swarm: implement NAT piercing

[attila-lendvai]

Many nodes will be behind NAT, and it would be nice to be able to connect to them by piercing through the NAT.

ipfs

ipfs is using libp2p.

• go libp2p status (2018-04)

tor

• ticket for NAT piercing
• tech report

[karalabe]

We already have support for UPnP. I know of one place where Ubuntu firewall blocks it, but generally it kind of works. Anything in particular you are referring to with this issue?

[attila-lendvai]

@karalabe this is about dealing with network setups where UPnP is not available, and/or making the network code simpler at the same time by using something like libp2p.

i created this ticket based on a discussion with @zelig , maybe he can chime in.

[zelig]

libp2p issues https://github.com/ethereum/go-ethereum/pulls?utf8=%E2%9C%93&q=is%3Apr++label%3Aarea%3Alibp2p+

The question is how much bang for the buck.
i would not put this too high priority

[nonsense]

Let's continue this discussion at ethersphere/swarm because this is opened in the context of Swarm, and doesn't refer to a known bug/issue with Geth.