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SUMMARY
connection_options work differently when detecting changes for 802-3-ethernet.mtu parameter. It causes problems with applying mtu setting.
Fixes #3612
ISSUE TYPE
COMPONENT NAME
plugins/modules/net_tools/nmcli.py
ADDITIONAL INFORMATION
I guess it's better not to devide two scenarious(detect_change true and false) in terms of 802-3-ethernet.mtu and apply auto mtu by default. This change causes setting 802-3-ethernet.mtu to "auto" when mtu parameter not specified for dummy,ethernet,team-slave types, but it looks like right decision in this case. Correct me if i'm wrong.