I have some systems connected via a simple stupid ethernet switch. Under usual conditions, the switch is connected to a large network providing DHCP service and Internet gateway. However, if the group gets disconnected from the large network, or the DHCP is down, no adresses are assigned and the subnetwork stays unconfigured. I like to have the subnetwork usable in any case.
Can this be done by a proper
network-manager config? Like defining additional manual assigne IPs, that are overridden if DHCP comes available?
Is this a use case for avahi / zeroconf?
Is it possible to keep the DHCP assigned IPs as long as the DHCP is unavailable, even if a system reboots?