diff --git a/ProjectPlugins/CodexPlugin/CodexContainerRecipe.cs b/ProjectPlugins/CodexPlugin/CodexContainerRecipe.cs
index 867b9bf..533698a 100644
--- a/ProjectPlugins/CodexPlugin/CodexContainerRecipe.cs
+++ b/ProjectPlugins/CodexPlugin/CodexContainerRecipe.cs
@@ -29,20 +29,30 @@ namespace CodexPlugin
 
             var config = startupConfig.Get<CodexStartupConfig>();
 
-            AddExposedPortAndVar("CODEX_API_PORT", ApiPortTag);
+            var apiPort = CreateApiPort(config, ApiPortTag);
+            AddEnvVar("CODEX_API_PORT", apiPort);
             AddEnvVar("CODEX_API_BINDADDR", "0.0.0.0");
 
             var dataDir = $"datadir{ContainerNumber}";
             AddEnvVar("CODEX_DATA_DIR", dataDir);
             AddVolume($"codex/{dataDir}", GetVolumeCapacity(config));
 
-            AddExposedPortAndVar("CODEX_DISC_PORT", DiscoveryPortTag);
+            var discPort = CreateP2pPort(config, DiscoveryPortTag);
+            AddEnvVar("CODEX_DISC_PORT", discPort);
             AddEnvVar("CODEX_LOG_LEVEL", config.LogLevelWithTopics());
 
-            // This makes the node announce itself to its local (pod) IP address.
-            AddEnvVar("NAT_IP_AUTO", "true");
+            if (config.IsPublicTestNet)
+            {
+                todo
+                AddEnvVar("CODEX_NAT", "required");
+            }
+            else
+            {
+                // This makes the node announce itself to its local (pod) IP address.
+                AddEnvVar("NAT_IP_AUTO", "true");
+            }
 
-            var listenPort = AddExposedPort(ListenPortTag);
+            var listenPort = CreateP2pPort(config, ListenPortTag);
             AddEnvVar("CODEX_LISTEN_ADDRS", $"/ip4/0.0.0.0/tcp/{listenPort.Number}");
 
             if (!string.IsNullOrEmpty(config.BootstrapSpr))
@@ -67,7 +77,7 @@ namespace CodexPlugin
             }
             if (config.MetricsEnabled)
             {
-                var metricsPort = AddInternalPort(MetricsPortTag);
+                var metricsPort = CreateApiPort(config, MetricsPortTag);
                 AddEnvVar("CODEX_METRICS", "true");
                 AddEnvVar("CODEX_METRICS_ADDRESS", "0.0.0.0");
                 AddEnvVar("CODEX_METRICS_PORT", metricsPort);
@@ -124,5 +134,23 @@ namespace CodexPlugin
             if (!string.IsNullOrEmpty(DockerImageOverride)) return DockerImageOverride;
             return DefaultDockerImage;
         }
+
+        private Port CreateP2pPort(CodexStartupConfig config, string tag)
+        {
+            if (config.IsPublicTestNet)
+            {
+                return AddExposedPort(tag);
+            }
+            return AddInternalPort(tag);
+        }
+
+        private Port CreateApiPort(CodexStartupConfig config, string tag)
+        {
+            if (config.IsPublicTestNet)
+            {
+                return AddInternalPort(tag);
+            }
+            return AddExposedPort(tag);
+        }
     }
 }
diff --git a/ProjectPlugins/CodexPlugin/CodexSetup.cs b/ProjectPlugins/CodexPlugin/CodexSetup.cs
index 0f9f37f..6240fb8 100644
--- a/ProjectPlugins/CodexPlugin/CodexSetup.cs
+++ b/ProjectPlugins/CodexPlugin/CodexSetup.cs
@@ -22,6 +22,7 @@ namespace CodexPlugin
         /// Provides an invalid proof every N proofs
         /// </summary>
         ICodexSetup WithSimulateProofFailures(uint failEveryNProofs);
+        ICodexSetup AsPublicTestNet();
     }
 
     public class CodexLogCustomTopics
@@ -118,6 +119,12 @@ namespace CodexPlugin
             return this;
         }
 
+        public ICodexSetup AsPublicTestNet()
+        {
+            IsPublicTestNet = true;
+            return this;
+        }
+
         public string Describe()
         {
             var args = string.Join(',', DescribeArgs());
@@ -126,6 +133,7 @@ namespace CodexPlugin
 
         private IEnumerable<string> DescribeArgs()
         {
+            if (IsPublicTestNet) yield return "<!>Public TestNet<!>";
             yield return $"LogLevel={LogLevelWithTopics()}";
             if (BootstrapSpr != null) yield return $"BootstrapNode={BootstrapSpr}";
             if (StorageQuota != null) yield return $"StorageQuota={StorageQuota}";
diff --git a/ProjectPlugins/CodexPlugin/CodexStartupConfig.cs b/ProjectPlugins/CodexPlugin/CodexStartupConfig.cs
index 709fad9..3de9c4b 100644
--- a/ProjectPlugins/CodexPlugin/CodexStartupConfig.cs
+++ b/ProjectPlugins/CodexPlugin/CodexStartupConfig.cs
@@ -18,6 +18,7 @@ namespace CodexPlugin
         public bool? EnableValidator { get; set; }
         public TimeSpan? BlockMaintenanceInterval { get; set; }
         public int? BlockMaintenanceNumber { get; set; }
+        public bool IsPublicTestNet { get; set; } = false;
 
         public string LogLevelWithTopics()
         {