IPv6 working, just barely

ext/lwip/src/netif/FILES

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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:
+
+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.
+
+lowpan6.c
+          6LoWPAN implementation
+
+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 ppp/PPPD_FOLLOWUP for a detailed explanation.