NetworkManager is often associated with some voodoo - network - magic tool, that does the work on laptop, but better switch it off on server. I won't argue about that, just wanted to give you something I personally think make NM more usable.

So it is the /etc/NetworkManager/dispatcher.d - this is directory under which lay scripts which will be executed on network change. Following man-pages:

NetworkManager will execute scripts in the /etc/NetworkManager/dispatcher.d directory in alphabetical order in response to network events. Each script should be a regular executable file, owned by root.

Furthermore, it must not be writable by group or other, and not setuid.

Each script receives two arguments, the first being the interface name of the device just activated, and second an action.

• down - The interface has been deactivated.
• vpn-up - A VPN connection has been activated.
• vpn-down - A VPN connection has been deactivated.
• hostname - The system hostname has been updated. Use gethostname(2) to retrieve it.
• dhcp4-change - The DHCPv4 lease has changed (renewed, rebound, etc).
• dhcp6-change - The DHCPv6 lease has changed (renewed, rebound, etc).

So basically without manually detecting change in network events we may use the tool that was created just for this particular goal.

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