A stub network is a network that can be connected to an existing infrastructure network and, to the extent possible, participate as part of that infrastructure. A stub network must be able to connect to the infrastructure network without modifications to that infrastructure network. Hosts connected to the stub network should be able to do anything that hosts connected to the infrastructure can do. 

The goal of the working group is to allow stub networks to connect automatically to the infrastructure network, so that hosts on the stub network  can communicate as if they are connected directly to the infrastructure network. Hosts and services on the stub network and the infrastructure network must be mutually discoverable, and mutually reachable. Discoverability refers to service discovery, e.g., DNSSD (RFC6763). In addition, hosts on the stub network should be able to connect to the Internet (via the infrastructure network), if desired, just as well as hosts on the infrastructure network are able to. 

The simplest use case for a stub network is to connect to a home network with a single link (called the adjacent infrastructure link) and no internal routing. And so a solution that only provides transparent connectivity between the stub network and the infrastructure link to which it is directly connected is an important first step. 

The use case for mutual reachability and discoverability on an adjacent infrastructure link is a distinct problem from the general problem of integrating with multi-link infrastructure networks because the latter case requires the stub network router to be included in the routing plane of the multi-link infrastructure network. Both cases are in scope for the working group.

This working group will coordinate with other relevant working groups such as DNSSD or 6MAN or DHC for any changes required in protocols and will make sure that those groups are included in major document reviews at appropriate times.

Deliverables:

* A framework document that explains how one or more stub routers connect a stub network to an infrastructure link. This includes providing IP addresses required for communication, routes and routing required for communication, and providing service discovery for the stub network and the adjacent infrastructure link.

* A document describing the set of interfaces that must be provided by the infrastructure network in order for stub networks to be added to the infrastructure providing full mutual reachability, addressability and discoverability between stub network hosts and hosts on adjacent and non-adjacent infrastructure links. This document additionally describes how the stub network uses these interfaces to successfully deliver the intended functionality.