> Behind the NAT it just isn't possible. It could be with UPnP, which as a security conscious person you likely have disabled. Do you trust it staying disabled

> Behind the NAT it just isn't possible. It could be with UPnP, which as a security conscious person you likely have disabled. Do you trust it staying disabled or none of your many devices trying to use it to poke holes in the NAT? Even if you have to use your ISPs modem/router device, it might have a bridge mode where it just becomes a modem, enabling you to use your own router. It might be worth checking this option if you didn't already.