• [6.9.2] Docker version 20.10.2 through 20.10.5, regression in docker-proxy when using IPv6 with containers in bridge network

    Thx And Bye

    By Thx And Bye

      • Minor

    This isn't specifically a UnRAID problem but I'm putting it here for visibility and awareness, as UnRAID v6.9.2 is affected by this bug.  

    I already commented about the problem over here: UNRAID 6.9.2 - DOCKER CONTAINER NOT REACHABLE OVER THE INTERNET WITH IPV6

     

    There is a problem in the networking engine of Docker when using IPv6 with a container that has only a IPv4 assigned in a bridged network. Prior to Docker version 20.10.2 IPv6 traffic was forwarded to the container regardless. This behavior changed with version 20.10.2. This is the pull request that changed this behavior: Fix IPv6 Port Forwarding for the Bridge Driver 

    A fix for this regression was issued 4 days later: Fix regression in docker-proxy but this wasn't implemented into Docker until version 20.10.6.  

     

    For me this is just a minor issue as I have a full dual-stack connection and switched to only IPv4 for now, but for people using a connection via DS-Lite, this could mean that their docker-containers that are operating in bridged mode aren't accessible from outside of their home network anymore (like PLEX or Nextcloud).

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    FlamongOle

    Got affected by this when I swapped ISP, have been scratching my head some days because of this. Thanks. I believe next Unraid version will fix this whenever it launches.

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