Linux - NetworkingThis forum is for any issue related to networks or networking.
Routing, network cards, OSI, etc. Anything is fair game.
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Stunnel, netcat, socat, but they are more useful for specific ports, I don't think any have an option for using tap/tun. Ssh can do either, portforwarding or using tap/tun interfaces. I have to admit I'm really curious why any of the other ones wouldn't work for you. If its a matter of a protocol inspecting firewall between the two then I'd go with ssh over https.
ssh can setup a vpn using the tap/tun interface with the -w option and the Tunnel config option. I usually set the Tunnel config option to ethernet so it creates a tap interface which is the equivalent of a normal ethernet interface. Then you just ssh -w any user@remote_machine (might want to add -f -N -n)
It results in a pair of interfaces, one on each machine that are connected to one another like the two machines were on the same lan. If you use the tap interface option then just set up your ips and routes or bridge the interface.