We have two Cisco 2801 that connects two offices.
We where running the traffic over serial interface but now we got a new provider of the comunication line. They could only deliver a line with TCP/IP so we had to change to fast ethernet on both routers.
They say that we have to tag the native VLAN 1 traffic over the line.
Must we use Trunks or Subinterfaces or what?
We have tried to change the configuration with no success.
How do we set this up correctly ?
The cisco 2801 is running 12.4(16a).