TL;DR: Bridged ASDL modem over VLAN – yes it can work!

The problem:
x86 Router (Endian) has run out of physical network cards, but more WAN ports are required, can we do something with a ‘Router on a stick’ and use a VLAN aware Switch?

We can do this in a ‘double NAT’ style configuration, but can we do it in a bridged mode configuration. It seems that we can in fact. However I’m using a L3 switch (Dell 6248) I have tired in the past to use a HP PS1810-8G Switch (J9833A) without successful (granted I didn’t spend too much time on it).