A computing system comprising one or more server devices within a computational instance (322, 324, 326, 328) of a remote network management platform, wherein the computational instance remotely manages computing devices of a managed network, wherein the computing devices include routers that are interconnected by subnets of the managed network and hosts that are interconnected by the subnets, wherein the managed network also includes a proxy server device communicatively coupled to at least one of the subnets, and wherein the one or more server devices are configured to: provide, for display on a client device within the managed network, a proxy server configuration pane of a graphical user interface that allows specification of the proxy server device; provide, for display on the client device, a router credentials configuration pane of the GUI that allows specification of router access credentials for the routers; provide, for display on the client device, a subnet discovery scheduling pane of the GUI that allows specification of a subnet schedule for carrying out discovery of the subnets; cause the proxy server device to perform discovery of the subnets according to the subnet schedule, wherein discovery of the subnets involves the proxy server device using the router access credentials to access the routers and obtain therefrom configuration of the subnets; receive, from the proxy server device, the configuration of the subnets; provide, for display on the client device, a host credentials configuration pane of the GUI that allows specification of host access credentials for the hosts; provide, for display on the client device, a host discovery scheduling pane of the GUI that allows specification of a host schedule for carrying out discovery of the hosts; cause the proxy server device to perform discovery of the hosts according to the host schedule, wherein discovery of the hosts involves the proxy server device using the host access credentials to, based on the configuration of the subnets, access the hosts and obtain therefrom configuration of the hosts; and receive, from the proxy server device, the configuration of the hosts. provide, for display on a client device within the managed network, a proxy server configuration pane of a graphical user interface that allows specification of the proxy server device; provide, for display on the client device, a router credentials configuration pane of the GUI that allows specification of router access credentials for the routers; provide, for display on the client device, a subnet discovery scheduling pane of the GUI that allows specification of a subnet schedule for carrying out discovery of the subnets; cause the proxy server device to perform discovery of the subnets according to the subnet schedule, wherein discovery of the subnets involves the proxy server device using the router access credentials to access the routers and obtain therefrom configuration of the subnets; receive, from the proxy server device, the configuration of the subnets; provide, for display on the client device, a host credentials configuration pane of the GUI that allows specification of host access credentials for the hosts; provide, for display on the client device, a host discovery scheduling pane of the GUI that allows specification of a host schedule for carrying out discovery of the hosts; cause the proxy server device to perform discovery of the hosts according to the host schedule, wherein discovery of the hosts involves the proxy server device using the host access credentials to, based on the configuration of the subnets, access the hosts and obtain therefrom configuration of the hosts; and receive, from the proxy server device, the configuration of the hosts.