feat: enable IPv6 networking

configuration.nix

@@ -5,6 +5,7 @@ in
 { lib, ... }: {
   imports = [
     ./hardware-configuration.nix
+    ./networking.nix
     ./audit.nix
 
     ./openssh.nix
@@ -36,9 +37,7 @@ in
 
   boot.tmp.cleanOnBoot = true;
   zramSwap.enable = true;
-  networking.hostName = "quasar";
   users.users.root.initialPassword = "asunarovow";
-  networking.domain = "";
   nix.allowedUsers = [ "@wheel" "root" ];
   console.keyMap = "us";
   system.stateVersion = "23.11";

networking.nix

@@ -0,0 +1,14 @@
+{
+  networking.hostName = "quasar";
+  networking.domain = "";
+  networking.interfaces.ens18 = {
+    ipv6.addresses = [{
+      address = "2a02:c206:2209:5178:0000:0000:0000:0001";
+      prefixLength = 64;
+    }];
+  };
+  networking.defaultGateway6 = {
+    address = "fe80::1";
+    interface = "ens18";
+  };
+}