** Bug watch added: Linux Kernel Bug Tracker #200331
   https://bugzilla.kernel.org/show_bug.cgi?id=200331

** Also affects: linux via
   https://bugzilla.kernel.org/show_bug.cgi?id=200331
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1779173

Title:
  Dell D6000 dock lacks multicast Ethernet functionality

Status in Linux:
  Unknown
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Dell D6000 exposes a CDC_NCM device for Ethernet traffic. However,
  multicast Ethernet traffic is not processed making IPv6 not
  functional. Other services, like mDNS used for LAN service discovery
  are also hindered.

  The actual reason is that CDC_NCM driver was not processing requests
  to filter (admit) multicast traffic. I provide two patches to the
  linux kernel that admit all Ethernet multicast traffic whenever a
  multicast group is being joined.

  The solution is not optimal, as it makes the system receive more
  traffic than that strictly needed, but otherwise this only happens
  when the computer is connected to a dock and thus is running on AC
  power. I believe it is not worth the hassle to join only the requested
  groups. This is the same that is done in the CDN_ETHER driver.

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