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405 posts

Ultimate Geek
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Topic # 201521 22-Aug-2016 12:12
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Hi all. For the past... 4? weeks now, all IPv6 connections time out for me. Multiple computers, Windows and Linux, Fritzbox 7490 or Asus routers, ethernet and wifi. Factory reset the fritzbox too. I get an IP fine, routes look fine, everything seems okay but no connections to IPv6 destinations work. No, it's not a DNS issue.

 

 

 

I'm hoping the wisdom of the crowds might be able to help me here. Here's the email I sent to 2degrees support a week ago (they haven't responded yet, funnily enough. It seemed like the tier2 support on the phone wanted to fob me of too...)

 

 

 

 

For the last week or two, all IPv6 connections time out on my

 

connection. There is no error message when pinging, packets silently

 

drop. SSHing to my IPv6 enabled VPS would take two minutes to connect,

 

because it was trying to connect over IPv6 and receiving no reply,

 

before giving up and connecting instantly over IPv4.

 

 

I test IPv6 using my VPS, google.com and ipv6-test.com.

 

 

This is not a DNS problem, DNS was returning both IPv4 and v6 addresses

 

correctly.

 

 

This didn't actually break dual stack websites, so please don't ask me

 

to turn off IPv6 again.

 

 

I can make IPv6 connections inside my local network, for instance to my

 

fritz box.

 

 

I have tried to make connections on two different computers, one windows

 

10 and one linux. Both failed in the same way.

 

 

I have tried two routers, the 7490 and an ASUS RT-AC66U, with no change.

 

I also tried factory-resetting the fritzbox, no change.

 

 

Ethernet and Wifi, no change.

 

 

I have had extensive phone session with both Tier 1 and 2 support at

 

2degrees, niether were able to find the problem.

 

 

As I have replaced every component of my network locally with no change

 

to the problem, I can only conclude that there is some kind of

 

server-side issue at 2degrees.

 

 

Here is some sample console output:

 

 

$ ping6 google.com

 

PING google.com (2404:6800:4006:802::200e): 56 data bytes

 

 

--- google.com ping statistics ---

 

6 packets transmitted, 0 packets received, 100% packet loss

 

 

--------------------------------------------------------

 

 

# ping6 2404:6800:4006:802::200e

 

PING 2404:6800:4006:802::200e (2404:6800:4006:802::200e): 56 data bytes

 

 

--- 2404:6800:4006:802::200e ping statistics ---

 

10 packets transmitted, 0 packets received, 100% packet loss

 

 

--------------------------------------------------------

 

 

# traceroute6 google.com

 

traceroute to google.com (2404:6800:4006:802::200e), 30 hops max, 16

 

byte packets

 

1 * * *

 

2 * * *

 

3 * * *

 

4 * * *

 

5 * * *

 

6 * * *

 

7 * * *

 

8

 

 

etc etc.

 




I'll add my IP settings:

2: enp5s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether d0:50:99:2f:31:90 brd ff:ff:ff:ff:ff:ff
inet 192.168.178.25/24 brd 192.168.178.255 scope global dynamic enp5s0
valid_lft 817025sec preferred_lft 817025sec
inet6 2406:e001:2d22:1:9ab:2c7b:e187:c540/64 scope global noprefixroute dynamic
valid_lft 6971sec preferred_lft 3371sec
inet6 fd00::457b:543f:7e8f:a41/64 scope global deprecated noprefixroute dynamic
valid_lft 6971sec preferred_lft 0sec
inet6 fe80::8c5d:4dc1:b8f8:d1c9/64 scope link
valid_lft forever preferred_lft forever


Any ideas are very much appreciated!


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1525 posts

Uber Geek
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2degrees

  Reply # 1615713 22-Aug-2016 12:31
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Hey Ripdog,

 

Something certainly looks odd there. Can you please message us your broadband customer number or username, we'll check it out for you.

 

Thanks,

 

Ralph ^JOB


918 posts

Ultimate Geek
+1 received by user: 279

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  Reply # 1615724 22-Aug-2016 12:50
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IpV6 is a bit different to v4. Generally your router will run a v6 DHCP server, and issues IP's out of a ::/56 or sometimes a ::/48 range.

 

So it could be a problem with your router. The ISP Doesn't give you a single IP address, they give you a range for your network.








405 posts

Ultimate Geek
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  Reply # 1615742 22-Aug-2016 13:01
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 PM sent @2degreescare.

 

 

 

@darylblake IP settings are fine. All settings are at defaults, and the fritzbox was factory reset. 2degrees offers fully supported v6, and that includes a preconfigured router. Both windows and linux PCs are at default IPv6 settings. The IP I get is valid, and if it wasn't, connections would fail outright rather than time out.


796 posts

Ultimate Geek
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  Reply # 1615751 22-Aug-2016 13:13
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This sounds similar to the trouble I was having a week or so ago. Router would obtain a prefix, but neither the router or client devices could ping anything except the first 2degrees HOP. Thankfully for me it came right (seemingly) on its own.

 

I submitted a ticket, it came right, and support replied to me a few days later, to which I replied querying what happened. I haven't dared reboot the router, and am still waiting for a response from the support team on what's happening.

 

I have a suspicion something has changed, as I've previously had very reliable service, both v4 and v6.

 

My line connects through the Snap-37 BNG FWIW.


109 posts

Master Geek
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  Reply # 1615809 22-Aug-2016 14:27
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Sorry to go slightly off topic but @2degreescare i have also sent you a PM regarding an issue i am having would appreciate any light you can shed on the situation.




405 posts

Ultimate Geek
+1 received by user: 209

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  Reply # 1616470 23-Aug-2016 18:07
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All sorted, some kind of backend issue. Thanks @2degreescare!


1525 posts

Uber Geek
+1 received by user: 268

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2degrees

  Reply # 1616726 24-Aug-2016 10:55
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No worries at all, glad to help :)

 

Ralph ^JOB


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