Static ip on eth0

[Johan Ingvast]

Hi

I use Debian 10.3 on a beaglebone enhanced industrial and try to configure eth0 to a static ip.

https://wiki.debian.org/NetworkConfiguration  claim /etc/network/interfaces should have the lines

   auto eth0

   iface eth0 inet static

       address 192.168.10.156

       netmask 255.255.255.0

       gateway 192.168.10.1

the commands ifup and ifdown should then take care of the switching.

$ ifdown eth0

results in an error 

   ifdown: interface eth0 not configured

When I reboot, I do get the right address and everything seem to work.

However the service networking.service gets an error.

Interestingly, the original version of /etc/network/interfaces does not mention eth0, yet it starts correctly. Is there some other mechanism starting it? 

What is the correct way of configuring static ip for eth0?

best

Johan Ingvast

[Johan Ingvast]

I think I found the solution.  

Debian for BB uses connman for handling eth0.

Found this that gives directions https://variwiki.com/index.php?title=Static_IP_Address

So what I had to do was 

As root

Find the service name by

        $ connmanctl services

It will output something like

        *AR Wired                ethernet_d05fb8efd72f_cable

The latter part will be used as reference to what to change

        $ connmanctl config --ipv4 manual 192.168.10.156 255.255.255.0 192.168.10.1

Where the order of the addresses are: ip netmask gateway

If you are on ethernet you will loose contact (in case the ip is changed), connect again with the new address.

You also need to change the nameservers (better to do before)

        $ connmanctl config --nameservers 8.8.8.8   4.4.4.4

[jonnymo]

Yeah, this pops up from time to time so perhaps there is a way to make it sticky or something.

Ex:

   https://groups.google.com/g/beagleboard/c/D0kLUD-zwHY/m/gqQW4FvBBAAJ

Or:

  https://forum.digikey.com/t/static-ip-on-beaglebone-black/4497

Cheers,

Jon 

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[Ren Waldura]

Helpful, thank you!

Why must the nameservers be changed?? I thought it was a property of the host, not the interface.

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[Johan Ingvast]

Correction, the command lines came out wrong. Should be 

     $ connmanctl config   ethernet_d05fb8efd72f_cable   --ipv4 manual 192.168.10.156 255.255.255.0 192.168.10.1 

and

     $ connmanctl config   ethernet_d05fb8efd72f_cable   --nameservers 8.8.8.8   4.4.4.4  

/johan

[Johan Ingvast]

Maybe they do not have to be changed. I guess it depends on what nameservers were from beginning. I just noted that when I set the new ip, I lost dns.
However, I did not try a reboot before I set the new nameservers.

/johan