You have been subscribed to a public bug:
This is occurring on Ubuntu 20.04 with kernel 5.4.0-56-generic.
To demonstrate, run
$ sudo tcpdump -nv -ienp4s0 igmp
(adjusting the interface name appropriately).
The result will be 0 packets captured, even though all other Ubuntu systems on
the same ethernet
lan are reporting igmp queries from the router and responding with reports
every minute or so.
One consequence of this is that a CUPS server using the Comet Lake onboard
ethernet controller
cannot be detected by any clients, except within the first 120 seconds after
restarting the
avahi-daemon. Since the Comet Lake server does not receive the igmp queries, it
does not respond
with a report and so the router unsubscribes the interface from the multicast
group that is used
by avahi and bonjour. This makes the CUPS server disappear.
The output of ubuntu-bug linux is attached.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: bot-comment
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igc driver for Comet Lake onboard 15f3 NIC drops all igmp packets
https://bugs.launchpad.net/bugs/1906418
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