From 9ec2a403905b34d872f332cc7fb0aec305faa5f2 Mon Sep 17 00:00:00 2001
From: sinanmohd <sinan@sinanmohd.com>
Date: Sat, 3 Feb 2024 16:25:15 +0530
Subject: hosts/lia: init

---
 hosts/lia/modules/network/default.nix | 19 ++++++++++++++
 hosts/lia/modules/network/router.nix  | 47 +++++++++++++++++++++++++++++++++++
 2 files changed, 66 insertions(+)
 create mode 100644 hosts/lia/modules/network/default.nix
 create mode 100644 hosts/lia/modules/network/router.nix

(limited to 'hosts/lia/modules/network')

diff --git a/hosts/lia/modules/network/default.nix b/hosts/lia/modules/network/default.nix
new file mode 100644
index 0000000..927b2b5
--- /dev/null
+++ b/hosts/lia/modules/network/default.nix
@@ -0,0 +1,19 @@
+{ ... }: let
+  wan = "enp4s0f2";
+in
+{
+  imports = [
+    ./router.nix
+  ];
+
+  networking = {
+    interfaces.${wan}.ipv4.addresses = [{
+      address = "172.16.148.20";
+      prefixLength = 22;
+    }];
+    defaultGateway = {
+      address = "172.16.148.1";
+      interface = wan;
+    };
+  };
+}
diff --git a/hosts/lia/modules/network/router.nix b/hosts/lia/modules/network/router.nix
new file mode 100644
index 0000000..a6aef80
--- /dev/null
+++ b/hosts/lia/modules/network/router.nix
@@ -0,0 +1,47 @@
+{ ... }: let
+  wanInterface = "enp4s0f2";
+  lanInterfaces = [ "enp4s0f1" "enp4s0f3" ];
+
+  prefix = 24;
+  subnet = "192.168.1.0";
+  host = "192.168.1.1";
+
+  leaseRangeStart = "192.168.1.100";
+  leaseRangeEnd = "192.168.1.254";
+  nameServer = [ "10.0.0.2" "10.0.0.3" ];
+in
+{
+  networking = {
+    bridges."lan".interfaces = lanInterfaces;
+
+    nat = {
+      enable = true;
+      externalInterface = wanInterface;
+      internalInterfaces = [ "lan" ];
+    };
+
+    interfaces.lan = {
+      ipv4.addresses = [{ 
+        address = host;
+        prefixLength  = prefix;
+      }];
+    };
+
+    firewall = {
+      allowedUDPPorts = [ 53 67 ];
+      allowedTCPPorts = [ 53 ];
+      extraCommands = 
+        "iptables -t nat -I POSTROUTING 1 -s ${subnet}/${toString prefix} -o ${wanInterface} -j MASQUERADE";
+    };
+  };
+
+  services.dnsmasq = {
+    enable = true;
+
+    settings = {
+      server = nameServer;
+      dhcp-range = [ "${leaseRangeStart},${leaseRangeEnd}" ];
+      interface = [ "lan" ];
+    };
+  };
+}
-- 
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