Have 1 Fritz boxes (Fritz! Box WLAN 3270) as a 3G router in use with an O2 USB Modem, runs great.
Another 3270 as a WLAN access point behind a Vodafone EasyBox as the internal WLAN of Easybox had only problems with me.
Now we have a branch office to get in even in this day and age, of course, should be an internet connection. So fare booked with cable Germany and few days later received the modem. This joined work right away, signed up in the portal and the unit switched to the bridge mode (so that the Fritzbox gets assigned a private IP from the modem but the public IP of the network to also be accessible from the outside). Fritzbox on LAN port appended 1 and lo and behold after a restart of both units the Fritz box had the public IPv4 address.
MyFRITZ the service I've then also activated a "Dyndns" address to receive from outside, (being carried out at KD actually eh has a fixed IP address, but better safe than sorry).
DC ran to configure the Fritz box, with the Wi-Fi to change access, etc.
VPN access between two boxes Fritz (FRITZ! Box Fon WLAN 7390 and 3370).
The wizard guides you through the configuration through a simple, password assign the address of the other Fritzbox entered and even changed the internal IP addresses to get a different address range (By default, the Fritzbox yes furnished with the address range 192.168.178.x. So hab I the second Fritz box were previously eh still connected to the same device no rimmed on 192.168.179.x.
VPN connection will be constantly maintained, but you can adjust that this is set up only when accessed.
So now, the Überwachungscam take the pictures (in my opinion) securely on the Company Internal NAS.
Also, on the remote computer simply the network drives to be set up without having to use the Web Access size previously.
Now a USB stick is connected to the Fritz box still night and additionally a backup of the NAS performed as a backup for important data. This I can easily configure on my NAS.
Furthermore, also software on the remote Fritzbox on the USB stick to copy as night the utilization of the Internet will not affect the operation has.
As I said am convinced of AVM, once also had a faulty a device that is not always addressed in turn, only all LEDs have faintly lit, but is not booted.
Submitted problem described device and a short time get it a replacement unit. Without a botch or beep. And after more than 3 years ....