NetworkManager reports error 'Failed to disable userspace IPv6LL address handling.'

Solution Verified - Updated -

Issue

  • NetworkManager is logging these errors about IPv6:

    # journalctl --no-pager -u NetworkManager -p warning
    -- Logs begin at Tue 2018-10-23 03:49:08 EDT, end at Tue 2018-10-23 03:49:24 EDT. --
    Oct 23 03:49:13 r75.example.com NetworkManager[698]: <warn>  [1540280953.6224] platform-linux: do-change-link[2]: failure changing link: failure 97 (Address family not supported by protocol)
    Oct 23 03:49:13 r75.example.com NetworkManager[698]: <warn>  [1540280953.6230] device (eth0): failed to enable userspace IPv6LL address handling (unspecified)
    Oct 23 03:49:13 r75.example.com NetworkManager[698]: <warn>  [1540280953.6890] platform-linux: do-change-link[2]: failure changing link: failure 97 (Address family not supported by protocol)
    Oct 23 03:49:13 r75.example.com NetworkManager[698]: <warn>  [1540280953.6894] device (eth0): failed to enable userspace IPv6LL address handling (unspecified)
    Oct 23 03:49:14 r75.example.com NetworkManager[698]: <warn>  [1540280954.1981] platform-linux: do-change-link[2]: failure changing link: failure 97 (Address family not supported by protocol)
    Oct 23 03:49:14 r75.example.com NetworkManager[698]: <warn>  [1540280954.1982] device (eth0): failed to enable userspace IPv6LL address handling (unspecified)
    Oct 23 03:49:14 r75.example.com NetworkManager[698]: <error> [1540280954.2106] device (eth0): addrconf6: failed to start neighbor discovery: failure creating libndp socket: Address family not supported by protocol (97)
    
    

Environment

  • Red Hat Enterprise Linux 7
  • NetworkManager

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