My Network Security Journal

Sharing my learning and personal experience in IT Network Security.

Wednesday, January 8, 2025

FortiGate Direct Firmware Upgrade

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You can "safely" upgrade the FortiOS directly to the target firmware code if it's brand new and since it still has a default c...
Friday, December 6, 2024

Troubleshoot FortiGuard Server Connectivity

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Here's a Fortinet link in troubleshooting FortiGuard server connectivity over the Internet. I was configuring a new FortiGate firewall ...
Sunday, November 10, 2024

Create a Fortinet Support Ticket

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Here's a Fortinet link for device hardening and best practice in a FortiGate firewall. To create a new Fortinet support ticket, go to t...
Saturday, October 5, 2024

Cisco GRE Tunnel Keepalive

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This Cisco link covers the GRE Tunnel and how a keepalive works. I got a GRE over IPSec VPN configured between Singapore and London. The GR...
Friday, September 6, 2024

Cisco ASA Firewall SNMP OID

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There's a "hidden" Cisco ASA CLI command in order to retrieve the SNMP MIB OID info without performing an SNMP walk from a rem...
Friday, August 2, 2024

Cisco Firepower FX-OS show tech-support

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We've encountered an outage in our Cisco FPR 2100 High Availability (HA) pair running ASA OS. The Primary ASA firewall crashed or auto r...
Friday, July 5, 2024

Changing a Cisco Switchport Mode From Access to Trunk

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I had to reconfigure a Cisco switchport mode from access to a trunk in order to run multiple VLANs in a Cisco ASA firewall interface. I conf...
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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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