Public bug reported:
network manager does not properly deprecate autoconfigured temporary IP
addresses when ValidLifetime for a prefix is 0 in router advertisements. This
behaviour is non-compliant with RFC 4861 ยง 6.3.4, which reads:
If the prefix is already present in the host's Prefix List as
the result of a previously received advertisement, reset its
invalidation timer to the Valid Lifetime value in the Prefix
Information option. If the new Lifetime value is zero, time-out
the prefix immediately.
The hosts instead continued to use temporary addresses configured until
they reached their timeout, rather than immediately dropping the
addresses. It further appears that it is generating new temporary
addresses when the previous ones expire, but I have not been monitoring
hosts closely enough to tell for sure---I will update on this when I
have further information.
This problem was discovered on Ubuntu Studio 16.04.2; it is not present
on Ubuntu Server (which uses Debian networking scripts).
Additional Info:
$ lsb_release -rd
Description: Ubuntu 16.04.2 LTS
Release: 16.04
$ apt-cache policy network-manager
network-manager:
Installed: 1.2.6-0ubuntu0.16.04.1
Candidate: 1.2.6-0ubuntu0.16.04.1
Version table:
*** 1.2.6-0ubuntu0.16.04.1 500
500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64
Packages
100 /var/lib/dpkg/status
1.2.2-0ubuntu0.16.04.4 500
500 http://security.ubuntu.com/ubuntu xenial-security/main amd64
Packages
1.1.93-0ubuntu4 500
500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
** Affects: network-manager (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1699942
Title:
network-manager fails to deprecate addresses
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