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nm_platform_ip6_address_sync() tries to preserve the address preference in https://cgit.freedesktop.org/NetworkManager/NetworkManager/tree/src/platform/nm-platform.c?id=31d9a9de14dc7e529763e3210337bb6dd628a8a3#n3505

However, this works badly with IPv6 private addresses (RFC4941) and on every sync NM will delete and re-add all addresses. At least, with use_tempaddr=2.


More details follow.

fixed on master:

https://github.com/NetworkManager/NetworkManager/pull/65
https://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=fa41e5852cebb3ba5f6dde880ef792d361cc7fe9

Still needs backport to nm-1-10

looking at nm-1-10 branch...

it seems that the culprits for this bug are

https://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=19d6d54b6f8ce26039c411a0b686b7c99bc4ee49
https://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=ffc04e178bcdbcc621a1548ce8c66ff810dadcc9

Both patches are on nm-1-10/rhel-7.5. There it still looks like:

https://cgit.freedesktop.org/NetworkManager/NetworkManager/tree/src/platform/nm-platform.c?id=36d767e6d59e237dad44f2e57228e6767e636b37#n3496


Thus, I think we don't have to fix it there...


Beniamino, what do you think? Do you recall what prompted you to do "platform: improve ipv6 addresses synchronization" ?

(In reply to Thomas Haller from comment #3)
> Beniamino, what do you think? Do you recall what prompted you to do
> "platform: improve ipv6 addresses synchronization" ?

After https://bugzilla.gnome.org/show_bug.cgi?id=790061 some CI tests broke and the commit was intended to fix them (see comment 13). I think there is nothing to do for 7.5.

Ok, so no 7.5 material as the bug is only present on master.

It automatically becomes a candidate for 7.6 (if we rebase again).

Since this was not in rhel-7.5 but only a development version for rhel-7.6, this bug should not be in the changelog (for rhel-7.6).

Closing as UPSTREAM.