RFC3442 specifies option 121 (Classless Static Routes) that allow a DHCP
server to push arbitrary routes to a client. It has a Local Subnet
Routes section expliciting the behavior of routes with a null (0.0.0.0)
gateway.
Such routes are to be installed on the interface with a Link scope, to
mark them as directly available on the link without any gateway.
Networkd currently drops those routes, which is against the RFC, as
Linux has proper support for such routes.
Fixes: 7f20627 ("network: dhcp4: ignore gateway in static routes if destination is link-local or in the same network")
System and Service Manager
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