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feat: add NAT hole punching protocol and relay v2 reservation renewal & multi-hop support #782

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feat: add NAT hole punching protocol and relay v2 reservation renewal & multi-hop support #782

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sujalsalekar
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1. NAT Traversal and Hole Punching

  • Adds a new HolePunchService implementing the /libp2p/holepunch/1.0.0 protocol.
  • Lays the groundwork for advanced NAT traversal, enabling peers behind NATs to establish direct connections using coordinated hole punching.
  • The service is ready for integration with AutoNAT and relay-based coordination.

2. Relay v2 Upgrades

  • Implements client-side reservation storage and automatic renewal in CircuitV2Transport, ensuring relay reservations are refreshed before expiration.
  • Adds support for multi-hop relays, allowing connections to be established through a chain of relay nodes when direct or single-hop relay connections are not possible.
  • Updates relay selection and dialing logic to handle multi-hop relay addresses.

@seetadev
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seetadev commented Jul 20, 2025 •
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@sujalsalekar : HI Sujal. Wish if you could discuss with @Winter-Soren before proceeding on this PR. We do have another PR ready to be merged: please visit #668

It would be better if you discuss, work out a plan and contribute with @Winter-Soren in hole punching interop.

It would be wonderful if you could also meet us at maintainer meetings or at discord before picking up the issue.

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@sujalsalekar @seetadev