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ericbrown99 merged 1 commit into from
Jan 15, 2026
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docs: add networking section with reth discv5 port callout #826

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13 changes: 13 additions & 0 deletions docs/base-chain/node-operators/run-a-base-node.mdx
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Expand Up @@ -43,6 +43,19 @@ If utilizing Amazon Elastic Block Store (EBS), ensure timing buffered disk reads
</Note>


### Networking

Ensure the following ports are accessible (not blocked by firewall) for peer discovery and sync:

| Port | Protocol | Purpose |
|------|----------|---------|
| `30303` | TCP/UDP | P2P Discovery (discv4) & RLPx |
| `9222` | TCP/UDP | Reth Discovery v5 (discv5) |

<Note>
Port `9222` is critical for Reth peer discovery. If this port is blocked, your node may have difficulty finding peers and syncing.
</Note>

### Docker

This tutorial assumes you are familiar with [Docker](https://www.docker.com/) and have it running on your machine.
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2 changes: 1 addition & 1 deletion docs/base-chain/node-operators/troubleshooting.mdx
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Expand Up @@ -107,7 +107,7 @@ Refer to the [Snapshots](/base-chain/node-operators/snapshots) guide for the cor
- **Check**: Are the `--http.addr` and `--ws.addr` flags set to `0.0.0.0` in the client config/entrypoint to allow external connections (within the Docker network)?

- **Issue**: Node has low peer count.
- **Check**: P2P port (default `30303`) accessibility. Is it blocked by a firewall on the host or network?
- **Check**: P2P port accessibility. Ensure `30303` (TCP/UDP) and `9222` (TCP/UDP for Reth discv5) are not blocked by a firewall on the host or network.
- **Check**: Node logs for P2P errors.
- **Action**: If behind NAT, configure the `--nat=extip:<your-ip>` flag via `ADDITIONAL_ARGS` in the `.env` file (see [Advanced Configuration](/base-chain/node-operators/run-a-base-node#improving-peer-connectivity)).

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