diff --git a/hosts/carbon/ppp.nix b/hosts/carbon/ppp.nix
index 8a22cf6..7502205 100644
--- a/hosts/carbon/ppp.nix
+++ b/hosts/carbon/ppp.nix
@@ -57,4 +57,23 @@
     ip46tables -t mangle -A forward-mangle -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --set-mss 1416
   '';
 
+  networking.interfaces.net-heimnetz.useDHCP = true;
+  networking.interfaces.ppp-dtagdsl.useDHCP = true;
+
+  networking.dhcpcd = {
+    enable = true;
+    allowInterfaces = [
+      "net-heimnetz"
+      "ppp-dtagdsl"
+    ];
+    wait = "ipv6";
+    extraConfig = ''
+      ipv6only
+      noipv6rs
+      interface ppp-dtagdsl
+        ipv6rs
+        ia_pd 1/::/56 net-heimnetz/201/64
+    '';
+  };
+
 }