My Network Security Journal

Sharing my learning and personal experience in IT Network Security.

Saturday, January 3, 2026

FortiGate 1800F and How to Check Transceiver Serial Number

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Here's a Fortinet link for the FortiGate 1800F series data sheet. The FG-1800F front chassis has 1x RJ45 / USB CONSOLE port, 2x GigE RJ...
Friday, December 5, 2025

Configure Cisco SSH Diffie Hellman Size

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Here's a Cisco link  to improve SSH protocol in a Cisco device. One of our Cisco switch was flagged for using a weak SSH protocol. I har...
Friday, October 3, 2025

Configure SSH Key in Cisco Nexus Switch

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Here's a Cisco link  to properly configure SSH in a Cisco Nexus switch. The Nexus switch use a default 1024 bit SSH/RSA key. The correct...
Saturday, September 6, 2025

Disconnect SSH Session in Cisco ASA

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The Cisco ASA firewall supports up to 5 concurrent SSH login or users. I've received a report that some users couldn't login to the ...
Sunday, August 3, 2025

Cisco ASA Firewall Global ACL

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Refer to this link regarding the  Global ACL in a Cisco ASA firewall and below are some its caveats. Global access policies are networ...
Wednesday, July 2, 2025

Factory Reset a Cisco ASA Firewall in Mutiple Context

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To factory reset a Cisco ASA firewall in Multiple context mode, you'll need to issue a "write erase" then "reload" u...
Thursday, June 5, 2025

Hardening a FortiGate Firewall using Copilot AI

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I used the Microsoft Copilot AI tool to help generate a list or steps in "hardening" a FortiGate firewall. Below are the results ...
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John Lloyd Lagura
I'm John Lloyd Lagura, a passionate Network Engineer, tech blogger and a lifelong learner. I specialize in routing, switching, security, wireless and cloud technologies. I currently hold CompTIA Network+, Security+, ITIL Foundation, Cisco CCNP Security, CCNP Enterprise, CCNA Cyber Ops, Juniper JNCIA-Junos, JNCIA-SEC, JNCIA-Design, Fortinet Network Security Professional (NSE4).
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