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+This directory contains generic network interface device drivers that
+do not contain any hardware or architecture specific code. The files
+are:
+
+ethernet.c
+          Shared code for Ethernet based interfaces.
+
+lowpan6.c
+          A 6LoWPAN implementation as a netif.
+
+lowpan6_ble.c
+          A 6LoWPAN over Bluetooth Low Energy (BLE) implementation as netif,
+          according to RFC-7668.
+
+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 lwIP PPP support is based from pppd (http://ppp.samba.org) with
+          huge changes to match code size and memory requirements for embedded
+          devices. Please read /doc/ppp.txt and ppp/PPPD_FOLLOWUP for a detailed
+          explanation.