How I Secure My Cisco Router with a Public IP (4 Must-Know Tips)
In this video, I share 4 additional tips I use to secure my Cisco IOS router when it has a public IP address attached.
When your router is directly exposed to the internet, it is constantly being scanned. Without proper security, services like SSH, SNMP, DNS, or NTP can become entry points for attackers.
In this video, I’ll show practical configurations that I actually use in my setup, including:
🛑 Using ACLs to filter traffic on WAN and management access
🔐 Securing SSH with key-based authentication and login protection
⚙️ Disabling or restricting unnecessary services
🌍 Checking your public IP exposure using tools like Shodan and Censys
This is not just theory — these are real configurations you can apply to improve your router security.
🧠 What You’ll Learn
How to protect your router from unauthorized access
How to limit exposed services on a public IP
How to reduce attack surface on Cisco IOS
How to verify your router from an attacker’s perspective
------------------------------------------------------------------------
Timestamp
00:00 - Problem (Intro)
00:13 - Use ACLs Properly
00:26 - Apply Inbound ACL in WAN Interface
01:08 - Apply ACL in Management Service (SSH)
01:20 - Add Block Attemp Login in Cisco
01:36 - Secure Management Service
01:43 - Login SSH Using Public Key Only
01:46 - Enable Secret Command
01:53 - Enable Service Password Encryption
02:08 - Secure Your Running Service
02:45 - Scan You Public IP Using Online Scanner
03:06 - Closing
------------------------------------------------------------------------
► Reference Our Blog ►
Blog Post = https://jfams.com/blog/how-i-secure-m...
-------------------------------------------------------------------------
📃Our Website 📃
Jfams Website = https://jfams.com
------------------------------------------------------------------------
Follow Us ! = https://linktr.ee/jfams
------------------------------------------------------------------------
DISCLOSURE ► " This video is intended for educational purposes only and does not replace independent professional judgment. All trademarks and copyrights mentioned in this video remain the property of their respective owners "
“Hey everyone, thanks for watching!
I’m from Indonesia and I’m still learning English, so thank you for your support.
My mother tongue is Bahasa Indonesia, but I’m practicing every day!
Keep learning with me — and I’ll see you in the next video!”