My Network Security Journal
Sharing my learning and personal experience in IT Network Security.
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 ...
Saturday, May 3, 2025
Enable Overlap IP Address in a FortiGate VDOM
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Here's a Fortinet link to enable an overlap IP address in a FortiGate VDOM. I've subnetted a public IP address range and allocated ...
Sunday, April 6, 2025
Configure Cisco Router Crypto Map Based IKEv2
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I had to reconfigure an old Cisco 800 router from a "legacy" Crypto Map (Policy Based) IKE Version 1 to a more secure IKE Version ...
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