From 618747a28e93b9097324afffb41b3b77194ea6ae Mon Sep 17 00:00:00 2001
From: sinanmohd <sinan@sinanmohd.com>
Date: Sat, 23 Nov 2024 18:22:47 +0530
Subject: kay/router: allow access to gpon modem

---
 os/kay/modules/router.nix | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/os/kay/modules/router.nix b/os/kay/modules/router.nix
index 0d01465..64c653c 100644
--- a/os/kay/modules/router.nix
+++ b/os/kay/modules/router.nix
@@ -1,6 +1,10 @@
 { ... }: let
   wanInterface = "ppp0";
 
+  gponInterface = "enp3s0";
+  gponHost = "192.168.38.2";
+  gponPrefix = 24;
+
   lanInterface = "enp8s0f3u1";
   subnet = "10.0.0.0";
   prefix = 24;
@@ -19,10 +23,14 @@ in {
       externalInterface = wanInterface;
       internalInterfaces = [ lanInterface ];
     };
-    interfaces."${lanInterface}" = {
-      ipv4.addresses = [{ 
-        address = host;
-        prefixLength  = prefix;
+    interfaces = {
+      ${lanInterface}.ipv4.addresses = [{
+          address = host;
+          prefixLength  = prefix;
+      }];
+      ${gponInterface}.ipv4.addresses = [{
+          address = gponHost;
+          prefixLength  = gponPrefix;
       }];
     };
     firewall = {
@@ -36,6 +44,14 @@ in {
         iptables -t mangle -A FORWARD -p tcp --tcp-flags SYN,RST SYN \
             -o ${wanInterface} \
             -j TCPMSS --clamp-mss-to-pmtu
+
+        iptables -t nat -I POSTROUTING 1 \
+            -s ${subnet}/${toString prefix} \
+            -o ${gponInterface} \
+            -j MASQUERADE
+        iptables -t mangle -A FORWARD -p tcp --tcp-flags SYN,RST SYN \
+            -o ${gponInterface} \
+            -j TCPMSS --clamp-mss-to-pmtu
       '';
     };
   };
-- 
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