ipld-eth-server/vendor/github.com/btcsuite/btcd/docs/default_ports.md

While btcd is highly configurable when it comes to the network configuration, the following is intended to be a quick reference for the default ports used so port forwarding can be configured as required.

btcd provides a --upnp flag which can be used to automatically map the bitcoin peer-to-peer listening port if your router supports UPnP. If your router does not support UPnP, or you don't wish to use it, please note that only the bitcoin peer-to-peer port should be forwarded unless you specifically want to allow RPC access to your btcd from external sources such as in more advanced network configurations.

Name	Port
Default Bitcoin peer-to-peer port	TCP 8333
Default RPC port	TCP 8334