My Network Security Journal
Sharing my learning and personal experience in IT Network Security.
Sunday, February 1, 2026
Check the FortiGate NAT Session Count Using Filters
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Here's a quick way to check the FortiGate NAT session count and filter the NAT IP pool via the get sys session list | grep -c CLI comma...
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...
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