I did `ip link show`. It shows that my Ethernet interface is `eno1`.

To check, I did `ping -c 3 -I eno1 8.8.8.8`. It sends 3 packets to Google's server without an issue.

I wrote `container.nix` with:

```
{ config, lib, pkgs, ... }:

{
  networking = {
    firewall.enable = false; # Don't need a firewall in developement
    nat = {
      enable = true;
      internalInterfaces = [ "ve-+" ]; # Match every interface
      externalInterface = "eno1"; # Reroute to external ethernet
    };
  };
}
```

Starting and logging into a new container `net-test`:

```
sudo nixos-container create net-test
sudo nixos-container update net-test --config-file=./container.nix
sudo nixos-container start net-test
sudo nixos-container root-login net-test
```

`ping -c 3 8.8.8.8` inside the container fails.