From a7450362ce806cbd255d4d5142facc13bf6789ec Mon Sep 17 00:00:00 2001
From: Sebastien Bourdeauducq <sb@m-labs.hk>
Date: Fri, 4 Nov 2022 16:45:29 +0800
Subject: [PATCH] aux: ipv6

---
 aux-etc-nixos/configuration.nix | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/aux-etc-nixos/configuration.nix b/aux-etc-nixos/configuration.nix
index d0dfbc25..0b631e9f 100644
--- a/aux-etc-nixos/configuration.nix
+++ b/aux-etc-nixos/configuration.nix
@@ -4,6 +4,7 @@ let
   netifWan = "enp0s25";
   netifLan = "enp3s0";
   netifWifi = "wlp1s0";
+  netifSit = "henet0";
 in
 {
   imports =
@@ -43,18 +44,43 @@ in
       address = "192.168.1.1";
       prefixLength = 24;
     }];
+    ipv6.addresses = [{
+      address = "2001:470:f891:1::";
+      prefixLength = 64;
+    }];
   };
   networking.interfaces."${netifWifi}" = {
     ipv4.addresses = [{
       address = "192.168.15.1";
       prefixLength = 24;
     }];
+    ipv6.addresses = [{
+      address = "2001:470:f891:2::";
+      prefixLength = 64;
+    }];
   };
+
+  networking.sits."${netifSit}" = {
+    dev = netifWan;
+    remote = "216.218.221.6";
+    local = "94.190.212.123";
+    ttl = 255;
+  };
+  networking.interfaces."${netifSit}".ipv6 = {
+    addresses = [{ address = "2001:470:18:390::2"; prefixLength = 64; }];
+    routes = [{ address = "::"; prefixLength = 0; }];
+  };
+  boot.kernel.sysctl."net.ipv6.conf.all.forwarding" = "1";
+  boot.kernel.sysctl."net.ipv6.conf.default.forwarding" = "1";
+  boot.kernel.sysctl."net.ipv6.conf.${netifLan}.accept_dad" = "0";
+  boot.kernel.sysctl."net.ipv6.conf.${netifWifi}.accept_dad" = "0";
+
   networking.firewall = {
     allowedTCPPorts = [ 53 ];
     allowedUDPPorts = [ 53 67 ];
     trustedInterfaces = [ netifLan ];
   };
+
   services.bind = {
     enable = true;
     listenOn = [];
@@ -72,6 +98,9 @@ in
       bind-interfaces
       dhcp-range=interface:${netifLan},192.168.1.81,192.168.1.254,24h
       dhcp-range=interface:${netifWifi},192.168.15.10,192.168.15.254,24h
+      enable-ra
+      dhcp-range=interface:${netifLan},::,constructor:${netifLan},ra-names
+      dhcp-range=interface:${netifWifi},::,constructor:${netifWifi},ra-only
 
       no-resolv