====== Hardware-NAT ======

  * available in LEDE [[http://forum.banana-pi.org/t/bpi-r2-lede-source-code-for-hardware-nat/3940|forum]]
  * seems to work with 4.14, Test: https://github.com/frank-w/BPI-R2-4.14/tree/4.14-hnat [[http://forum.banana-pi.org/t/bpi-r2-kernel-4-14-hnat/4486/43|forum]]
  * no support in 4.4.70 [[http://forum.banana-pi.org/t/bpi-r2-lede-source-code-for-hardware-nat/3940/15|forum]]

Current implementation works only between lan and wan (not wifi or other interfaces)

at least you have to setup nat on wan:
<code>
ipt=/sbin/iptables
if_wan=wan
${ipt} -t nat -F
${ipt} -t nat -A POSTROUTING -o ${if_wan} -j MASQUERADE
</code>

and load hnat-module:

  modprobe mtkhnat

Check if it is working with
<code>
#via debugfs (working shows BIND-state)
cat /sys/kernel/debug/hnat/all_entry
#via interrupts (counter does not increase after a while (download))
cat /proc/interrupts | grep 'ethernet'
</code>

[[https://github.com/garywangcn/bpi-r2_lede/commit/ef3ced07e505b40e04724f257dffea9c4d388fca#diff-c6d162794f4d9c3773b8a3ef2375785b|original-Patch for 4.9 (lede)]]