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Created attachment 1375721 [details]
log

Description of problem:
sometimes (1 from 5) IPv6 default gateway is removed after start of NM with connection active before.

    * Add a new connection of type "ethernet" and options "ifname testX con-name ethie" ... passed in 0.139s
    * Wait for at least "3" seconds ... passed in 3.003s
    * Execute "systemctl stop NetworkManager" ... passed in 0.448s
    * Prepare simulated test "testX" device ... passed in 4.148s
    * Execute "sysctl net.ipv6.conf.testX.accept_ra_defrtr=1" ... passed in 0.303s
    * Execute "sysctl net.ipv6.conf.testX.accept_ra_pinfo=1" ... passed in 0.303s
    * Execute "ifup testX" ... passed in 5.314s
    * Wait for at least "10" seconds ... passed in 10.010s
    When "default" is visible with command "ip -6 r |grep testX" in "20" seconds ... passed in 0.105s
    And "default" is visible with command "ip -6 r |grep testX |grep expire" in "5" seconds ... passed in 0.104s
    * Restart NM ... passed in 2.050s
    Then "default via fe" is visible with command "ip -6 r |grep testX |grep expire" for full "20" seconds ... failed in 4.414s



Version-Release number of selected component (if applicable):
1.10.3

Created attachment 1383229 [details]
[NM PATCH] device: skip IP configuration phase for external devices

Created attachment 1383230 [details]
[CI PATCH] general: update @preserve_failed_assumed_connections test

Patch to fix existing CI test

(In reply to Beniamino Galvani from comment #1)
> Created attachment 1383229 [details]
> [NM PATCH] device: skip IP configuration phase for external devices

lgtm

(In reply to Thomas Haller from comment #3)
> (In reply to Beniamino Galvani from comment #1)
> > Created attachment 1383229 [details]
> > [NM PATCH] device: skip IP configuration phase for external devices
> 
> lgtm

Applied to master:

https://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=22f32a16f5aa0a24fd124ad5788959936e22acff

and nm-1-10.

failing test in CI fixed

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:0778