From 6a52b310565b2f0c93fe3e069394ed4a8aef81b0 Mon Sep 17 00:00:00 2001
From: Kjetil Orbekk <kj@orbekk.com>
Date: Tue, 30 Jan 2024 16:02:49 -0500
Subject: Router

---
 modules/router.nix | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/modules/router.nix b/modules/router.nix
index 33e8407..1e05b08 100644
--- a/modules/router.nix
+++ b/modules/router.nix
@@ -50,6 +50,14 @@ let
       "net.ipv4.conf.default.forwarding" = true;
       "net.ipv6.conf.all.forwarding" = true;
       "net.ipv6.conf.default.forwarding" = true;
+      # Do not prevent IPv6 autoconfiguration.
+      # See <http://strugglers.net/~andy/blog/2011/09/04/linux-ipv6-router-advertisements-and-forwarding/>.
+      "net.ipv6.conf.all.accept_ra" = 2;
+      "net.ipv6.conf.default.accept_ra" = 2;
+
+      # Forward IPv6 packets.
+      "net.ipv6.conf.all.forwarding" = true;
+      "net.ipv6.conf.default.forwarding" = true;
     };
 
     environment.systemPackages = with pkgs; [ tcpdump ];
-- 
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