👀 Views: 19 💬 Answers: 1 📅 Created: 2025-07-11

debian networking networkmanager bash

I'm working on a project and hit a roadblock. I'm working on a project and hit a roadblock. After trying multiple solutions online, I still can't figure this out. I'm working with a frustrating scenario with NetworkManager on Debian 11 where it completely ignores my static IP configuration. I've set up my `/etc/network/interfaces` file to define a static IP, but it seems like NetworkManager is still trying to obtain an IP address via DHCP. Here's the relevant section of my configuration: ```bash # /etc/network/interfaces auto eth0 iface eth0 inet static address 192.168.1.100 netmask 255.255.255.0 gateway 192.168.1.1 dns-nameservers 8.8.8.8 8.8.4.4 ``` I've also tried disabling NetworkManager completely by running `systemctl stop NetworkManager`, but after rebooting, it still seems to manage the network configuration. To ensure there are no conflicts, I removed the `eth0` connection from the NetworkManager GUI, but it still tries to manage the interface. When I check the logs using `journalctl -u NetworkManager`, I come across messages like: ``` NetworkManager[1234]: <warn> ...eth0: DHCPv4 request failed ``` I’ve also verified that the `ifupdown` package is installed, but `nmcli` reports that it’s still attempting to manage the connection. I even attempted to set the connection to unmanaged via `nmcli connection modify eth0 connection.autoconnect no`, but it still doesn't behave as expected. Do you have any suggestions on how to correctly configure NetworkManager to respect the static IP settings? Is there a way to completely disable NetworkManager for specific interfaces without causing these issues? My development environment is Ubuntu. I'm working on a API that needs to handle this. What's the correct way to implement this? Am I missing something obvious?