{ config, lib, pkgs, modulesPath, ... }: let external-mac = "c4:37:72:55:4e:1c"; external-gw = "178.254.28.1"; external-ip = "178.254.30.202"; external-ip6 = "2a00:6800:3:18c::2"; external-gw6 = "2a00:6800:3::1"; external-netmask = 22; external-netmask6 = 64; internal-ip = config.krebs.build.host.nets.retiolum.ip4.addr; ext-if = "et0"; # gets renamed on the fly in { services.udev.extraRules = '' SUBSYSTEM=="net", ATTR{address}=="${external-mac}", NAME="${ext-if}" ''; networking = { interfaces."${ext-if}" = { ipv4.addresses = [{ address = external-ip; prefixLength = external-netmask; }]; ipv6.addresses = [{ address = external-ip6; prefixLength = external-netmask6; }]; }; defaultGateway6 = { address = external-gw6; interface = ext-if; }; defaultGateway = external-gw; nameservers = [ "1.1.1.1" ]; }; }