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BOLT 1: adds remote address to optional init_tlvs (IP discovery) #917

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Jan 17, 2022
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BOLT 1: adds remote address to optional init_tlvs (IP discovery) #917

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9 changes: 9 additions & 0 deletions 01-messaging.md
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Original file line number Diff line number Diff line change
Expand Up @@ -265,8 +265,12 @@ The `features` field MUST be padded to bytes with 0s.
2. data:
* [`...*chain_hash`:`chains`]

1. type: 3 (`remote_addr`)
2. data:
* `address descriptor` (1 byte type and data, see BOLT 7)

The optional `networks` indicates the chains the node is interested in.
The optional `remote_addr` can be used to circumvent NAT issues.

#### Requirements

Expand All @@ -277,6 +281,10 @@ The sending node:
- SHOULD NOT set features greater than 13 in `globalfeatures`.
- SHOULD use the minimum length required to represent the `features` field.
- SHOULD set `networks` to all chains it will gossip or open channels for.
- SHOULD set `remote_addr` to reflect the remote IP address (and port) of an
incoming connection, if the node is the receiver and the connection was done
via IP.
- SHOULD NOT set private addresses as `remote_addr`.

The receiving node:
- MUST wait to receive `init` before sending any other messages.
Expand All @@ -290,6 +298,7 @@ The receiving node:
- MAY close the connection.
- if the feature vector does not set all known, transitive dependencies:
- MUST close the connection.
- MAY use the `remote_addr` to update its `node_annoucement`

#### Rationale

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