(optional) Find out your randomly assigned I2P port by typing: `router/bin/tunnel-control.sh router.externalPort`. For privacy reasons, do not disclose this port number to other people. Tell your firewall to forward traffic through to this port so that your I2P node is publicly reachable. If you have no ability to allow incoming connections, everything will still work, but your I2P node will not be helping the I2P network as much as it could.