AutoNat

[kehiy]

Hi,
About AutoNat, when a private node tries to determine whether it's public or private.
When it sends a packet to a public node when the public node tries to dial it and send the result to the private node the private node NAT also has a 5-tuple and it should work(?).
And if it doesn't, how they send the result to a private node?

[thomaseizinger]

Two things: Our current AutoNAT implementation is (unfortunately by design) a bit flawed because we might accidentally be hole-punching and thus falsely reporting a "no NAT" status. To fix this, there is a V2 currently in the works: libp2p/specs#538

And if it doesn't, how they send the result to a private node?

The node that wants its NAT status figured out dialed the AutoNAT server. This means the server can still open a stream back to the node and report the result of the dial attempt. See the specs for details: https://github.com/libp2p/specs/tree/master/autonat

[kehiy]

So, if it can open a stream back
How does it check whether the node that sends the request is dialable or not?

[thomaseizinger]

The spec explains that in detail! :)

[kehiy]

thanksss