hosts/carbon: Migrate to DTAG DSL

hosts/carbon/configuration.nix

@@ -5,6 +5,8 @@
     [
       ./hardware-configuration.nix
       ../../configuration/router
+
+      ./ppp.nix
     ];
 
   boot.kernelParams = [ "console=ttyS0,115200n8" ];
@@ -88,7 +90,7 @@
   networking.nat = {
     enableIPv6 = true;
     enable = true;
-    externalInterface = "ppp-ntvdsl";
+    externalInterface = "ppp-dtagdsl";
     internalIPv6s = [ "fd00:152:152::/48" "fd00:3214:9453:4920::/64"];
     internalIPs = [ "10.152.0.0/16" "192.168.32.0/24" ];
   };
@@ -256,7 +258,7 @@
 
   clerie.firewall.enable = true;
   clerie.firewall.extraForwardFilterCommands = ''
-    ip46tables -A forward-filter -i enp1s0.202 -o ppp-ntvdsl -j ACCEPT
+    ip46tables -A forward-filter -i enp1s0.202 -o ppp-dtagdsl -j ACCEPT
     ip46tables -A forward-filter -i enp1s0.202 -j DROP
     ip46tables -A forward-filter -o enp1s0.202 -j DROP
   '';
@@ -264,29 +266,6 @@
     ip46tables -t mangle -A forward-mangle -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --set-mss 1416
   '';
 
-  services.pppd = {
-    enable = true;
-    peers.ntvdsl = {
-      config = ''
-        plugin pppoe.so net-dsl
-        user "dsl-31997-001#regio@bsa-vdsl"
-        ifname ppp-ntvdsl
-        persist
-        maxfail 0
-        holdoff 5
-        noipdefault
-        lcp-echo-interval 20
-        lcp-echo-failure 3
-        mtu 1456
-        hide-password
-        defaultroute
-        +ipv6
-        debug
-      '';
-    };
-  };
-
-
   clerie.monitoring = {
     enable = true;
     id = "104";