🔓 NAT Type Strict? How to Fix It and Get Open NAT (Complete Guide)

You’re playing online games…

👉 Matchmaking takes forever
👉 Cannot join friends
👉 Voice chat not working

Then you see:

👉 NAT Type: Strict

👉 This is a major problem for online gaming.

🔍 What is NAT Type?

NAT (Network Address Translation) controls how your device connects to the internet through your router.

In gaming, NAT type determines:

👉 How easily you can connect to other players

⚙️ Types of NAT
🟢 Open NAT

👉 Best connection

Fast matchmaking

No restrictions

🟡 Moderate NAT

👉 Limited connection

Some restrictions

🔴 Strict NAT

👉 Worst case

Cannot connect to many players

Long matchmaking

Voice issues

🧩 Why You Have Strict NAT
1️⃣ Router Blocking Incoming Traffic

👉 Default security behavior

2️⃣ No Port Forwarding

👉 Required ports are closed

3️⃣ Double NAT

👉 Two routers in the network

4️⃣ ISP Restrictions (CGNAT)

👉 You don’t have a public IP

🔄 Step-by-Step Fix (Pro Method)
✅ Step 1: Enable UPnP (Easy Fix)

👉 Go to router settings

Enable:

👉 UPnP (Universal Plug and Play)

✅ Step 2: Port Forwarding (Manual Fix)

👉 Open required ports for your game

Example:

TCP / UDP ports

✅ Step 3: Use DMZ (Advanced)

👉 Assign your device to DMZ

⚠️ Use carefully (security risk)

✅ Step 4: Check for Double NAT

👉 If using:

ISP modem + router

👉 Set one to bridge mode

✅ Step 5: Check Public IP

👉 If behind CGNAT:

👉 Contact ISP

📡 NAT Type Comparison
NAT Type Connectivity Gaming Experience
Open Full Best
Moderate Limited OK
Strict Restricted Poor
🚀 Best Fix Strategy

👉 Try in this order:

Enable UPnP

Port forward

Check double NAT

Contact ISP

⚠️ Common Mistakes

Ignoring router settings ❌

Using multiple routers ❌

Not checking ISP NAT ❌

🧠 Pro Tips (From Real IT Work)

UPnP is fastest fix

Port forwarding = more control

Avoid double NAT setups

Always verify NAT after changes

🏢 Real-World Case

Gamer:

👉 NAT Type: Strict

Cause:

👉 Double NAT

Fix:

👉 Bridge mode → Open NAT

🔥 Key Insight

👉 “NAT controls your ability to connect—not your speed”

🛠️ Example Scenario

Cannot join friends:

👉 Strict NAT

Fix:

👉 Enable UPnP → works instantly

🔗 Learn More About Network Optimization

https://comsiam.com

✅ Conclusion

Fixing NAT type can instantly improve your online gaming experience—especially matchmaking and connectivity.

💬 Question for You

What NAT type are you using right now?