Implements DHCP option 15 (Domain Name) for systemd-networkd's DHCP server, allowing administrators to configure the DNS default domain that clients should use. This addresses the feature request in issue #37077, where users needed to manually configure domain names using SendOption=15:string:example.com as a workaround. This adds two new configuration options to the [DHCPServer] section: - EmitDomain= (boolean): whether to send domain name to clients - Domain= (string): the domain name to send (e.g., "example.com") Example configuration: [DHCPServer] EmitDomain=yes Domain=example.com This eliminates the need for manual workarounds using SendOption=15:string:... Fixes #37077
System and Service Manager
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