Please note that you have to use the nvi to edit files on the flash device from the FRITZ!Box, cause all files there are marked as non regular. var/media/ftp/FLASH-DISK-01/addons/startup.sh The content looks like the following: # execute the start script which is on the usb stick #Fritzbox telnet deletebyindex upgradeThis makes sure that even after a firmware upgrade our changes are not lost. We will use it only to start a script which is located on the usbstick. Its executed on every boot after all the other services are started. The initial starting point for all modifications on the FRITZ!Box is a file called /var/flash/debug.cfg. You have to note the part between root: and the next colon. #Fritzbox telnet deletebyindex passwordWe have to create one and save the password hash for later usage. The FRITZ!Box has initial no root password entry. cd /var/media/ftp/FLASH-DISK-01/addonsĭropbear/bin/dropbearkey -t rsa -f dropbear/etc/sshd_rsa_host_key Now we will create a host key which will be reused even after a reboot of the FRITZ!Box. #Fritzbox telnet deletebyindex softwareIn my case the software is installed into /var/media/ftp/FLASH-DISK-01/addons. cd /var/tmpĪfter downloading, the server has to be installed on the usbstick by executing. You can get a prepared version for the FRITZ!Box from the spblinux server. Installation and configuration of the ssh serverįor the ssh server software dropbear is used. Time to connect to the FRITZ!Box for the first time. In principle the size doesn’t matter, around 5 MBytes free space should be enough. Now you need a usbstick where all the software will be installed on and which have to be connected to the FRITZ!Box all the time. To disable the telnet daemon later you call #96*8*. Enabling telnet is as simple as calling #96*7* with a local connected phone. Next you need telnet access to the FRITZ!Box to make the initial configuration for the ssh server. This will allow you to connect to your FRITZ!Box without knowing the IP after a reconnect. You can then add this information to the “DynamicDNS” tab of the Internet settings in the FRITZ!Box web frontend. Preparing the FRITZ!Boxįirst of all you should register an account at or any other service for dynamic IP resolution. After all making a backup of your current configuration might be a good idea. Also I’m not responsible for anything happen to your FRITZ!Box or the Internet connection. So there is no warranty of any kind if you do some of the things mentioned in this blog. Before we start some words of caution: It’s easily possible to render the FRITZ!Box unusable. So thanks to all the people for sharing this kind of information. #Fritzbox telnet deletebyindex seriesMainly this are some forum entries at, the series about the FRITZ!Box at, the posts on, the blog at and this article at. All the information in this and the following posts are based on several websites I found in the Internet. So if you aren’t in touch with Linux or start asking what the hell is vi and how get I out of it, stop reading now. The following topics are all for advanced user. Other firmware versions may work also, but I haven’t tested that. As I said the hardware used is a FRITZ!Box Fon WLAN 7270 with the firmware 54/74.04.80 from 5 which is an official one from AVM. Following this post, some articles about how you can turn the FRITZ!Box into a OpenVPN server and how you can use the VoIP access point remotely from any computer having a VoIP software installed, will be done. In this post I will explain how you get access to your FRITZ!Box using ssh. As I always try to maximize the usage of new hardware I started to explore what is possible with this combination. Additionally to this you can order a FRITZ!Box 7270 which allows you to use VoIP for the phone part. You get 32 MBit in the download direction and 2 Mbit in the upload direction. Recently I changed my Internet service provider to Kabel Deutschland which offers some really good bandwidth for a reasonable price.
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