Troubleshooting Hole Punching Issues

[cosmikwolf]

I am trying to set up hole punching from one laptop on my home network, using a cloud server in a VPS I control as the relay, and trying to connect to another laptop on my same home network.

I am hitting an error where libp2p is unable to dial to the listener. These seem to be the more pertinent error lines:

[2023-02-12T22:08:57Z DEBUG libp2p_core::upgrade::apply] Successfully applied negotiated protocol
[2023-02-12T22:08:57Z INFO  dcutr] Received { peer_id: PeerId("12D3KooWPjceQrSwdWXPyLLeABRXmuqt69Rg3sBYbU1Nft9HyQ6X"), info: Info { public_key: Ed25519(PublicKey(compressed): cecc157dc1ddd7295951c29888f095adb944d1b73d696e6df65d683bd4fc), protocol_version: "/TODO/0.0.1", agent_version: "rust-libp2p/0.41.0", listen_addrs: ["/ip4/y.y.y.y/tcp/59664", "/ip4/x.x.x.x/tcp/4008/p2p/12D3KooWDpJ7As7BWAwRMfu1VU2WCqNjvq387JEYKDBj4kx6nXTN/p2p-circuit/p2p/12D3KooWPjceQrSwdWXPyLLeABRXmuqt69Rg3sBYbU1Nft9HyQ6X", "/ip4/x.x.x.x/tcp/4008/p2p/12D3KooWDpJ7As7BWAwRMfu1VU2WCqNjvq387JEYKDBj4kx6nXTN/p2p-circuit/p2p/12D3KooWPjceQrSwdWXPyLLeABRXmuqt69Rg3sBYbU1Nft9HyQ6X", "/ip4/127.0.0.1/tcp/59664", "/ip4/192.168.50.16/tcp/59664"], protocols: ["/libp2p/circuit/relay/0.2.0/stop", "/ipfs/ping/1.0.0", "/ipfs/id/1.0.0", "/ipfs/id/push/1.0.0", "/libp2p/dcutr"], observed_addr: "/p2p/12D3KooWDpJ7As7BWAwRMfu1VU2WCqNjvq387JEYKDBj4kx6nXTN" } }
[2023-02-12T22:08:57Z INFO  dcutr] RemoteInitiatedDirectConnectionUpgrade { remote_peer_id: PeerId("12D3KooWPjceQrSwdWXPyLLeABRXmuqt69Rg3sBYbU1Nft9HyQ6X"), remote_relayed_addr: "/ip4/x.x.x.x/tcp/4008/p2p/12D3KooWDpJ7As7BWAwRMfu1VU2WCqNjvq387JEYKDBj4kx6nXTN/p2p-circuit/p2p/12D3KooWPjceQrSwdWXPyLLeABRXmuqt69Rg3sBYbU1Nft9HyQ6X" }
[2023-02-12T22:08:57Z DEBUG libp2p_dns] Dialing /ip4/y.y.y.y/tcp/59664/p2p/12D3KooWPjceQrSwdWXPyLLeABRXmuqt69Rg3sBYbU1Nft9HyQ6X
[2023-02-12T22:08:57Z DEBUG libp2p_tcp] dialing y.y.y.y:59664

and these are the debug logs for dial and listen, but the relay_v2 server debug log had way too much noise so it is just the info log
https://gist.github.com/cosmikwolf/1789d708c428140972806627185daafd

while it seems to be a TCP error, I am not entirely sure what else to look for. Trying to get wireshark set up, but I am having some issues capturing traffic, so I figured it would be good to see if anyone had any tips on how to troubleshoot failed hole punch scenarios? Anything to look for on my router?

[thomaseizinger]

Does it continuously fail? i.e. even if you try multiple times in a row?

Our hole punch success rate isn't quite as high as we'd like unfortunately. There are some optimizations to be done.