diff --git a/hosts/carbon/net-gastnetz.nix b/hosts/carbon/net-gastnetz.nix
index 361cc46..2ce3c9a 100644
--- a/hosts/carbon/net-gastnetz.nix
+++ b/hosts/carbon/net-gastnetz.nix
@@ -20,9 +20,10 @@
   services.radvd.config = ''
     interface net-gastnetz {
       AdvSendAdvert on;
+      MaxRtrAdvInterval 30;
       prefix ::/64 {
-        AdvValidLifetime 60;
-        AdvPreferredLifetime 30;
+        AdvValidLifetime 300;
+        AdvPreferredLifetime 120;
       };
       RDNSS 2620:fe::fe 2620:fe::9 {}; # Quad 9
     };
diff --git a/hosts/carbon/net-heimnetz.nix b/hosts/carbon/net-heimnetz.nix
index 36e42dd..40b8e05 100644
--- a/hosts/carbon/net-heimnetz.nix
+++ b/hosts/carbon/net-heimnetz.nix
@@ -22,9 +22,10 @@
   services.radvd.config = ''
     interface net-heimnetz {
       AdvSendAdvert on;
+      MaxRtrAdvInterval 30;
       prefix ::/64 {
-        AdvValidLifetime 60;
-        AdvPreferredLifetime 30;
+        AdvValidLifetime 300;
+        AdvPreferredLifetime 120;
       };
       RDNSS fd00:152:152::1 {};
       DNSSL net.clerie.de {};
diff --git a/hosts/carbon/net-iot.nix b/hosts/carbon/net-iot.nix
index 96da523..6b0cd7b 100644
--- a/hosts/carbon/net-iot.nix
+++ b/hosts/carbon/net-iot.nix
@@ -23,9 +23,10 @@
   services.radvd.config = ''
     interface net-iot {
       AdvSendAdvert on;
+      MaxRtrAdvInterval 30;
       prefix ::/64 {
-        AdvValidLifetime 60;
-        AdvPreferredLifetime 30;
+        AdvValidLifetime 300;
+        AdvPreferredLifetime 120;
       };
       RDNSS fd00:152:152::1 {};
       DNSSL iot.clerie.de {};
diff --git a/hosts/carbon/net-mgmt.nix b/hosts/carbon/net-mgmt.nix
index b4dec25..c6c48da 100644
--- a/hosts/carbon/net-mgmt.nix
+++ b/hosts/carbon/net-mgmt.nix
@@ -20,9 +20,10 @@
   services.radvd.config = ''
     interface net-mgmt {
       AdvSendAdvert on;
+      MaxRtrAdvInterval 30;
       prefix ::/64 {
-        AdvValidLifetime 60;
-        AdvPreferredLifetime 30;
+        AdvValidLifetime 300;
+        AdvPreferredLifetime 120;
       };
     };
   '';