2023-09-15 03:07:24 +00:00
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# For Protocol Developers
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_Documentation for protocol developers._
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This section lists Lighthouse-specific decisions that are not strictly spec'd and may be useful for
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other protocol developers wishing to interact with lighthouse.
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## Custom ENR Fields
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Lighthouse currently uses the following ENR fields:
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### Ethereum Consensus Specified
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| Field | Description |
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| ---- | ---- |
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| `eth2` | The `ENRForkId` in SSZ bytes specifying which fork the node is on |
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| `attnets` | An SSZ bitfield which indicates which of the 64 subnets the node is subscribed to for an extended period of time |
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| `syncnets` | An SSZ bitfield which indicates which of the sync committee subnets the node is subscribed to |
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### Lighthouse Custom Fields
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Lighthouse is currently using the following custom ENR fields.
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| Field | Description |
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| ---- | ---- |
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| `quic` | The UDP port on which the QUIC transport is listening on IPv4 |
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| `quic6` | The UDP port on which the QUIC transport is listening on IPv6 |
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## Custom RPC Messages
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The specification leaves room for implementation-specific errors. Lighthouse uses the following
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custom RPC error messages.
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### Goodbye Reason Codes
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| Code | Message | Description |
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| ---- | ---- | ---- |
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| 128 | Unable to Verify Network | Teku uses this, so we adopted it. It relates to having a fork mismatch |
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| 129 | Too Many Peers | Lighthouse can close a connection because it has reached its peer-limit and pruned excess peers |
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| 250 | Bad Score | The node has been dropped due to having a bad peer score |
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| 251 | Banned | The peer has been banned and disconnected |
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| 252 | Banned IP | The IP the node is connected to us with has been banned |
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### Error Codes
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| Code | Message | Description |
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| ---- | ---- | ---- |
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2023-10-16 05:30:14 +00:00
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| 139 | Rate Limited | The peer has been rate limited so we return this error as a response |
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| 140 | Blobs Not Found For Block | We do not possess the blobs for the requested block |
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