I have a kubernetes cluster v 1.19.4 set up with several nodes and services. Some of these services need to access an external resource residing outside the cluster. I have understood that this external resource can be defined by a service without label selector and then manually creating an Endpoints object to set the resource IP.

My question is one of convenience; the external service needs to be configured to allow connections from distinct IPs, and because of that I'd like to route all requests to this service to be handled by a specific node; so I know that the cluster-services will only communicate to this external resource via a single IP, regardless of from which node the request originates.

Is this possible by assigning nodeSelectors to the service definition in kubernetes or endpoints-object, or by some other means?

The requirement could be described with a networking likeness: I'd like to achieve what a router does for it's clients: present a single ip regardless of which client makes an outbound request to the wan.

thanks