With systemd-networkd on the 20.04 server, the /64 prefix does not
bounce between 0s and 1s, but stays at 0s, but is not removed (nor is
the /128).
** Tags added: rls-kk-incoming
** Changed in: network-manager (Ubuntu)
Status: New => Triaged
** Also affects: systemd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1699942
Title:
network-manager fails to deprecate addresses
Status in network-manager package in Ubuntu:
Triaged
Status in systemd package in Ubuntu:
New
Bug description:
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
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