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Here is what my /etc/network/interfaces file would look like if I weren't using vlans and instead had two ethernet cards plugged into an internal and external facing switch. # network interface settings...

Sorry I wasn't more clear. If you don't have a switch capable of separating internal from external traffic (ie vlan aware) you will need separate switches for each if you intend to be able to move your firewall virtual machine from one host to the other seamlessly.

I described my setup in some detail here for another user who was trying to do what you are asking. In short I use two bridges and also utilize vlans but the concept isn't dependant on using vlans. If you are using pfsense for instance, you could setup an HA pair using the basic design I am...

I had the same thing happen during the last round of upgrades. I ended up accepting the downtime for core services while the last node upgraded rebooted. Once all nodes were on the latest version I could again migrate machines while still online.

Like this https://linuxconfig.org/configuring-virtual-network-interfaces-in-linux ?

I have the exact configuration you are trying to setup. My setup connects from a cable modem to a smart switch that is vlan aware. I have an internal vlan setup and an internet vlan. The cable modem port is an untagged internet vlan port. Each proxmox server receives the internal network...