In order to help a device from your home network to help the Internet, port forwarding is often required. Either: Forward ports.
Your home network is - if it's right - completely separated by your router from the internet. Logical too, because otherwise the whole world could be around you on your NAS or computer. Or use your printer at any time to print anything. The router's Firewall co-operates with some other separation techniques. So great, but it will be a problem if you want to make a device available online now. In that case, you must review specific issues. That is set in the router.
What is a gate?
A port is basically nothing but an access to a particular service that has a network device on offer. For example, if your NAS has a web interface, a specific port is used for that. For example - like at Synology - port 5000. But it can also be something very different. Other services such as FTP (for transferring files) or SSH (terminal service) also know their own ports. Gates are thus an addition to the IP address (or home address) of a network device. For example, a NAS at address 192.168.1.140 may use the 5000, 80, 21 ports for certain services. And that everything is kept indoors by your router.
To get to your NAS or any other device via the internet, you must open the address and the ports. Keep in mind that from then on, the entire world can actually be at your NAS via the IP address you received from your carrier! One major problem is that forwarding ports at each brand and type works differently. Often you will find the possibility under Port Forwarding, or - as with the Fritz! Box - under the Internet and then Permit Access. With an UPC router, you can find the option under Advanced and Forwarding. What matters is that in the first column you enter the port (or port range) to be sent. In the second column, type the address of the device in question, for example, an NAS at 192.168.1.140. Preferably, choose both as a protocol. Click Save and the new forwarding rule has been created. From that moment you can access the NAS via the internet. To do this, type in the internet IP address (WAN address) that you received from your carrier. If you do not know that, you can easily find that by visiting this site , for example. In the case of Synology, type http: // xxxx: 5000 to open the web interface. Where xxxx is the IP address you just retrieved, or the internet address of your internet connection.
Note: In order to actually check if it works, it is useful to walk past the neighbors and access their newly locked device on their computer. Or use a mobile phone that is not connected to your home network via Wi-Fi, but connected to 3G or 4G. If you are connecting to the Internet via a computer from your home network with a device that depends on your IP address, that is not always good.
Finally, a practical problem: If you have hung your router behind your router, you must double-forward port forwarding. First on your own router, where you (for example) pass the NAS in the just described way. And then again in your carrier router. You must then complete the address of your router at all ports. Somewhat complicated indeed, but necessary. That looks like below. And hopefully, finally, be sure to take care of very strong passwords on all devices on the public Internet!