How do I install the Erigon Network Ports skill?

Run npx skillmds@latest add erigontech/erigon-network-ports in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

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Is Erigon Network Ports free to use?

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Who published Erigon Network Ports?

erigontech (@erigontech) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Erigon Network Ports by erigontech — Agent Skill

Name: Erigon Network Ports
Author: erigontech

File contents

Erigon Port Reference

When running multiple Erigon instances on the same machine, every listening port must be unique per instance. Erigon will fail at startup if any port is already in use, reporting bind: address already in use.

All Ports That Must Be Changed

CLI Flag	Default	Protocol	Description
`--private.api.addr`	`127.0.0.1:9090`	TCP (gRPC)	Internal gRPC API for component communication (txpool, rpcdaemon, sentry, downloader)
`--http.port`	`8545`	TCP	JSON-RPC HTTP server
`--authrpc.port`	`8551`	TCP	Engine API (consensus layer auth RPC)
`--ws.port`	`8546`	TCP	WebSocket RPC server
`--torrent.port`	`42069`	TCP+UDP	BitTorrent protocol for snapshot downloads
`--port`	`30303`	TCP+UDP	DevP2P network listening port (all eth versions multiplexed)
`--caplin.discovery.port`	`4000`	UDP	Caplin consensus DISCV5 discovery
`--caplin.discovery.tcpport`	`4001`	TCP	Caplin consensus DISCV5 TCP
`--sentinel.port`	`7777`	TCP	Sentinel (consensus p2p service)
`--beacon.api.port`	`5555`	TCP	Beacon Chain REST API
`--mcp.port`	`8553`	TCP	MCP (Model Context Protocol) RPC server

Conditional Ports (only if enabled)

CLI Flag	Default	Protocol	Description
`--pprof.port`	`6060`	TCP	Go pprof profiling HTTP server (requires `--pprof`)
`--metrics.port`	`6061`	TCP	Prometheus metrics HTTP server (requires `--metrics`)

Example: Two Instances

Instance 1 (using defaults):

./build/bin/erigon --datadir /path/to/datadir1

Instance 2 (all ports offset by +100):

./build/bin/erigon --datadir /path/to/datadir2 \
  --private.api.addr=127.0.0.1:9190 \
  --http.port=8645 \
  --authrpc.port=8651 \
  --ws.port=8646 \
  --torrent.port=42169 \
  --port=30403 \
  --caplin.discovery.port=4100 \
  --caplin.discovery.tcpport=4101 \
  --sentinel.port=7877 \
  --beacon.api.port=5655 \
  --mcp.port=8653

Notes

--private.api.addr takes a full host:port value, not just a port number.
The torrent port binds on both TCP and UDP; it is typically the first port conflict encountered at startup.
If --pprof or --metrics are enabled on both instances, their ports must also differ.

---name: erigon-network-portsdescription: Reference for all Erigon network ports. Use this when running multiple Erigon instances to avoid port conflicts. Lists every CLI flag that binds a port, its default value, and the protocol used.---# Erigon Port ReferenceWhen running multiple Erigon instances on the same machine, every listening port must be unique per instance. Erigon will fail at startup if any port is already in use, reporting `bind: address already in use`.## All Ports That Must Be Changed| CLI Flag | Default | Protocol | Description ||----------|---------|----------|-------------|| `--private.api.addr` | `127.0.0.1:9090` | TCP (gRPC) | Internal gRPC API for component communication (txpool, rpcdaemon, sentry, downloader) || `--http.port` | `8545` | TCP | JSON-RPC HTTP server || `--authrpc.port` | `8551` | TCP | Engine API (consensus layer auth RPC) || `--ws.port` | `8546` | TCP | WebSocket RPC server || `--torrent.port` | `42069` | TCP+UDP | BitTorrent protocol for snapshot downloads || `--port` | `30303` | TCP+UDP | DevP2P network listening port (all eth versions multiplexed) || `--caplin.discovery.port` | `4000` | UDP | Caplin consensus DISCV5 discovery || `--caplin.discovery.tcpport` | `4001` | TCP | Caplin consensus DISCV5 TCP || `--sentinel.port` | `7777` | TCP | Sentinel (consensus p2p service) || `--beacon.api.port` | `5555` | TCP | Beacon Chain REST API || `--mcp.port` | `8553` | TCP | MCP (Model Context Protocol) RPC server |### Conditional Ports (only if enabled)| CLI Flag | Default | Protocol | Description ||----------|---------|----------|-------------|| `--pprof.port` | `6060` | TCP | Go pprof profiling HTTP server (requires `--pprof`) || `--metrics.port` | `6061` | TCP | Prometheus metrics HTTP server (requires `--metrics`) |## Example: Two InstancesInstance 1 (using defaults):```bash./build/bin/erigon --datadir /path/to/datadir1```Instance 2 (all ports offset by +100):```bash./build/bin/erigon --datadir /path/to/datadir2 \ --private.api.addr=127.0.0.1:9190 \ --http.port=8645 \ --authrpc.port=8651 \ --ws.port=8646 \ --torrent.port=42169 \ --port=30403 \ --caplin.discovery.port=4100 \ --caplin.discovery.tcpport=4101 \ --sentinel.port=7877 \ --beacon.api.port=5655 \ --mcp.port=8653```## Notes- `--private.api.addr` takes a full `host:port` value, not just a port number.- The torrent port binds on both TCP and UDP; it is typically the first port conflict encountered at startup.- If `--pprof` or `--metrics` are enabled on both instances, their ports must also differ.

Frequently asked questions

Erigon Network Ports