This is the best link to explain vlans…
http://forum.mikrotik.com/t/using-routeros-to-vlan-your-network/126489/1
You may have forgotten to add ether1 to the bridge port settings.
/interface bridge port
add bridge=trunk interface=ether3
add bridge=trunk interface=ether1
Bridge vlan settings seem off
so fixing it…
/interface bridge vlan
add bridge=bridge tagged=bridge, ether3, ether1 vlan-ids=103
This supposed that ether1 and ether 3 are going to smart devices (like vlan aware switches or access points).
If instead they were going to dumb devices iike PCs or printers…
then
/interface bridge port
add bridge=trunk interface=ether3 pvid=103
add bridge=trunk interface=ether1 pvid=103
/interface bridge vlan
add bridge=bridge tagged=bridge untagged=ether3,ether1 vlan-ids=103
So what we need is a network diagram to show what devices and ports are in play.
What the heck is LAN doing under dhcp client, REMOVE!!
/ip dhcp-client
add disabled=no interface=LAN
add disabled=no interface=vlan-80
You have almost no firewall rules, I am assuming this device is not connected to the ISP modem but is connected to a router??
And if so, why do you have vlan80 on the wan Side.
This rule makes no sense whatsoever.
/ip firewall nat
add action=masquerade chain=srcnat comment=“Default masquerade”
out-interface-list=all
Are you trying to be a clown on purpose LOL, its a horrible config.
Stick to defaults and all will work.