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 Fairphone 4 dropping WIFI connection from FRITZ!Box 7582
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| pawelz |
Veröffentlicht am 29-05-2022 14:48
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 0-10 Beiträge  » CH » FRITZ!Box 7582 Beiträge: 3 Trat bei: 29.05.22 |
Hello, I hope it is fine to post in English, I couldn't find an English-speaking forum for Fritz, and my German isn't quite good enough. I'm having a WiFi issue between a FritzBox router and an Android 11 phone. My phone keeps dropping WiFi connection. It connects to the WiFi, gets IPv4 assigned from DHCP, negotiates IPv6, and a second later it disconnects. Then it connects again and the whole cycle repeats. The cycle takes a few seconds. The network does work during the brief intervals of connectivity. For example IM messages come through even when I disable mobile data. This only happens on my home WiFi, the phone works just fine on other WiFis. Other WiFi devices work just fine on my home WiFi. The phone is Fairphone 4 running FP4.FP3V.A.116.20220414. The WiFi router is Fritz!Box7582 (although DHCP is served by another device based on Raspberry PI). I also have a WiFi repeater from Fritz, I can repro the issue regardless of whether I am next to the router or next to the repeater. What I tried already: - to separate 2.4GHz and 5GHz networks. I though maybe it swaps between bands. But once I assigned separate SSIDs to the bands, the issue still happens, regardless if I connect to the 2.4 or 5 network. - to disable random MAC (mostly to get another MAC and IP and so make sure this isn't some DHCP conflict). - to disable mobile data. None of these helped. Here are some log lines that I think might be relevant: Code Download source
The issue very much looks like the one discussed in that thread, however the workaround described there (to disable mobile data) doesn't work for me. I have also found that thread which sounds a bit similar. Neither setting low channel for 5GHz wifi nor switching to 802.11n+a helped. Other devices works well on the new settings, so I don't think this is interference from other networks. Any ideas? What can I do to debug this? |
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| pawelz |
Veröffentlicht am 29-05-2022 14:58
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0-10 Beiträge » CH » FRITZ!Box 7582 Beiträge: 3 Trat bei: 29.05.22 |
Solved by disabling IPv6 on the router. Which strongly indicates that this is a bug on Android side and not with the router. Sorry for the noise here. |
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| pawelz |
Veröffentlicht am 29-05-2022 15:38
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0-10 Beiträge » CH » FRITZ!Box 7582 Beiträge: 3 Trat bei: 29.05.22 |
Okay, now I understand the problem, so a final update in case this comes useful to someone: Turns out I had the following option enabled: > Disable DHCPv6 server in the FRITZ!Box: > - Enable the M and the O flags in the router advertisement messages of the FRITZ!Box (SLAAC possible) I only run DHCPv4 on the network, I rely on SLAAC for IPv6 (and manually setting IP addresses for devices where I care about static IPs). So it was incorrect to send the M and the O flags, as they mean that devices should look for DHCPv6 service. Other devices are fine with that, but apparently Fairphone is not. Once I changed the config on the router to: > Disable DHCPv6 server in the FRITZ!Box: > - There are no other DHCPv6 servers in the home network everything works fine. The IPv6 works (including on the phone), and WiFi is stable now. |
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| Fritzie |
Veröffentlicht am 05-06-2022 10:14
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 Admin  » DE » FritzBox 7430 Beiträge: 722 Trat bei: 05.05.21 |
Thanks for the feedback. I'm sure it will help some one in the future. 
In meiner Freizeit versuche ich so gut ich kann zu helfen. Geduld ist eine Tugend. 🙏
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