I used DCC for years behind NAT, just forwarded a port range and configured my client to always use that port range. It takes a minute to set up, but then it's

I used DCC for years behind NAT, just forwarded a port range and configured my client to always use that port range. It takes a minute to set up, but then it's seamless. I have UPNP turned off, but can't it do similar, automatically?