Comment 26 for bug 1234469

I resolved the problem by editing the keyfile plugin /etc/NetworkManager/NetworkManager.conf by appending
[connection]
id=Auto eth0
uuid=<-----------------------your connection uuidd, find it with the command $ nmcli -p c list
type=802-3-ethernet
autoconnect=true
timestamp=0

[ipv4]
method=auto

[802-3-ethernet]
mac-address=<---------your router mac address