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Standard User GonePostal
(committed) Tue 27-Oct-20 14:00:22
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IPv6 problem


[link to this post]
 
Current situation is IDNet FTTC connection, Billion 8800AXL r2 modem.router, Dell Inspiron laptop with Qualcomm QCA9377 802.11ac Wireless Adapter. All drivers are up to date. IPv6 configuration is enabled in the LAN page of the router GUI and in the configuration tab for the Adapter.

The router has IPv6 connectivity which seems to be permanent as the BQM for the IPv6 connection shows no packet loss or latency issues. When the laptop is connected there is an IPv6 link to the router. After a random interval the IPv6 link drops and trying to visit test sites like http://v6.testmyipv6.com/ shows the site as unreachable. Dropping and re-connecting the internal LAN link by disabling and re-enabling the WiFi or going into aeroplane mode then cancelling restores the IPv6 link for a random time after which it drops again.

If I disable the Qualcomm Adapter and use a Realtek WiFi dongle the IPv6 connection does not drop. None of the above interferes with the IPv4 connection which is maintained for both WAN and LAN. We have a second identical Inspiron in the house and it shows the same behaviour.

That seems to indicate to me that there is some problem with the configuration of the Qualcomm Adapter although I do not have any significant expertise in this sort of area so may be wrong. Has anyone any idea what might be causing the problem and what steps I might take to address it?
Administrator MrSaffron
(staff) Tue 27-Oct-20 19:59:35
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Re: IPv6 problem


[re: GonePostal] [link to this post]
 
Have you checked for any driver updates for the network card.

The author of the above post is a thinkbroadband staff member. It may not constitute an official statement on behalf of thinkbroadband.
Standard User GonePostal
(committed) Tue 27-Oct-20 23:14:27
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Re: IPv6 problem


[re: MrSaffron] [link to this post]
 
In reply to a post by MrSaffron:
Have you checked for any driver updates for the network card.


According to the Dell Support Assist app all drivers are up to date.

Edited by GonePostal (Tue 27-Oct-20 23:15:01)


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Standard User danielhyde
(member) Wed 28-Oct-20 10:27:38
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Re: IPv6 problem


[re: GonePostal] [link to this post]
 
In reply to a post by GonePostal:
In reply to a post by MrSaffron:
Have you checked for any driver updates for the network card.


According to the Dell Support Assist app all drivers are up to date.


Dell don't always have the latest drivers, it's always best to check the manufacturer of the specific parts website.
Standard User GonePostal
(committed) Wed 28-Oct-20 11:50:54
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Re: IPv6 problem


[re: danielhyde] [link to this post]
 
I couldn't make sense of the Qualcomm website to find the driver I might need. If anyone can point me to the right place I'd be very grateful.

The driver I currently have came via Dell and is v12.0.0.953 dated 14/06/2020. I rolled back to the previous version but that didn't solve the problem so I am now back on the "current" version.
Standard User candlerb
(fountain of knowledge) Wed 28-Oct-20 12:14:21
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Re: IPv6 problem


[re: GonePostal] [link to this post]
 
One possibility is your system is not receiving (or is filtering out) Router Advertisements, meaning that it forgets the default gateway.

I'm not a Windows user, but some variation of "route print" may show you the routing table, perhaps with an extra flag for IPv6. The default route is ::/0. If this vanishes after a while, then at least you understand what's going on.

This would be some sort of Windows and/or driver issue that would need fixing, or possibly a problem with firewall software (although you said a different adapter was unaffected).
Standard User jchamier
(eat-sleep-adslguide) Wed 28-Oct-20 12:33:24
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Re: IPv6 problem


[re: candlerb] [link to this post]
 
In reply to a post by candlerb:
I'm not a Windows user, but some variation of "route print" may show you the routing table, perhaps with an extra flag for IPv6. The default route is ::/0. If this vanishes after a while, then at least you understand what's going on.


route print works on Windows, and if you want to filter v6 only the -6 switch applies.

I'm following this thread with interest, although my ISP doesn't support v6 yet frown

21 years of broadband connectivity since 1999 trial - Live BQM

Edited by jchamier (Wed 28-Oct-20 12:34:11)

Standard User GonePostal
(committed) Wed 28-Oct-20 15:56:59
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Re: IPv6 problem


[re: candlerb] [link to this post]
 
Even more confused. The Qualcomm card and Realtek dongle route produce the output below using route print -6. There were no other active routes listed.

1) For Qualcomm with access to http://v6.testmyipv6.com/

C:\Users\john>route print -6
===========================================================================
Interface List
3...1c bf c0 8a 55 67 ......Qualcomm QCA9377 802.11ac Wireless Adapter
1...........................Software Loopback Interface 1
===========================================================================

IPv6 Route Table
===========================================================================
Active Routes:
If Metric Network Destination Gateway
3 4131 ::/0 fe80::6203:47ff:fe49:5767
1 331 ::1/128 On-link
3 4131 XXXX:XXXX:XXXX:XXXX:/64 On-link
3 291 XXXX:XXXX:XXXX:XXXX:1830:390f:22d2:7c6/128
On-link
3 291 XXXX:XXXX:XXXX:XXXX:a0c8:9def:8707:f27d/128
On-link
3 291 fe80::/64 On-link
3 291 fe80::1830:390f:22d2:7c6/128
On-link
1 331 ff00::/8 On-link
3 291 ff00::/8 On-link
===========================================================================
Persistent Routes:
None

2) For the Qualcomm card after trying to access http://v6.testmyipv6.com/ brings up a "We can’t connect to the server at v6.testmyipv6.com" screen:

C:\Users\john>route print -6
===========================================================================
Interface List
3...1c bf c0 8a 55 67 ......Qualcomm QCA9377 802.11ac Wireless Adapter
1...........................Software Loopback Interface 1
===========================================================================

IPv6 Route Table
===========================================================================
Active Routes:
If Metric Network Destination Gateway
3 4131 ::/0 fe80::6203:47ff:fe49:5767
1 331 ::1/128 On-link
3 4131 XXXX:XXXX:XXXX:XXXX:/64 On-link
3 291 XXXX:XXXX:XXXX:XXXX:1830:390f:22d2:7c6/128
On-link
3 291 XXXX:XXXX:XXXX:XXXX:a0c8:9def:8707:f27d/128
On-link
3 291 fe80::/64 On-link
3 291 fe80::1830:390f:22d2:7c6/128
On-link
1 331 ff00::/8 On-link
3 291 ff00::/8 On-link
===========================================================================
Persistent Routes:
None

3) For comparison, the Realtek dongle with connection to http://v6.testmyipv6.com/

C:\Users\john>route print -6
===========================================================================
Interface List
13...1c bf ce b5 8a 74 ......Realtek 8811CU Wireless LAN 802.11ac USB NIC
1...........................Software Loopback Interface 1
===========================================================================

IPv6 Route Table
===========================================================================
Active Routes:
If Metric Network Destination Gateway
13 4131 ::/0 fe80::6203:47ff:fe49:5767
1 331 ::1/128 On-link
13 4131 XXXX:XXXX:XXXX:XXXX:/64 On-link
13 291 XXXX:XXXX:XXXX:XXXX:4d6:45be:e1ed:7210/128
On-link
13 291 XXXX:XXXX:XXXX:XXXX:c5c6:cf47:87a7:ac91/128
On-link
13 291 fe80::/64 On-link
13 291 fe80::4d6:45be:e1ed:7210/128
On-link
1 331 ff00::/8 On-link
13 291 ff00::/8 On-link
===========================================================================
Persistent Routes:
None

Does that offer any clues to anyone?
Standard User Andrue
(eat-sleep-adslguide) Wed 28-Oct-20 18:31:43
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Re: IPv6 problem


[re: GonePostal] [link to this post]
 
In reply to a post by GonePostal:
Current situation is IDNet FTTC connection, Billion 8800AXL r2 modem.router, Dell Inspiron laptop with Qualcomm QCA9377 802.11ac Wireless Adapter. All drivers are up to date. IPv6 configuration is enabled in the LAN page of the router GUI and in the configuration tab for the Adapter.
IPv6 dropped randomly with my Billion but that was on the WAN side. When I talked to Support they said it wasn't renewing the IPv6 lease very often (like maybe once a day) whereas other routers renew hourly.

I switched to a Draytek 2762 and it's been fine ever since. I don't think my local machines were affected though.

---
Andrue Cope
Brackley, UK

Edited by Andrue (Wed 28-Oct-20 18:39:57)

Standard User GonePostal
(committed) Thu 29-Oct-20 17:59:46
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Re: IPv6 problem


[re: GonePostal] [link to this post]
 
Unexpectedly I bumped into the owner of the holiday let next door this afternoon and got his permission to connect to his WiFi network. His ISP is BT and he has HH6 router. I connected to his 2.4GHz network and had connection to http://v6.testmyipv6.com/. Within 10 minutes this had dropped with the "We can’t connect to the server at v6.testmyipv6.com" message.

I raised the problem with Dell Technical Support a couple of days ago and got a long script about Hard Reset, Dell Diagnostic Test, reinstallation of W10 etc. etc. and the comment that it looked like my router (despite the WiFi dongle connecting with no problems). They also asked if I could try on another network so we'll see what comes back after they read my report about the connection dropping on the other network.
Standard User GonePostal
(committed) Fri 30-Oct-20 20:40:53
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Re: IPv6 problem


[re: GonePostal] [link to this post]
 
I've done a bit more digging and have found the IPv6 dropping in the same way on a very old HP Netbook with a Qualcomm Atheros wireless card. I have passed all this on to Dell Support. Their reply is:

"Thank you for the email. Based on the information you provide it seems that the issue is with the software since it is also happening on the HP device. I would like to inform you that we only support basic software and we have different department for advance software team. You can contact them through the details below."

The details are a £48 no-fix no-fee consultation with a Dell certified expert.

My response is that it is a 5-month old machine supplied by Dell. It is not my problem that the Qualcomm kit does not seem to be working correctly. It is up to Dell as supplier to fix the machine so it works properly or replace it with one that does. I have asked how we escalate so more news to follow!
Standard User E300
(regular) Sat 31-Oct-20 13:12:38
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Re: IPv6 problem


[re: GonePostal] [link to this post]
 
Have you tried disabling all power management options for the Qualcomm card in the laptop?

I also found this link https://answers.microsoft.com/en-us/windows/forum/wi... not sure if that helps but seems to be the same problem.
Standard User GonePostal
(committed) Sat 31-Oct-20 22:45:31
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Re: IPv6 problem


[re: E300] [link to this post]
 
In reply to a post by E300:
Have you tried disabling all power management options for the Qualcomm card in the laptop?

I also found this link https://answers.microsoft.com/en-us/windows/forum/wi... not sure if that helps but seems to be the same problem.


Thanks for the response.

Before I raised the issue with Dell I spent a while trawling the internet with two outcomes. Firstly I have tried all of the remediation actions such as those suggested in your link; each time the IPv6 reconnects then drops again after a short while. Secondly there are now a small number of discussion topics where the specific IPv6 drop is being mentioned rather than general loss of connectivity so the problem is maybe only now being exposed as more people are becoming aware of IPv6. The IPv6 problem is reported as affecting a number of different makes of computer, the only common factor being the Qualcomm card and there are a couple of reports of Dell users taking out the Qualcomm card and using an Intel card instead. However if I am reading things correctly the Qualcomm chip is now built in to the Dell motherboard so it is no longer an easy lift and shift.

At the end of the day it is not a show stopper as I can always use the WiFi dongle if I must have IPv6 connectivity but I am aggravated with the attitude of a supplier who thinks they can supply kit that does not work as expected then walk away and leave you to it.
Standard User prlzx
(experienced) Sun 01-Nov-20 05:44:45
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Re: IPv6 problem


[re: GonePostal] [link to this post]
 
Keep on at Dell!

Additional evidence you can gather:

1. If the laptop has a built in wired ethernet nic, confirm that does not drop its IPv6 connection when wired to the router or a switch. That would be 2 NICs against the Q-A Wi-Fi nic on otherwise the same hardware with the same OS environment.

2. Open 2 terminals and run continuous pings, one to an IPv6 address in the same subnet on your LAN and another to an external IPv6 address - checks if you lose both together or only the traffic that needs to route through a gateway

3. If the Q-A nic is supported under open source environments,
Ubuntu Certification
Linux Hardware Project

temporarily boot from a USB stick or DVD to rule out Window's drivers for this nic.
Lubuntu 20.10 or KDE Neon should suffice for this.



prlzx on Zen: FTTC (VDSL) at ~40Mbps / 10Mbps
with IP4/6 (no v6? - not true Internet)

Edited by prlzx (Sun 01-Nov-20 05:50:49)

Standard User GonePostal
(committed) Tue 24-Nov-20 11:41:20
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Re: IPv6 problem


[re: prlzx] [link to this post]
 
Update on the situation.

After I asked the Dell Technical Support how to escalate the situation as I was not satisfied with their response there was silence. I gave it a couple of nudges then sent a polite e-mail to the CEO (details from https://www.ceoemail.com/) asking how we could take the matter forward. Within 24 hours I had an e-mail from their Advanced Resolution Services which led to me summarising the problem to their Consumer Resolution Manager. The upshot of the discussion was that a technician was despatched from their local service centre with an Intel Wireless NIC to replace the Qualcomm part. The technician was not tasked with carrying out any tests but just to accept the problem at face value and make the replacement. Intel card now in and working so we'll see what happens.

It is providential that he did not carry out any tests! In advance of the visit I took out the dongle and monitored the Qualcomm card which over the last 24 hours had one brief drop-out from IPv6 and re-connected by itself. The only difference in circumstances since I noticed the drop-out problem is that the next door holiday let has been unoccupied while we are in lockdown and their router has been powered down. It may be that the Qualcomm driver is not handling WiFi network conflict well but that is only a guess.

Edited by GonePostal (Tue 24-Nov-20 11:41:56)

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