Hey everyone,
I had something peculiar happen a while back when I tried to bridge two vlans together in an LXC container and later a VM. As far as I understand it, L2 bridging between vlans should be perfectly fine as long as there isn’t a router or competing broadcast service like DHCP that would cause issues. I did it with my vlan 40, which is my standard devices network, and vlan 310, which only exists on the switches and didn’t have anything else on it. When I bridged these two it seemed as though I caused a broadcast storm but that shouldn’t have been the case. (It may have been caused by the fact my router is virtualized on the same host that I did this on, but it still shouldn’t have had this effect.) The goal that I had with this was to create a “VWire”/L2 firewall so I can monitor and block traffic at layer 2 to be a transparent firewall to see if I could replicate the functionality of PaloAltos vwire. I’m not fully sure what happened and testing seems to crash the entire network so I’d like to get a handle on what’s actually happening. I’m posting here as well so see if anyone had linux bridging experience.
For some more information like configurations: