For those behind a home router an alternative is to use UPNP, e.g., through the miniupnpc package on Debian which ships the `/usr/bin/external-ip` script that p

For those behind a home router an alternative is to use UPNP, e.g., through the miniupnpc package on Debian which ships the `/usr/bin/external-ip` script that postprocesses the `upnpc -s` output.