9003

• https://docs.optimism.io/builders/node-operators/configuration/base-config

The default port for the peer-to-peer network is 9003. Is need to open this port on your firewall to receive unsubmitted blocks. For your node to be discoverable, this port must be accessible via both TCP and UDP protocols.

Related

• p2p
• op-node

See also

• op-node [ networks dump-rollup-config ], 9003, rollup.json, op-node logs
• p2p, The Bitcoin P2P Network Library, Libbitcoin, bx, DHT, Bram Cohen, 9003, p2psim, devp2p, Node Discovery Protocol v5