diff --git a/hosts/mauville/default.nix b/hosts/mauville/default.nix
index 58e6d906..9418f90d 100644
--- a/hosts/mauville/default.nix
+++ b/hosts/mauville/default.nix
@@ -10,7 +10,6 @@
   domain = "raffauflabs.com";
   mediaDirectory = "/mnt/Media";
   archiveDirectory = "/mnt/Archive";
-  openPorts = [80 443 51413 9091];
 in {
   imports = [./hardware-configuration.nix ./home.nix];
 
@@ -59,9 +58,12 @@ in {
   };
 
   networking = {
-    firewall = {
-      allowedTCPPorts = openPorts;
-      allowedUDPPorts = openPorts;
+    firewall = let
+      transmissionPort = config.alyraffauf.containers.oci.transmission.port;
+      bitTorrentPort = config.alyraffauf.containers.oci.transmission.bitTorrentPort;
+    in {
+      allowedTCPPorts = [80 443 transmissionPort bitTorrentPort];
+      allowedUDPPorts = [bitTorrentPort];
     };
     # My router doesn't expose settings for NAT loopback
     # So we have to use this workaround.
@@ -102,7 +104,7 @@ in {
         enableACME = true;
         forceSSL = true;
         locations."/" = {
-          proxyPass = "http://127.0.0.1:8080";
+          proxyPass = "http://127.0.0.1:${toString config.alyraffauf.containers.oci.freshRSS.port}";
           proxyWebsockets = true; # needed if you need to use WebSocket
           extraConfig = ''
             proxy_buffering off;
@@ -126,7 +128,7 @@ in {
         enableACME = true;
         forceSSL = true;
         locations."/" = {
-          proxyPass = "http://127.0.0.1:32400";
+          proxyPass = "http://127.0.0.1:${toString config.alyraffauf.containers.oci.plexMediaServer.port}";
           proxyWebsockets = true; # needed if you need to use WebSocket
           extraConfig = ''
             proxy_buffering off;
@@ -138,7 +140,7 @@ in {
         enableACME = true;
         forceSSL = true;
         locations."/" = {
-          proxyPass = "http://127.0.0.1:13378";
+          proxyPass = "http://127.0.0.1:${toString config.alyraffauf.containers.oci.audiobookshelf.port}";
           # proxyWebsockets = true; # This breaks audiobookshelf.
           extraConfig = ''
             proxy_set_header X-Forwarded-For    $proxy_add_x_forwarded_for;
diff --git a/nixosModules/containers/oci/audiobookshelf/default.nix b/nixosModules/containers/oci/audiobookshelf/default.nix
index 75b121dd..ce22f149 100644
--- a/nixosModules/containers/oci/audiobookshelf/default.nix
+++ b/nixosModules/containers/oci/audiobookshelf/default.nix
@@ -12,12 +12,17 @@
       default = "/mnt/Media";
       type = lib.types.str;
     };
+    alyraffauf.containers.oci.audiobookshelf.port = lib.mkOption {
+      description = "Port for audiobookshelf.";
+      default = 13378;
+      type = lib.types.int;
+    };
   };
 
   config = lib.mkIf config.alyraffauf.containers.oci.audiobookshelf.enable {
     virtualisation.oci-containers.containers = {
       audiobookshelf = {
-        ports = ["0.0.0.0:13378:80"];
+        ports = ["0.0.0.0:${toString config.alyraffauf.containers.oci.audiobookshelf.port}:80"];
         image = "ghcr.io/advplyr/audiobookshelf:latest";
         environment = {TZ = "America/New_York";};
         volumes = ["abs_config:/config" "abs_metadata:/metadata" "${config.alyraffauf.containers.oci.audiobookshelf.mediaDirectory}:/Media"];
diff --git a/nixosModules/containers/oci/freshRSS/default.nix b/nixosModules/containers/oci/freshRSS/default.nix
index 719af35a..0c49a9fc 100644
--- a/nixosModules/containers/oci/freshRSS/default.nix
+++ b/nixosModules/containers/oci/freshRSS/default.nix
@@ -7,12 +7,17 @@
   options = {
     alyraffauf.containers.oci.freshRSS.enable =
       lib.mkEnableOption "Enable FreshRSS news client.";
+    alyraffauf.containers.oci.freshRSS.port = lib.mkOption {
+      description = "Port for FreshRSS.";
+      default = 8080;
+      type = lib.types.int;
+    };
   };
 
   config = lib.mkIf config.alyraffauf.containers.oci.freshRSS.enable {
     virtualisation.oci-containers.containers = {
       freshrss = {
-        ports = ["0.0.0.0:8080:80"];
+        ports = ["0.0.0.0:${toString config.alyraffauf.containers.oci.freshRSS.port}:80"];
         image = "freshrss/freshrss:latest";
         environment = {
           TZ = "America/New_York";
diff --git a/nixosModules/containers/oci/jellyfin/default.nix b/nixosModules/containers/oci/jellyfin/default.nix
index ad912648..051d4187 100644
--- a/nixosModules/containers/oci/jellyfin/default.nix
+++ b/nixosModules/containers/oci/jellyfin/default.nix
@@ -17,12 +17,17 @@
       default = "/mnt/Archive";
       type = lib.types.str;
     };
+    alyraffauf.containers.oci.jellyfin.port = lib.mkOption {
+      description = "Port for Jellyfin.";
+      default = 8096;
+      type = lib.types.int;
+    };
   };
 
   config = lib.mkIf config.alyraffauf.containers.oci.jellyfin.enable {
     virtualisation.oci-containers.containers = {
       jellyfin = {
-        ports = ["0.0.0.0:8096:8096"];
+        ports = ["0.0.0.0:${toString config.alyraffauf.containers.oci.jellyfin.port}:8096"];
         image = "jellyfin/jellyfin";
         environment = {TZ = "America/New_York";};
         volumes = [
diff --git a/nixosModules/containers/oci/plexMediaServer/default.nix b/nixosModules/containers/oci/plexMediaServer/default.nix
index 77b5e4c6..ecbcd3f2 100644
--- a/nixosModules/containers/oci/plexMediaServer/default.nix
+++ b/nixosModules/containers/oci/plexMediaServer/default.nix
@@ -17,12 +17,17 @@
       default = "/mnt/Archive";
       type = lib.types.str;
     };
+    alyraffauf.containers.oci.plexMediaServer.port = lib.mkOption {
+      description = "Port for Plex Media Server.";
+      default = 32400;
+      type = lib.types.int;
+    };
   };
 
   config = lib.mkIf config.alyraffauf.containers.oci.plexMediaServer.enable {
     virtualisation.oci-containers.containers = {
       plexMediaServer = {
-        ports = ["0.0.0.0:32400:32400"];
+        ports = ["0.0.0.0:${toString config.alyraffauf.containers.oci.plexMediaServer.port}:32400"];
         image = "plexinc/pms-docker:public";
         environment = {TZ = "America/New_York";};
         volumes = [
diff --git a/nixosModules/containers/oci/transmission/default.nix b/nixosModules/containers/oci/transmission/default.nix
index 0c623ff7..076f142c 100644
--- a/nixosModules/containers/oci/transmission/default.nix
+++ b/nixosModules/containers/oci/transmission/default.nix
@@ -17,12 +17,22 @@
       default = "/mnt/Archive";
       type = lib.types.str;
     };
+    alyraffauf.containers.oci.transmission.port = lib.mkOption {
+      description = "Port for Transmission.";
+      default = 9091;
+      type = lib.types.int;
+    };
+    alyraffauf.containers.oci.transmission.bitTorrentPort = lib.mkOption {
+      description = "Port for BitTorrent p2p services..";
+      default = 5143;
+      type = lib.types.int;
+    };
   };
 
   config = lib.mkIf config.alyraffauf.containers.oci.transmission.enable {
     virtualisation.oci-containers.containers = {
       transmission = {
-        ports = ["0.0.0.0:9091:9091" "0.0.0.0:51413:51413"];
+        ports = ["0.0.0.0:${toString config.alyraffauf.containers.oci.transmission.port}:9091" "0.0.0.0:${toString config.alyraffauf.containers.oci.transmission.bitTorrentPort}:51413"];
         image = "linuxserver/transmission:latest";
         environment = {
           PGID = "1000";