Port transmission via IPv6

Let us imagine that I contact Google’s customer service to access one of my Smart Home devices, which is connected to my local network. The staff member is going to send an IPv6 request to the global IPv6 address of my device. The request will make a stop on my router. The router’s firewall will prove, wheter the package of the request should be transmitted to my end device. Due to the fact, that this request didn’t go out of my router, its firewall will ignore this request. Thus, the IP package won’t reach my end device.

I need a port transmission to let the staff member accessing my end device. I have to open the graphical interface of my router and declare a port filter:

Source address: global IPv6 address of the customer service

Destination address: global IPv6 address of my Smart Home device

Source port: random

Destination port: addressing the application of my end device (for example: 342)

__

By declaring that port filter I say to my router: Dear router, when a request should reach port 342 of my Smart Home device, let this request go to my device.