UDP and NAT

[Albi Rebmann]

> Actual status:
> Network A has a public IP
> Network B is behind a provider-scale NAT.
>
> Actually I'm using openvpn with a single UDP connection from B to A, and
> hosts inside Network A can communicate with B.
>
> I tried with tinc, and I saw tinc has to go TCP-Only for accomplish
> this. This is because Tinc can't reutilize incoming UDP connections to
> reply back - has to set up an outgoing udp connection defined in config
> (thing that in a NAT-ed environment isn't possible)

Network A has a public IP, does this mean a server (with tinc) has direct
public IP, no NAT? Then UDP should be no problem if you connect from B to
A. Only A to B connectiions will work with TCP. Just connect from B to A
and all will be fine.


ALBI...