has tested it and had no problems. I tried his trial account and the problem still occurred. I would put money on this being down to whatever BT TSO did Thursday morning (I am going to try and prove this tomorrow). The fact that I tried a router firmware upgrade has to be coincidental as I've tried a different router that has never been used before. This is indeed a lesson of leave it alone or it will break

AndyH if the tbb speedtest works can you run it on my account?
that logo.png works for me.

[#2]

I can't access TBB over IPv6

[#3]

www.thinkbroadband.com is working for me.
C:\Users\admin>tracert -6 www.thinkbroadband.com
Tracing route to www.thinkbroadband.com [2a02:68:1::4]
over a maximum of 30 hops:
  1    2 ms    <1 ms    <1 ms  dsldevice.lan [2a02:16c8:8400:6a00:5a98:35ff:fe22:51aa]
  2    8 ms    9 ms    8 ms  2a02:16c8:0:1::1:10
  3    8 ms    8 ms    8 ms  2a02:16c8:1:8110::1
  4    12 ms    8 ms    15 ms  40ge1-3.core1.lon2.he.net [2001:7f8:4::1b1b:1]
  5    8 ms    8 ms    8 ms  linx-gw1.thn.ncuk.net [2001:7f8:4::5394:1]
  6    11 ms    11 ms    10 ms  gi1-0-24-10-star1.core-rs2.thdo.ncuk.net [2a02:68:0:1::9]
  7    8 ms    8 ms    8 ms  www.thinkbroadband.com [2a02:68:1::4]
Trace complete.

[#4]

andyh assuming you using vista or newer windows, run this command and paste output.
netsh interface ipv6 show global
if random identifiers is enabled try this.
disconnect ipv6, either by disabling your network card, or disabling it in configuration.
run
netsh interface ipv6 set global randomizeidentifiers=disabled
recconect ipv6
you can revert easily by running netsh interface ipv6 set global randomizeidentifiers=enabled
is your entire lan affected or just one machine?

[#5]

Quote from: PeteB

www.thinkbroadband.com is working for me. C:\Users\admin>tracert -6 www.thinkbroadband.com Tracing route to www.thinkbroadband.com [2a02:68:1::4] over a maximum of 30 hops:   1     2 ms    <1 ms    <1 ms  dsldevice.lan [2a02:16c8:8400:6a00:5a98:35ff:fe22:51aa]   2     8 ms     9 ms     8 ms  2a02:16c8:0:1::1:10   3     8 ms     8 ms     8 ms  2a02:16c8:1:8110::1   4    12 ms     8 ms    15 ms  40ge1-3.core1.lon2.he.net [2001:7f8:4::1b1b:1]   5     8 ms     8 ms     8 ms  linx-gw1.thn.ncuk.net [2001:7f8:4::5394:1]   6    11 ms    11 ms    10 ms  gi1-0-24-10-star1.core-rs2.thdo.ncuk.net [2a02:68:0:1::9]   7     8 ms     8 ms     8 ms  www.thinkbroadband.com [2a02:68:1::4] Trace complete.

pete you mind doing a speedtest? see here for why I am asking.
http://community.plus.net/forum/index.php/topic,125357.msg1091135.html#msg1091135

[#6]

See other post for speed test results.

[#7]

Quote from: chrcoluk

is your entire lan affected or just one machine?

Entire LAN - 2 iMacs, 2 Macbooks, 3 PCs, 1 laptop, 4 iPhones and 2 iPads (even a laptop that I borrowed from a neighbour had the same problem).
I am confident there are no issues my end.
Ok...so playing around with that Cyberis site (http://ipv4labs.cyberis.co.uk/logo.png and http://ipv6labs.cyberis.co.uk/logo.png), these are the IPv4 and IPv6 wireshark flow charts for the TCP traffic:
IPv4 (working fine - no problems):

IPv6 (not working):

- The initial handshakes (SYN, SYN-ACK, ACK) look fine in both charts
- The IPv6 traffic is missing the 173 byte data packet (the logo image) - question is where is the packet being blocked and why?

[#8]

Andy, could you send me the Wireshark please, I'll PM my email address.

[#9]

Andy, what's your IPv6 interface MTU set to on the 582?

[#10]

Hi Kelly
Ok I am making progress here...
Originally, I was changing the MTU on the TG582N router (defaults are 1500 on LAN/WAN). Setting the LAN to 1400 and the WAN to 1492 - this made no difference. I don't believe you can set different MTUs for the v4 and v6.
I've now changed the MTU on my Mac to 1492 (default is 1500) on the Ethernet card and hey presto everything works (I didn't realise I had to refresh the DHCP at first)!  
There are some things that I need to have a look at here...
- Why I was able to use IPv6 fine for a couple of months trouble free with my Asus and the default settings (which I believe is MTU 1492 for v4/v6 WAN and 1500 LAN)? The Mac/Windows machines have always been set to the default MTUs of 1500 and worked fine.
- iPhones/iPads you can''t set the MTU so this is a problem and they still will not work
- Has no one else on the trial with fibre used the default TG582N MTU settings and had problems?
Speeds are fine over single thread and x6 -

Edit: Also, did you make some changes your end? **Ignore the TBB Ping Monitor comment - seems like it was an issue their end!**
@ chrcoluk Are you sure you have the right graphs for your v4/v6 traffic? It looks like they are the wrong way around...

[#11]

Quote from: AndyH

- iPhones/iPads you can''t set the MTU so this is a problem and they still will not work - Has no one else on the trial with fibre used the default TG582N MTU settings and had problems?

Hi Andy
Did you run the command I posted in a previous reply?
One of our guys has a 582 on FTTC and running below sets the v6 router advertisements to effectively sent an MTU of 1492 to all devices.  I'm running a Cisco box at home but the principal is the same just a different command.

:ip rt6advd ifdetach intf LocalNetwork
:ip rt6advd ifconfig intf=LocalNetwork linkmtu=1492
:ip rt6advd ifattach intf LocalNetwork
:saveall
=>ip rt6advd iflist
Flags Legend: ttached anaged ther - Def. Rtr. Pref. ow / Medim / igh
Interface        AdvInterval Lifetime Reachabl...

[#12]

Hi Paul
Thanks, that's fixed it!
It wouldn't allow me to set a MTU of anything >1400 for some reason (running f/w version 10.2.5.2.FO), so I've just set it to 1400.
I am assuming that's going to have been the same problem with the Asus f/w - so I will play around with that this evening to see.

[#13]

andy my graphs are the right way round.
remember both are the same connection, just different protocols.
so eg. if I am saturating my connection I would expect both graphs to react the same way, they are not seperate internet connections but rather seperate routes out to the internet.
right now tho my main issue is the 3mbit/sec throughput issue which seems to be caused by tcp windows not growing much above a few k in size.