[Bug 2000001] Re: Wifi 5/6 dropped randomly if ipv6 is enabled - Bug dhcp6!!!

[Linuxonlinehelp_de]

I could not determine exactly which part was having the problems, seems
to me the dhcp client package or API to network-managers.

To this ubuntu develop/changes much on parts the network management
handling ubuntu go other ways than other Debian/Linux OS.

If Company's disable IPV6 on local LAN for easy Firewall-Security-Handling, they will run into problems. 
I know IPv6 should be implemented but on small Areas it makes less sense.

Users have still Problems on "easy" managing IPv6. They wont use small
Routers to route local devices to the Internernet Provider's IPv6-DHCP
Servers.

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Title:
  Wifi 5/6 dropped randomly if ipv6 is enabled - Bug dhcp6!!!

Status in dhcp package in Ubuntu:
  New
Status in dhcpcd package in Ubuntu:
  New
Status in dhcpcd5 package in Ubuntu:
  New
Status in isc-dhcp package in Ubuntu:
  New
Status in network-manager package in Ubuntu:
  New
Status in network-manager-applet package in Ubuntu:
  New
Status in wicd package in Ubuntu:
  New

Bug description:
  Updated: 19.12.2022
  #####################

  Hi Support

  at startup of analysis:
  Wifi5/6 dropped randomly if ipv6 is enabled/disabled on gnome-network-manager-gui no Error on Logs! No red Kernel Messages.

  
  My Lab:
  At my Lab i disabled all ipv6 on my Subnet LAN Openwrt-Routers, and my Laptop loses "randomly" 20times a day the Internet but the Signal is 100% to the WIFI-Routers, no ping, no nslookup to first DSL-WAN Router possible.

  First Handling:
  After i manual enable/disable WIFI by switch is works again fast.

  
  Analysis:
  After some search on Net i disabled ipv6 in sysctl.conf !

  GTK-Apps Affected: seen on network-manager/network-manager-gnome/wicd
  Managers

  Hardware Change/Test:
  I tested / changed 3 different old wifi-5+ new wifi-6 intel AX 7260 HMW mini-pci-cards same problem!

  Now testing again..

  Thanks
  Linuxonlinehelp_eu

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: network-manager 1.10.6-2ubuntu1.4
  ProcVersionSignature: Ubuntu 5.4.0-135.152~18.04.2-generic 5.4.212
  Uname: Linux 5.4.0-135-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.9-0ubuntu7.28
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Dec 18 11:24:20 2022
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2021-08-19 (486 days ago)
  InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
  IpRoute:
   default via 192.168.71.1 dev wlp3s0b1 proto dhcp metric 600
   169.254.0.0/16 dev wlp3s0b1 scope link metric 1000
   192.168.71.0/24 dev wlp3s0b1 proto kernel scope link src 192.168.71.123 metric 600
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  WifiSyslog:

  http_proxy: http://127.0.0.1:8118/
  modified.conffile..etc.NetworkManager.conf.d.default-wifi-powersave-on.conf:
   [connection]
   wifi.powersave = 2
  mtime.conffile..etc.NetworkManager.conf.d.default-wifi-powersave-on.conf: 2022-06-30T19:17:37.737049
  nmcli-dev:
   DEVICE    TYPE      STATE        DBUS-PATH                                  CONNECTION  CON-UUID                              CON-PATH
   wlp3s0b1  wifi      connected    /org/freedesktop/NetworkManager/Devices/3  AXWIFI71    bec4545b-24e6-40ef-a933-43121b9b819b  /org/freedesktop/NetworkManager/ActiveConnection/3
   enp2s0    ethernet  unavailable  /org/freedesktop/NetworkManager/Devices/2  --          --                                    --
   lo        loopback  unmanaged    /org/freedesktop/NetworkManager/Devices/1  --          --                                    --
  nmcli-nm:
   RUNNING  VERSION  STATE      STARTUP  CONNECTIVITY  NETWORKING  WIFI-HW  WIFI     WWAN-HW  WWAN
   running  1.10.6   connected  started  full          enabled     enabled  enabled  enabled  enabled
  no_proxy:

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