On my LAN all nodes have public, fixed IP addresses, so as far as each computer's built-in firewall and/or the pfSense box allows, each one can access any other one regardless where it's located by a fixed IP address or FQDN.
This of course falls apart, as soon as a machine leaves the LAN, and that I try to prevent.
The one big thing that the Internet still has that's rather outdated is the geo-IP stuff, when in fact global roaming of any given IP address should be possible (just like a moble phone can be anywhere in the world and still be reachable by the same number).
So the goal is, to destroy the geo-location dependence of in practice a few, conceptually of all, my computers' IP addresses while retaining the ability to reach all of them by the same fixed IP address from any public network, regardless where they are located.
I'd like to end up with a logical environment that's largely independent from the physical location. e.g. an rsync script shouldn't have to know where a computer is. It should only need to know its public IP address and/or FQDN, and start working, as long as the host is reachable (if the laptop is sleeping in an airplane, it won't be reachable, but it shouldn't matter if it's set up in a hotel in Nairobi, a coffee shop half a mail away from the office, or in orbit on a space station: if there's internet connectivity, it should be reachable by the same address and FQDN.
Due to the boneheadedness of Verizon, I was already forced to virtualize my entire LAN by routing the public IP addresses over a VPN link to where I am, which means theoretically I could go traveling around the world with the entire LAN, IP addresses and FQDN's remaining invariant. So now I'd like to extend that concept to individual machines.
Bridging would be just fine, if somehow I could filter the broadcast traffic…
On a fast internet connection, the amount of broadcast traffic wouldn't be an issue, because there are not that many machines involved, and the net is generally fairly quiet, but traveling one doesn't always have a fast connection, and then broadcast traffic can quickly get deadly... (think GPRS link to the internet...)