The story; Debian 11 VM installed. VM gets its IP address from router say 172.16.0.36. I edit /etc/network/interface file and change dhcp to static with IP address say 172.16.0.244. Restart network services. Go to router and reserve this IP address 172.16.0.244.

 

The fun begins. I can ping 172.16.0.244 till i restart unraid box. If i restart unraid box, i can not ping 172.16.0.244 but 172.16.0.36. My router also shows 172.16.0.36 as assigned address.

 

Here is IP config file;

 

 

Here is connection info;

 

Any idea what's going on?

 

 

Changes to /etc/network/interfaces are useless if network manager is enabled.

Make sure to not use network manager, by disabling it:

sudo service network-manager stop
sudo update-rc.d NetworkManager remove

 

Then, reload interface:

ifdown enp1s0
ifup enp1s0

 

Edited December 23, 20214 yr by ghost82

I too use Debian 11 Bullseye in a VM install method.  I do so to run Home Assistant w/ a supervised using Docker.  To remove Network-Manager  breaks Home Assistant (HA) as HA requires Network-Manager as a dependency and not only complains but will refuse to install HA updates.  I recommend setting the IP to static on your DHCP Server in your Server or Router, whichever is providing your DHCP Service.

Edited November 28, 20223 yr by TLD
Clarification