Cisco 1841 VLAN on WAN interface?

Question

Cisco

Good afternoon, colleagues!
Input data: There is a provider that gives the Internet via VLAN 106. There is Zyxel Keenetic, on which it is elementary to register VLAN on the WAN port through the web interface. There was a need to replace Zyxel with Cisco 1841.
Question: how to register vlan on Cisco 1841 ios 12.x on the fa0 / 0 interface?
My solution, which did not start:
interface FastEthernet0/0
description WAN_0
no ip address
duplex auto
speed auto
!
interface FastEthernet0/0.106
description WAN_1
encapsulation dot1Q 106
ip address xxxx 255.255.255.128
ip nat outside
ip virtual-reassembly

Answer 1

The option is correct and should work.
Perhaps the provider has a binding to the MAC address of the equipment, that is, on FastEthernet0 / 0 you need to fake the MAC of your former Zyxel-type piece of iron using the method

configure terminal
interface FastEthernet0/0
mac-address aaaa.bbbb.cccc

Or use the services of operator support for the legalization of MAC cats.

Answer 2

What exactly didn't work? The MAC address of the provider's piece of iron is visible sh mac-address-table | i FastEthernet0/0