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# ========================================================
# Setup a Dumb AP, Wired backbone for OpenWRT / LEDE
# ========================================================
# Set lan logical interface as bridge (to allow bridge multiple physical interfaces)
uci set network.lan.type='bridge'
# assign WAN physical interface to LAN (will be available as an additional LAN port now)
uci set network.lan.ifname="$(uci get network.lan.ifname) $(uci get network.wan.ifname)"
uci del network.wan.ifname
# Remove wan logical interface, since we will not need it.
uci del network.wan

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# ------------------------------------------------------------------------
# Image-Builder Procedure for OpenWRT - LEDE (In this case using Debian x64 NetInstall virtual machine)
# ------------------------------------------------------------------------
su
apt-get update # Optional, make and upgrade too in case it has too many old pakackes.
apt-get install make aria2 screen ncftp -y

screen -
cd ~

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# ====================================================================================
# Steps for Main Router (must have connected internet on WAN port)
# ====================================================================================
# Set your network IP address configuration default is 192.168.1.0/24
uci set network.lan.ipaddr='192.168.1.1'

# Recommended, to identify on network and when logged on
uci set system.@system[0].hostname='MainRouter'
uci set network.lan.hostname="`uci get system.@system[0].hostname`"

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# This is done by luci (it just sets defaults and assigns an ID to each vlan entry)
uci set network.@switch[0].mirror_source_port='0'
uci set network.@switch[0].mirror_monitor_port='0'
uci set network.@switch_vlan[0].vid='1'
uci set network.@switch_vlan[1].vid='2'

# For tl-wr1043nd-v2:
# Switch, LAN (on tl-wr1043nd-v2 we must enable tagging on CPU port 0)
uci set network.@switch_vlan[0].ports='0t 1 2 3 4' # previously '0 1 2 3 4'
# Switch, WAN

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# This is to use on image building process to make TP-Link have autoconfigured with factory SSID and KEY

mkdir ./files/etc/uci-defaults/
cat <<'__EOF__' > ./files/etc/uci-defaults/99_default-no-eth.sh
#!/bin/sh

[ "$(uci -q get system.@system[0].init)" = "" ] && exit 0
[ -e /etc/init ] && exit 0
touch /etc/init
uci batch <<EOC

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# Instructions to Install OpenWRT or LEDE on WD MBL Western Digital MyBookLive (Tested on Single, but it should work on Duo too)

# ------------------------------------------------------------------------------------
# Initial preparation (Using a Debian VM)
# ------------------------------------------------------------------------------------

# Recommended to use a Linux / Debian box with wget, dd, gunzip, lsblk
# Using a Debian box (it could be a VM) with the harddrive connected (it could be a minimal net-install Debian)
See ip with:
ip addr show

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In experience to get a proper working multiple wan configuration using mwan3 starting from scratch you should:

Important: this works well on OpenWRT 15.05.1, on newer versions there was some breaking changes, for example, the wan ifaces have ipv6 capability and now are named with letters ("wan, wanb... , wanc" instead of "wan, wan2... wan3" so wanb6 means 2nd wan ipv6.): https://github.com/openwrt/packages/blob/master/net/mwan3/files/etc/config/mwan3

The official documentation seems to be very detailed and up to date, I recommend reading those first: https://openwrt.org/docs/guide-user/network/wan/multiwan/mwan3 but I recommend to give a look at my config file below, since my approach for policyes is very nice.

First of all: Activate conntrack, docs says that is important and neccesary to get MWAN3 work properly, and it is needed to reboot:

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# Client Bridged / Client Mode / RelayD and IGMPProxy (It works)
# RelayD is to redirect packages and IGMP is for redirect IGMP packages
# Our network is 192.168.1.0/24

# Steps:
# Configure WAN as static
# We should edit our wan iface and put static IP
uci set network.wan='interface'
uci set network.wan.proto='static'
uci set network.wan.ipaddr='192.168.1.239' # Main Network IP

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# Linux Interface Bonding on Wireless Link (OpenWrt / LEDE)
# Attention: This was not tested yet.

# Important: WLAN Interfaces must be AP - STA, it does not work in ad-hoc - infraestructure mode.

# This "Adds" two interfaces in to one. In this sample we are using Wireless Interfaces

# Should be equally configured on both ends, even the hash function for the distribution of data packets

# Intallation of required packages:

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# My documentation:
#
# Important: this works well on OpenWRT 15.05.1, on newer versions there was some breaking changes, for example, the wan ifaces have ipv6 capability and now are named with letters ("wan, wanb... , wanc" instead of "wan, wan2... wan3" so wanb6 means 2nd wan ipv6.): https://github.com/openwrt/packages/blob/master/net/mwan3/files/etc/config/mwan3
#
# We have Interfaces, Members, Policyes y Rules:
#
# Interfaces: Allows to identify the wan interface, we just need to have it enabled`
# the others parameters are only to track if the interface it is up or down.
#
# Members: Can be defined in some metric and weight, both values will be important ambos when used in policyes.