This section provides essential information about the ports used by the system, their primary purposes, and recommendations for exposure settings.

Peering Ports

  • Port: 30303
  • Protocol: TCP and UDP
  • Purpose: Peering with other nodes for synchronization of blockchain data. Nodes communicate through this port to maintain network consensus and share updated information.
  • Exposure Recommendation: This port should be exposed to enable seamless interaction and synchronization with other nodes in the network.

Metrics Port

  • Port: 9001
  • Protocol: TCP
  • Purpose: This port is designated for serving metrics related to the system's performance and operation. It allows internal monitoring and data collection for analysis.
  • Exposure Recommendation: By default, this port should not be exposed to the public. It is intended for internal monitoring and analysis purposes.


  • Port: 8545
  • Protocol: TCP
  • Purpose: Port 8545 provides an HTTP-based Remote Procedure Call (RPC) interface. It enables external applications to interact with the blockchain by sending requests over HTTP.
  • Exposure Recommendation: Similar to the metrics port, exposing this port to the public is not recommended by default due to security considerations.


  • Port: 8546
  • Protocol: TCP
  • Purpose: Port 8546 offers a WebSocket-based Remote Procedure Call (RPC) interface. It allows real-time communication between external applications and the blockchain.
  • Exposure Recommendation: As with the HTTP RPC port, the WS RPC port should not be exposed by default for security reasons.

Engine API Port

  • Port: 8551
  • Protocol: TCP
  • Purpose: Port 8551 facilitates communication between specific components, such as "reth" and "CL" (assuming their definitions are understood within the context of the system). It enables essential internal processes.
  • Exposure Recommendation: This port is not meant to be exposed to the public by default. It should be reserved for internal communication between vital components of the system.