┌─────────────────────────────────────────────────┐
        |                                                 |
        |            ┌──────────┐             ┌──── lan0  + <======...
        |         ┌──┤ip forward├──┐          |           |
        |         |  └──────────┘  |          |           |
...===> + wan ────┘                └──── br1 ─┤           |
        | 192.168.1.100/24    192.168.2.1/24  |           |
        |                                     |           |
        |                                     └──── lan1  + <======...
        |                                                 |
        └─────────────────────────────────────────────────┘

nano /etc/udev/rules.d/10-network.rules
	SUBSYSTEM=="net", ATTR{address}=="[MAC_ADDR]", NAME="[INTERFACE]"
	...
	[ Save ]

nano /etc/sysctl.d/30-ipforward.conf
	net.ipv4.ip_forward=1
	[ Save ]

reboot

nano /etc/netctl/wan
	Description='WAN ...'
	Interface=wan
	Connection=ethernet
	IP=static
	Address=('[WAN_IP]/[MASK]')
	Gateway='[GATEWAY]'
	DNS=('[DNS_SERV]')
	[ Save ]

netctl enable wan
netctl start wan

pacman -S bridge-utils

nano /etc/netctl/lan_bridge
	Description='LAN Bridge'
	Interface=br0
	Connection=bridge
	BindsToInterfaces=(lan0 lan1 ... lanX)
	IP=static
	Address=('[LAN_IP]/[MASK]')

netctl enable lan_bridge
netctl start lan_bridge


_____________________________ Simple sharing _________________________________


        ┌────────────────────────────────────────┐
        |              ┌──────────┐              |
        |           ┌──┤ip forward├──┐           |
BOX     |           |  └──────────┘  |           |    PC
...===> + enp0s4 ───┘                └─── enp1s4 + <=====...
        | 192.168.1.222              192.168.2.1 |
        |                                        |
        └────────────────────────────────────────┘