Final 6.2.1 update causing LAN instability/sluggishness

_frantic_ wrote:
@dsnpevl: I have connected both ReadyNAS and PC to a switch. The router is connected to the same switch. In this constellation, PC and ReadyNAS can talk to each other even when the router goes down.

Yes, tried that too, but for me when the RN516 is on, no matter where in the LAN, it disables the router anyway. Then the IP addresses no longer get resolved and I cannot access anything from my PC. I now have the PC on the switch and the switch on the router. The RN is directly on another port of the router.

Trying downgrading to 1.26 now.
Update1: first signs are promissing for the downgrade to connman 1.26 on final OS 6.1.2. Will try some shutdown/restart next to see if it keeps working. Also: the weird second listing of the LAN2 NIC in the router has disappeared now.
Update2: After shutdown and power-off and power-on, the connection still works. Will try restart from web admin next.
Update3: Takes a very long time to reboot. The web admin is telling me: "Connection lost. Connection could not be restored. Please reboot your device manually and try again". But actually, the RN was still rebooting (it says "booting..." in the front display). When you wait long enough, the connection comes back and no router issues. The web gui needs to learn to have a little patience...
Update4: Actually remebered the issues with the port forwarding, so I powered down the RN (again) and re-instated my port forwardings on the router. After restart the network stays alive and I can access from the web admin. Next I will shut down/power down and move the RN back to it's opertional posistion. If that works, the fix above has been proven sound, from my perspective.
Update5: I moved the RN back near the switch and restarted it. Connections are still working and my website fotografeer.nl is up-and-running again, finally. I consider the fix decribed above a success. Thanks to all for starting threads on this issue. And many thanks to _frantic_ for finding the root cause. Netgear should be forever in our debt for doing their work for them :)

So this fix works for me:
- Look for the installed versions of connman:

apt-cache showpkg connman

- Provided 1.26-netgear1 is listed, you can then downgrade from 1.27-netgear1 to 1.26-netgear1

sudo apt-get install connman=1.26-netgear1

- Details and full screen output above.

Enjoy your holidays and have a happy new year with many trouble-free OS updates!