I have Shibby tomato-RT-N66U_RT-AC6x--116-AIO-64K on an RT-N66R. I am trying to configure physical port 1 as a trunked port to support the native VLAN and a trunked VLAN (VLANID 15) for a guest network. I have created this configuration on two E4200 with the same version of Shibby and it's working just fine. I have gone over my configuration with a fine toothed comb and I can't see what I've done wrong on the N66R. In all of these configurations, the E4200 and the N66R are being configured as simple APs. The DHCP/routing, etc, is being handled by a dedicated router. I installed tomato-RT-N66U_RT-AC6x--116-AIO-64K and immediately did a clear NVRAM. I created a bridge, br1 with an IP address on the trunked network. Then I went to the Advanced tab and added the VLAN ID 15 to port 1 as a tagged port, and then of course it made be tag VLAN 1 as well. I then clicked the VLAN experimental box. I then created WL0.1 and attached it to BR1. I made sure everything was saved and rebooted. Tried to ping the bridge and no response. Rechecked everything, verified the config against one of my E4200, and they appear identical. I dumped the NVRAM config and compared them, and they seem identical as well. The one difference I noted is that on the working E4200, vlan_trunk_so=1 and it's not on the N66R. What does this setting do? And what triggers setting it to 1?