diff --git a/config/RemoteBuild.nix b/config/RemoteBuild.nix
index de228d5..1861e1d 100644
--- a/config/RemoteBuild.nix
+++ b/config/RemoteBuild.nix
@@ -89,7 +89,7 @@ in
       };
       services.openssh.knownHosts.nixbuilder = {
         publicKey = serverSshPublicKey;
-        extraHostNames = [ "[fd09:8d46:b26:0:8079:82ff:fe1a:916a]:22143" ];
+        extraHostNames = [ "[${config.module.const.home}]:22143" ];
       };
     })
   ];
diff --git a/home/file/ssh/config b/home/file/ssh/config
index ccf76b6..fa4a503 100644
--- a/home/file/ssh/config
+++ b/home/file/ssh/config
@@ -4,7 +4,7 @@ Host *
 	ControlPersist yes
 
 Host dasha
-	HostName dasha.local
+	HostName fd09:8d46:b26:0:29b3:d9b5:d1e9:220f
 	User root
 	Port 22143
 
diff --git a/host/x86_64-linux/dasha/Network.nix b/host/x86_64-linux/dasha/Network.nix
index 77d1e5a..a25571d 100644
--- a/host/x86_64-linux/dasha/Network.nix
+++ b/host/x86_64-linux/dasha/Network.nix
@@ -1,9 +1,9 @@
-{ ... }:
+{ config, ... }:
 {
   networking = {
     firewall.extraCommands = ''
       # Local access.
-      ip6tables -I INPUT -j ACCEPT -s fd09:8d46:0b26::/48
+      ip6tables -I INPUT -j ACCEPT -s ${config.module.const.ula}
     '';
   };
 }
diff --git a/host/x86_64-linux/desktop/Network.nix b/host/x86_64-linux/desktop/Network.nix
index 77d1e5a..a25571d 100644
--- a/host/x86_64-linux/desktop/Network.nix
+++ b/host/x86_64-linux/desktop/Network.nix
@@ -1,9 +1,9 @@
-{ ... }:
+{ config, ... }:
 {
   networking = {
     firewall.extraCommands = ''
       # Local access.
-      ip6tables -I INPUT -j ACCEPT -s fd09:8d46:0b26::/48
+      ip6tables -I INPUT -j ACCEPT -s ${config.module.const.ula}
     '';
   };
 }
diff --git a/host/x86_64-linux/home/Blocky.nix b/host/x86_64-linux/home/Blocky.nix
index 6a60993..53efe0a 100644
--- a/host/x86_64-linux/home/Blocky.nix
+++ b/host/x86_64-linux/home/Blocky.nix
@@ -1,4 +1,4 @@
-{ ... }:
+{ config, ... }:
 {
   services.blocky = {
     enable = true;
@@ -84,10 +84,10 @@
       };
       customDNS.mapping =
         let
-          block = host: { ${host} = "0.0.0.0"; };
+          block = host: { ${host} = "0.0.0.0,::"; };
         in
         {
-          "voronind.com" = "10.0.0.1,fd09:8d46:b26:0:8079:82ff:fe1a:916a";
+          "voronind.com" = "10.0.0.1,${config.module.const.home}";
           "dasha.local" = "fd09:8d46:b26:0:29b3:d9b5:d1e9:220f";
           "desktop.local" = "fd09:8d46:b26:0:2ef8:c58a:c1ac:6cd8";
           "home.local" = "fd09:8d46:b26:0:8079:82ff:fe1a:916a";
diff --git a/host/x86_64-linux/home/Const.nix b/host/x86_64-linux/home/Const.nix
index 717bcab..108cdbe 100644
--- a/host/x86_64-linux/home/Const.nix
+++ b/host/x86_64-linux/home/Const.nix
@@ -1,4 +1,4 @@
-{ ... }:
+{ config, ... }:
 {
   config.module.const.host = {
     data = "/storage/hot_2/data";
@@ -12,7 +12,7 @@
       sslCertificateKey = "/etc/letsencrypt/live/voronind.com/privkey.pem";
       allowLocal = ''
         allow 10.0.0.0/8;
-        allow fd09:8d46:b26::/48;
+        allow ${config.module.const.ula};
         allow 127.0.0.1/32;
         allow ::1/128;
         deny all;
diff --git a/host/x86_64-linux/home/Network.nix b/host/x86_64-linux/home/Network.nix
index 45e7582..7413396 100644
--- a/host/x86_64-linux/home/Network.nix
+++ b/host/x86_64-linux/home/Network.nix
@@ -9,7 +9,7 @@
 }:
 let
   internal = "10.0.0.1"; # Lan host IP address.
-  internal6 = "fd09:8d46:b26:0:8079:82ff:fe1a:916a"; # Lan host IP6 address.
+  internal6 = config.module.const.home; # Lan host IP6 address.
 
   lan = "br0"; # Lan interface.
   wan = "enp8s0"; # Wan interface.
diff --git a/host/x86_64-linux/max/Network.nix b/host/x86_64-linux/max/Network.nix
index 77d1e5a..a25571d 100644
--- a/host/x86_64-linux/max/Network.nix
+++ b/host/x86_64-linux/max/Network.nix
@@ -1,9 +1,9 @@
-{ ... }:
+{ config, ... }:
 {
   networking = {
     firewall.extraCommands = ''
       # Local access.
-      ip6tables -I INPUT -j ACCEPT -s fd09:8d46:0b26::/48
+      ip6tables -I INPUT -j ACCEPT -s ${config.module.const.ula}
     '';
   };
 }
diff --git a/host/x86_64-linux/msi/Network.nix b/host/x86_64-linux/msi/Network.nix
index 77d1e5a..a25571d 100644
--- a/host/x86_64-linux/msi/Network.nix
+++ b/host/x86_64-linux/msi/Network.nix
@@ -1,9 +1,9 @@
-{ ... }:
+{ config, ... }:
 {
   networking = {
     firewall.extraCommands = ''
       # Local access.
-      ip6tables -I INPUT -j ACCEPT -s fd09:8d46:0b26::/48
+      ip6tables -I INPUT -j ACCEPT -s ${config.module.const.ula}
     '';
   };
 }
diff --git a/host/x86_64-linux/thinkpad/Network.nix b/host/x86_64-linux/thinkpad/Network.nix
index 77d1e5a..a25571d 100644
--- a/host/x86_64-linux/thinkpad/Network.nix
+++ b/host/x86_64-linux/thinkpad/Network.nix
@@ -1,9 +1,9 @@
-{ ... }:
+{ config, ... }:
 {
   networking = {
     firewall.extraCommands = ''
       # Local access.
-      ip6tables -I INPUT -j ACCEPT -s fd09:8d46:0b26::/48
+      ip6tables -I INPUT -j ACCEPT -s ${config.module.const.ula}
     '';
   };
 }
diff --git a/option/Const.nix b/option/Const.nix
index 6449ba2..6aeea1e 100644
--- a/option/Const.nix
+++ b/option/Const.nix
@@ -17,6 +17,14 @@
       default = "https://git.voronind.com/voronind/nix.git";
       type = lib.types.str;
     };
+    home = lib.mkOption {
+      default = "fd09:8d46:b26:0:8079:82ff:fe1a:916a";
+      type = lib.types.str;
+    };
+    ula = lib.mkOption {
+      default = "fd09:8d46:b26::/48";
+      type = lib.types.str;
+    };
     host = lib.mkOption {
       default = { };
       type = lib.types.attrs;