8.2.6. Other Interfaces

ifcfg-lo — A local loopback interface is often used in testing, as well as being used in a variety of applications that require an IP address pointing back to the same system. Any data sent to the loopback device is immediately returned to the host's network layer.

ifcfg-irlan0 — An infrared interface allows information between devices, such as a laptop and a printer, to flow over an infrared link. This works in a similar way to an Ethernet device except that it commonly occurs over a peer-to-peer connection.

ifcfg-plip0 — A Parallel Line Interface Protocol (PLIP) connection works much the same way as an Ethernet device, except that it utilizes a parallel port.

ifcfg-tr0 — Token Ring topologies are not as common on Local Area Networks (LANs) as they once were, having been eclipsed by Ethernet.