IP changes when device restarts
 

Hi!
I have worked with the 8.6 Linux Debian distribution on a device called BeagleBone Black (also called BBB), in which I need to set up a fixed IP. I already managed to set up, but when the BBB is restarted, the IP goes back to the old number.

I am doing this:

1- Connect the BBB physically to the router;
2 - I verified by the router which dynamic IP the BBB got and then access as root user via SSH in a terminal (like Putty);
3- I edit the file "/etc/network/interfaces" and enter the information I need, like this:
4- I edit the file "/etc/resolv.conf" and change the "nameserver" to "nameserver 192.168.0.1" (this is the IP of my router)
5- After this I reboot the network: /etc/init.d/networking restart

So far so good! I can access the BBB through the new IP 192.168.0.15 (this is the IP that I chose).

THE PROBLEMS ARE:
When the BBB is turned OFF and ON again, this occurs:
A) The BBB again picks up a dynamic IP from the router;
B) The file "/etc/resolv.conf" returns to its original configuration, which is "nameserver 127.0.0.1".

The file "/etc/network/interfaces" remains with the information I put in, but it's as if it has no effect.

I have already verified a lot of information about the same problems, but maybe because of my lack of knowledge I was unable to solve the problem, although I have tried several alternatives.

I need this IP to stay fixed. I need to turn OFF the BBB, disconnect from the router and connect via CROSS cable to my laptop.

Does anyone have an idea how to solve it?

Is that your entire working file, or are there some other active entries present?

A bit more searching and I've found references (concerning Debian Jessie) that suggest configuring /etc/dhcpcd.conf instead.

For example
https://nebulousthinking.wordpress.c...essie-in-2016/

Another example of this..
http://superuser.com/questions/54711...pcd-still-runs

ferrari,
there is no "dhcpcd.conf" file at this Linux Debian distribution.
So the two examples you indicated do not solve the problem in this case.
PS: I have very little knowledge about Linux, so if you have a little more patience and help me a bit more, I would be very grateful!

SOLUTION:

It had nothing to do with anything that was quoted. It occurs in Debian Linux, of several versions (mine is Jessie 8.6), there is a connection management package that overwrites some information and simply ignores others, such as the file information "interfaces" I mentioned above. This management pack is called "connman" and can be verified at the debian.org site at the address below:
https://packages.debian.org/search?keywords=connman

HOW TO KEEP FIXED IP ON DEBIAN JESSIE:

1- Edit the file "/etc/network/interfaces" and add (or edit) at the end of file, the lines below, adapting the information of your network or a fictitious network, at your discretion:
2- Edit the file "/etc/resolv.conf" and change the "nameserver". In my case I put the IP of my router and another one:
nameserver 192.168.0.1
nameserver 8.8.8.8

3- Locate the "connman" service. Make sure what name it takes on your Linux distribution. In my case it was "connman" anyway. To list the services running: ps -aux

4. Uninstall the "connman" service: apt-get purge connman

5. Restart Linux: reboot.

That way my device still worked connected to the router, being possible to access it by IP 192.168.0.15, which was the IP that I chose. But it is also possible to access directly through a cable connected between the device and the laptop.