TP-Link MR3420 software switch

Problem: devices connected via ethernet can't discover nor ping, nor establish network conenction to other devices connected via ethernet.
Solution: software switch configured as bellow.

config 'switch' 'eth0'
        option 'reset' '1'
        option 'enable_vlan' '1'

config 'switch_vlan'
        option 'device' 'eth0'
        option 'vlan' '1'
        option 'ports' '0t 1 2 3 4'
        option 'vid' '1'

Note please there is no port n. 5.
It's eth1 which you must configure as WAN interface.

And example configuration. (my whole /etc/config/network)

config 'interface' 'loopback'
        option 'ifname' 'lo'
        option 'proto' 'static'
        option 'ipaddr' '127.0.0.1'
        option 'netmask' '255.0.0.0'

config 'switch' 'eth0'
        option 'reset' '1'
        option 'enable_vlan' '1'

config 'switch_vlan'
        option 'device' 'eth0'
        option 'vlan' '1'
        option 'ports' '0t 1 2 3 4'
        option 'vid' '1'

config 'interface' 'lan'
        option 'type' 'bridge'
        option 'proto' 'static'
        option 'netmask' '255.255.255.0'
        option 'ipaddr' '192.168.77.1'
        option 'gateway' '192.168.77.1'
        option 'broadcast' '192.168.77.255'
        option '_orig_ifname' 'eth0.1 wlan0'
        option '_orig_bridge' 'true'
        option 'dns' '192.168.77.1'
        option 'ifname' 'eth0.1'

config 'interface' 'wan'
        option 'ifname' 'eth1'
        option 'proto' 'dhcp'
        option 'hostname' 'Jahrakal'

config 'interface' 'vpn'
        option 'ifname' 'tap0'
        option 'proto' 'static'
        option 'ipaddr' '192.168.201.2'
        option 'netmask' '255.255.255.0'

config 'route'
        option 'interface' 'vpn'
        option 'target' '172.17.1.0'
        option 'netmask' '255.255.255.0'
        option 'gateway' '192.168.201.1'
        option 'metric' '1'

Don't forget to configure your zones properly afterwards.


My device informations

system type             : Atheros AR7241 rev 1
machine                 : TP-LINK TL-MR3420
processor               : 0
cpu model               : MIPS 24Kc V7.4
BogoMIPS                : 266.24
wait instruction        : yes
microsecond timers      : yes
tlb_entries             : 16
extra interrupt vector  : yes
hardware watchpoint     : yes, count: 4, address/irw mask: [0x0000, 0x0220, 0x08c0, 0x0378]
ASEs implemented        : mips16
shadow register sets    : 1
core                    : 0
VCED exceptions         : not available
VCEI exceptions         : not available