diff --git a/hosts/carbon/net-gastnetz.nix b/hosts/carbon/net-gastnetz.nix
index 9b1d968..361cc46 100644
--- a/hosts/carbon/net-gastnetz.nix
+++ b/hosts/carbon/net-gastnetz.nix
@@ -12,7 +12,6 @@
   ];
   networking.interfaces."net-gastnetz".ipv6.addresses = [
     { address = "fd00:3214:9453:4920::1"; prefixLength = 64; }
-    { address = "2001:4cd8:100:1313::1"; prefixLength = 64; } # public IPs for local network
   ];
   networking.interfaces."net-gastnetz".ipv4.addresses = [
     { address = "192.168.32.1"; prefixLength = 24; }
@@ -21,7 +20,10 @@
   services.radvd.config = ''
     interface net-gastnetz {
       AdvSendAdvert on;
-      prefix 2001:4cd8:100:1313::/64 {};
+      prefix ::/64 {
+        AdvValidLifetime 60;
+        AdvPreferredLifetime 30;
+      };
       RDNSS 2620:fe::fe 2620:fe::9 {}; # Quad 9
     };
   '';
diff --git a/hosts/carbon/net-heimnetz.nix b/hosts/carbon/net-heimnetz.nix
index 60e0bc6..36e42dd 100644
--- a/hosts/carbon/net-heimnetz.nix
+++ b/hosts/carbon/net-heimnetz.nix
@@ -14,7 +14,6 @@
   networking.interfaces."net-heimnetz".ipv6.addresses = [
     { address = "fe80::1"; prefixLength = 64; }
     { address = "fd00:152:152:4::1"; prefixLength = 64; }
-    { address = "2001:4cd8:100:1337::1"; prefixLength = 64; } # public IPs for local network
   ];
   networking.interfaces."net-heimnetz".ipv4.addresses = [
     { address = "10.152.4.1"; prefixLength = 24; }
@@ -23,7 +22,10 @@
   services.radvd.config = ''
     interface net-heimnetz {
       AdvSendAdvert on;
-      prefix 2001:4cd8:100:1337::/64 {};
+      prefix ::/64 {
+        AdvValidLifetime 60;
+        AdvPreferredLifetime 30;
+      };
       RDNSS fd00:152:152::1 {};
       DNSSL net.clerie.de {};
     };
diff --git a/hosts/carbon/net-iot.nix b/hosts/carbon/net-iot.nix
index 43e3c57..96da523 100644
--- a/hosts/carbon/net-iot.nix
+++ b/hosts/carbon/net-iot.nix
@@ -23,7 +23,10 @@
   services.radvd.config = ''
     interface net-iot {
       AdvSendAdvert on;
-      prefix fd00:152:152:205::/64 {};
+      prefix ::/64 {
+        AdvValidLifetime 60;
+        AdvPreferredLifetime 30;
+      };
       RDNSS fd00:152:152::1 {};
       DNSSL iot.clerie.de {};
     };