This bug was fixed in the package network-manager - 1.30.0-1ubuntu4
---------------
network-manager (1.30.0-1ubuntu4) impish; urgency=medium
* d/t/nm.py: adapt to changes dnsmasq behavior (LP: #1894619)
-- Christian Ehrhardt <christian.ehrha...@canonical.com> Fri, 02 Jul
2021 11:13:46 +0200
** Changed in: network-manager (Ubuntu Impish)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1894619
Title:
[2.82 regression] router announcements have 'forever' lifetime by
default
Status in dnsmasq package in Ubuntu:
Triaged
Status in network-manager package in Ubuntu:
Fix Released
Status in dnsmasq source package in Groovy:
Fix Released
Status in network-manager source package in Groovy:
Invalid
Status in dnsmasq source package in Hirsute:
Fix Released
Status in network-manager source package in Hirsute:
Invalid
Status in dnsmasq source package in Impish:
Triaged
Status in network-manager source package in Impish:
Fix Released
Status in dnsmasq package in Debian:
Fix Released
Bug description:
The default lifetime was changed to 1 day in 2.82 in the change
corresponding to this changelog entry:
Change default lease time for DHCPv6 to one day.
Fine, but the same commit also did this:
Alter calculation of preferred and valid times in router
advertisements, so that these do not have a floor applied
of the lease time in the dhcp-range if this is not explicitly
specified and is merely the default.
And that change is buggy and causes advertisements to have infinite
lifetime, when you are using the default.
See this thread
http://lists.thekelleys.org.uk/pipermail/dnsmasq-
discuss/2020q3/014341.html
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