diff --git a/.env.example b/.env.example
index 3d58168..176f267 100644
--- a/.env.example
+++ b/.env.example
@@ -1,3 +1,6 @@
 ACTIVE_SIGNING_KEY=5K...
 ACCOUNT=acc...
 NODE_IP=...
+# If your public ports are different from your node config.js ports (requires NAT/port forwarding)
+#RPCNODEPORT=15000
+#P2PPORT=15001
diff --git a/witness_action.js b/witness_action.js
index 4117a8c..1a584de 100644
--- a/witness_action.js
+++ b/witness_action.js
@@ -12,6 +12,10 @@ const {
   rpcNodePort, p2pPort, streamNodes, chainId,
 } = config;
 
+// For external NATed-ports customization
+const extRPCNodePort = Number(String(process.env.RPCNODEPORT)) || rpcNodePort;
+const extP2PPort = Number(String(process.env.P2PPORT)) || p2pPort;
+
 function broadcastWitnessAction(contractAction, contractPayload) {
   const client = new dhive.Client(streamNodes[0]);
   const transaction = {
@@ -46,8 +50,8 @@ program
   .command('register')
   .action(() => broadcastWitnessAction('register', {
     IP: ip,
-    RPCPort: rpcNodePort,
-    P2PPort: p2pPort,
+    RPCPort: extRPCNodePort,
+    P2PPort: extP2PPort,
     signingKey: publicSigningKey,
     enabled: true,
   }));
@@ -56,8 +60,8 @@ program
   .command('unregister')
   .action(() => broadcastWitnessAction('register', {
     IP: ip,
-    RPCPort: rpcNodePort,
-    P2PPort: p2pPort,
+    RPCPort: extRPCNodePort,
+    P2PPort: extP2PPort,
     signingKey: publicSigningKey,
     enabled: false,
   }));