Linux allows you to bind a subnet of addresses to an interface so that an application can listen on them. The netplan syntax is poorly thought out and overloads the CIDR notation to specify both the IP and netmask, so it is impossible to specify more than a single address.
I use this functionality in production for high availability configurations and effectively have to have a cron job to use 'ip' directly to fix things up.
I use this functionality in production for high availability configurations and effectively have to have a cron job to use 'ip' directly to fix things up.