Lightning Network conf listen & externalip values
Listen: This specifies the interfaces to listen to for incoming connections to your node. This will allow other nodes to establish inbound connections to your lnd node. If you want to listen to all ipv4 connections on port 9735, you can use listen = 0.0.0.0:9735

External IP: Adding an external IP advertises your node to the network. If you'd like to signal to other nodes on the network that you'll accept incoming channels (as peers need to connect inbound to initiate a channel funding workflow), then the externalip flag should be set to your publicly reachable IP address.