Comment 11 for bug 1775131

Failed Logs:
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Apr 16 10:56:27 u18_svr_madsz systemd-udevd[30948]: link_config: autonegotiation is unset or enabled, the speed and duplex are not writable.
Apr 16 10:56:27 u18_svr_madsz systemd-udevd[30948]: Could not generate persistent MAC address for 2icx0: No such file or directory
Apr 16 10:56:27 u18_svr_madsz systemd-networkd[22168]: 2icx0: Gained carrier
Apr 16 10:56:27 u18_svr_madsz networkd-dispatcher[824]: WARNING:Unknown index 71 seen, reloading interface list
Apr 16 10:56:27 u18_svr_madsz systemd-timesyncd[22214]: Network configuration changed, trying to establish connection.
Apr 16 10:56:27 u18_svr_madsz systemd-udevd[30960]: link_config: autonegotiation is unset or enabled, the speed and duplex are not writable.
Apr 16 10:56:27 u18_svr_madsz systemd-udevd[30960]: Could not generate persistent MAC address for 2icx1: No such file or directory
Apr 16 10:56:28 u18_svr_madsz systemd-networkd[22168]: 2icx1: Gained carrier
Apr 16 10:56:28 u18_svr_madsz networkd-dispatcher[824]: WARNING:Unknown index 72 seen, reloading interface list
Apr 16 10:56:28 u18_svr_madsz systemd-networkd[22168]: 2icx0: Lost carrier
Apr 16 10:56:28 u18_svr_madsz systemd-timesyncd[22214]: Synchronized to time server 91.189.89.199:123 (ntp.ubuntu.com).
Apr 16 10:56:29 u18_svr_madsz systemd-networkd[22168]: 2icx1: Gained IPv6LL

Successful Logs:
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Apr 16 12:10:38 u18_svr_madsz systemd-udevd[31348]: link_config: autonegotiation is unset or enabled, the speed and duplex are not writable.
Apr 16 12:10:38 u18_svr_madsz systemd-networkd[22168]: 2icx0: Gained carrier
Apr 16 12:10:38 u18_svr_madsz systemd-timesyncd[22214]: Network configuration changed, trying to establish connection.
Apr 16 12:10:38 u18_svr_madsz networkd-dispatcher[824]: WARNING:Unknown index 75 seen, reloading interface list
Apr 16 12:10:38 u18_svr_madsz systemd-udevd[31348]: Could not generate persistent MAC address for 2icx0: No such file or directory
Apr 16 12:10:38 u18_svr_madsz systemd-udevd[31358]: link_config: autonegotiation is unset or enabled, the speed and duplex are not writable.
Apr 16 12:10:38 u18_svr_madsz systemd-udevd[31358]: Could not generate persistent MAC address for 2icx1: No such file or directory
Apr 16 12:10:38 u18_svr_madsz systemd-networkd[22168]: 2icx1: Gained carrier
Apr 16 12:10:38 u18_svr_madsz networkd-dispatcher[824]: WARNING:Unknown index 76 seen, reloading interface list
Apr 16 12:10:38 u18_svr_madsz systemd-timesyncd[22214]: Synchronized to time server 91.189.91.157:123 (ntp.ubuntu.com).
Apr 16 12:10:39 u18_svr_madsz systemd-networkd[22168]: 2icx0: Gained IPv6LL
Apr 16 12:10:40 u18_svr_madsz systemd-networkd[22168]: 2icx1: Gained IPv6LL