[Tech] Proposal: UP&P

[Matthew Toseland]

Universal Plug and Play support
===============================

I suggest that we need UP&P support. The main caveats are that it is not
usable on an untrusted LAN, so we need to ask the user, and that we may
not easily be able to distinguish between a local trusted LAN and an
ISP's LAN. It is also reported that UP&P works only around 50% of the
time when it is detected.

However:
- It would significantly improve connection reliability. If for example
  all your peers are german and in germany all domestic IPs change every
  24 hours, if you are down for 24 hours you are lost for good.
- Right now good connectivity relies on getting a few geek nodes - nodes
  that are directly connected or port forwarded. UP&P would increase the
  proportion of such nodes dramatically.
- It would allow for all sorts of bootstrapping protocols. One-time
  references are the tip of the iceberg: Anything that involves giving
  your details well in advance of the actual connection attempt will be
  greatly helped by UP&P support.
- It would (mostly) eliminate the need to rely on centralised STUN servers.
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