[tor-bugs] #4960 [Tor Relay]: Investigate NAT-piercing approaches for relays and bridges

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#4960: Investigate NAT-piercing approaches for relays and bridges
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 Reporter:  karsten    |          Owner:  ioerror                  
     Type:  project    |         Status:  new                      
 Priority:  normal     |      Milestone:  Sponsor F: March 15, 2012
Component:  Tor Relay  |        Version:                           
 Keywords:             |         Parent:                           
   Points:             |   Actualpoints:                           
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 For [wiki:org/sponsors/SponsorF/Year2 sponsor F deliverable 20] we
 promised to "investigate nat piercing approaches for relays / bridges."

 Roger says we have UPnP and NAT-PMP, but it would be great to let relays
 and bridges function behind NATs without doing port forwarding, e.g., by
 UDP tricks or TCP tricks or third-party tricks or something.  There are
 NAT-piercing libraries out there, but most of them are poorly written.
 There are also a bunch of NAT-piercing techniques, some of them are
 probably even good ideas.

 Jake and I agreed that a good first step would be to write a tech report
 that compares the different NAT-piercing options we have.  It could be
 titled "Overview of NAT-piercing approaches for Tor relays and bridges"
 and include UPnP, NAT-PMP, and whatever we come up with.  Jake says he's
 going to write such a tech report.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/4960>
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