Openwrt VLAN + L2 or L3 additional router

[psherman]

Thanks @elder_tinkerer for the shoutout...

I actually have a more in-depth description about the unpredictability of unmanaged switches here:

How to setup VLANs on an R7800

The answer is not entirely straight forward, unfortunately. The short answer is: Don't put any tagged networks through an unmanaged switch. The longer answer is a bit more complex. Basically, unmanaged switches are not designed to carry tagged networks. This means that the behavior is undefined and may be different from swtich to switch (brand/model or even version of any given model). You may find the following types of situations, depending on the switch in use (generally it would be just …