How many relay nodes are there in the ipfs network? How can I become a relay node?

specs/autonat at master · libp2p/specs (github.com)

In order to prevent attacks like the one described in RFC 3489, Section 12.1.1 (see excerpt below), implementations MUST NOT dial any multiaddress unless it is based on the IP address the requesting node is observed as. This restriction as well implies that implementations MUST NOT accept dial requests via relayed connections as one can not validate the IP address of the requesting node.

How many relay nodes are there in the ipfs network? How can I become a relay node?

More background here:

and

As of Kubo 0.13, circuit relay v2 is enabled by default: https://github.com/ipfs/kubo/releases/tag/v0.13.0

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