echoip

Small TCP server that echoes the client IP

Why? I needed a way to test our NAT configuration. We have a setup where outgoing connections can bind to a local ip:port to choose what is going to be the external IP.

Usage

Start the server somewhere outside your LAN

$ echoip -b 0.0.0.0:8001

within you LAN connect to it specifying a local ip and port

$ nc -s 192.168.100.17 -p 9001 igorsobreira.com 8081

the response will be the external IP your connection used, so you can verify if your NAT configuration is correct.

Installing

Just download one the binaries from bin/