REPASSAC – 40 minutes ago »
Most ISP’s assign non routable IP address via DHCP, unless your public IP address is a static routable address there would be no way to do this. Even with a static external address you would need to route the packets to the internal address of your Humax.
You could use an ssh tunnel to a server with a public IP address. I use this a lot (in a non Humax context) for making connections at various locations where I have no control over the router but want people to be able to initiate connections from elsewhere.