diff --git a/config/net/c3d2.nix b/config/net/c3d2.nix
index a874c85..00fd244 100644
--- a/config/net/c3d2.nix
+++ b/config/net/c3d2.nix
@@ -56,7 +56,7 @@
         # "riscbert" = "6c:cf:39:00:05:95";
       };
       time = 300;
-      max-time = 24 * 3600;
+      max-time = 30 * 24 * 3600;
       router = "c3d2-gw3";
     };
     domainName = "c3d2.zentralwerk.org";
diff --git a/config/net/priv.nix b/config/net/priv.nix
index c1e7a51..7dd1a2d 100644
--- a/config/net/priv.nix
+++ b/config/net/priv.nix
@@ -17,7 +17,7 @@ lib.mkMerge (
         dhcp = {
           server = "priv${toString n}-gw";
           time = 300;
-          max-time = 14 * 24 * 3600;
+          max-time = 60 * 24 * 3600;
           router = "priv${toString n}-gw";
         };
         domainName = "priv${toString n}.zentralwerk.org";
diff --git a/config/net/pub.nix b/config/net/pub.nix
index 1a6765f..66135e5 100644
--- a/config/net/pub.nix
+++ b/config/net/pub.nix
@@ -5,7 +5,7 @@
       end = "172.20.79.253";
       router = "pub-gw";
       server = "pub-gw";
-      time = 300;
+      time = 120;
       max-time = 12 * 3600;
     };
     domainName = "pub.zentralwerk.org";
diff --git a/nix/nixos-module/container/dhcp-server.nix b/nix/nixos-module/container/dhcp-server.nix
index 7abaa50..aa5ff07 100644
--- a/nix/nixos-module/container/dhcp-server.nix
+++ b/nix/nixos-module/container/dhcp-server.nix
@@ -36,9 +36,8 @@ in
         pools = [ {
             pool = "${dhcp.start} - ${dhcp.end}";
         } ];
-        renew-timer = dhcp.time / 2;
-        rebind-timer = dhcp.time;
-        valid-lifetime = dhcp.max-time;
+        valid-lifetime = dhcp.time;
+        max-valid-lifetime = dhcp.max-time;
         option-data = [ {
           space = "dhcp4";
           name = "routers";
@@ -199,9 +198,8 @@ in
               pool = "${prefix}:c3d2:c3d2:c3d2:1000 - ${prefix}:c3d2:c3d2:c3d2:ffff";
               #pool = subnet;
             } ];
-            renew-timer = dhcp.time / 2;
-            rebind-timer = dhcp.time;
-            valid-lifetime = dhcp.max-time;
+            valid-lifetime = dhcp.time;
+            max-valid-lifetime = dhcp.max-time;
             #option-data = [ {
             #  space = "dhcp6";
             #  name = "domain-search";