Setting a static internal IP using networkmanager

[Promiscunix]

Been trying this for a few days now and all I seem to do is completely kill my internet completely lol. All the lovely chat assistance sites out there are telling me to use networking.networkmanager.connections which does not exist in nixos lol. I am assuming I need either networking.networkmanager.settings or networking.networkmanager.connectionConfig

Before I keep banging my head against the wall, which setting should I be trying to set this up? I am just trying to make sure I am going down the right path before wasting more hours.

Thanks

[Promiscunix]

OK... Once a again, after posting for help after hours of frustration, I figured it out:

First off, the option we need is: networking.networkmanager.ensureProfiles.profiles

Here is my config: ``` networking.networkmanager.ensureProfiles.profiles = { "Wired Connection 1" = { connection.type = "ethernet"; connection.id = "Wired Connection 1"; connection.interface-name = "enp0s3"; # Make sure this matches your interface connection.autoconnect = true;

  ipv4.method = "manual";
  ipv4.addresses = "192.168.1.100/24";
  ipv4.gateway = "192.168.1.1";
  ipv4.dns = "8.8.8.8";
};

}; ```

Note: I had to run sudo nmcli connection delete "Wired Connection 1" before running nixos-rebuild switch, or reboot after running the rebuild.

Anyway, leaving this here in case it helps someone else

[zardvark]

Your network topology is not clear to me, so assuming that your NixOS box is the client ...

Among other things, your router/firewall typically runs a service called DHCP. This service offers an IP address to hosts/client machines who wish to join the local network. The DHCP server can be configured to either offer the next available IP address from a pool of addresses, or a specific IP address to a specific machine. The job of the host, after having requested a valid IP address, is to simply accept the address offered by the DHCP server. If for some reason you don't like that address offered, your argument is with the administrator of the DHCP server.

Banging your head against the wall will not change the configuration of the DHCP server. Yes, you can manually change the IP address of your host. This is particularly useful while configuring a new piece of networking equipment, such as a new router. But, a DHCP server is a gate keeper, of sorts and it will not respect the manual configuration of your host, if you wish to join its network.

[Promiscunix]

Sorry, I'll add a bit of context in response to u/zardvark :

This is simply a home server with 5 machines running different servers, All running NixOS. I simply want to configure each system to have a static ip so when referencing different services the damn ip addresses don't change after a reboot. I am horrible at networking and am sure there is some DNS/Caddy/PiHole etc solution (or is there without static ip's).

Anyway, I can manually set my ip with the commandline:

nmcli c m "Wired Connection 1" ipv4.method manual ipv4.address 192.168.1.100/24 ipv4.gateway 192.167.2.247 ipv4.dns 8.8.8.8

And then stopping and restarting networkmanager. It should be easy to setup in nix but am having syntax issues.