apu: setup dynamic dns record based on DHCP leases

2026-02-21 13:05:22 +02:00
parent 6690b5c1ea
commit 13e119a6c3
5 changed files with 324 additions and 1 deletions
--- a/modules/vlans.nix
+++ b/modules/vlans.nix
@@ -26,6 +26,11 @@ let
          default = { };
        };
        ipv6 = lib.mkEnableOption "ipv6";
+        domain = lib.mkOption {
+          type = lib.types.str;
+          default = "home.arpa";
+          description = "Domain name to advertise via DHCP";
+        };
      };
    };

@@ -96,6 +101,7 @@ let
      id,
      ipv6,
      staticLeases,
+      domain,
      ...
    }:
    {
@@ -115,8 +121,17 @@ let
        dhcpServerConfig = {
          PoolOffset = 255;
          DNS = "10.${toString id}.0.1";
+          EmitDNS = true;
        };
-        extraConfig = lib.concatLines (lib.mapAttrsToList buildStaticLease staticLeases);
+        extraConfig = lib.concatLines (
+          (lib.mapAttrsToList buildStaticLease staticLeases)
+          ++ [
+            ''
+              [DHCPServer]
+              SendOption=15:string:${domain}
+            ''
+          ]
+        );
      };
    };