This directory contains generic network interface device drivers that do not contain any hardware or architecture specific code. The files are: etharp.c Implements the ARP (Address Resolution Protocol) over Ethernet. The code in this file should be used together with Ethernet device drivers. Note that this module has been largely made Ethernet independent so you should be able to adapt this for other link layers (such as Firewire). ethernetif.c An example of how an Ethernet device driver could look. This file can be used as a "skeleton" for developing new Ethernet network device drivers. It uses the etharp.c ARP code. loopif.c A "loopback" network interface driver. It requires configuration through the define LWIP_LOOPIF_MULTITHREADING (see opt.h). slipif.c A generic implementation of the SLIP (Serial Line IP) protocol. It requires a sio (serial I/O) module to work. ppp/ Point-to-Point Protocol stack The PPP stack has been ported from ucip (http://ucip.sourceforge.net). It matches quite well to pppd 2.3.1 (http://ppp.samba.org), although compared to that, it has some modifications for embedded systems and the source code has been reordered a bit.
