* A representation of the encapsulation of packets in UDP-over-IP.
* This is encapsulation only, there is no tunnel interface, hence
* it is uni-directional. For decap register a handler with the UDP port
* A representation of the encapsulation of packets in UDP-over-IP.
* This is encapsulation only, there is no tunnel interface, hence
* it is uni-directional. For decap register a handler with the UDP port