Link Local Addressing - Communication with Routable Addresses

Solution 1:

I guess they are talking about one physical interface with two IPv4 addresses assigned. This thought is undermined by the fact that printers have only one physical interface for data. There might anyway be another interface dedicated to management only.

This would mean that you have to assign a link-local address as well as a routable address to this interface.

Anyway, the RFC does not recommend doing so within it's own abstract IPv4 Link-Local addresses are not suitable for communication with devices not directly connected to the same physical (or logical) link, and are only used where stable, routable addresses are not available (such as on ad hoc or isolated networks). This document does not recommend that IPv4 Link-Local addresses and routable addresses be configured simultaneously on the same interface.