Public bug reported:
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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Patch added: "[PATCH 1/2] Hook into usbnet_change_mtu respecting usbnet
driver_info"
https://bugs.launchpad.net/bugs/1779173/+attachment/5157467/+files/0001-Hook-into-usbnet_change_mtu-respecting-usbnet-driver.patch
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https://bugs.launchpad.net/bugs/1779173
Title:
Dell D6000 dock lacks multicast Ethernet functionality
Status in linux package in Ubuntu:
New
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.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1779173/+subscriptions
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