My Network Security Journal

Sharing my learning and personal experience in IT Network Security.

Saturday, March 26, 2022

Troubleshoot High CPU and Dispatch Unit in a Cisco ASA Firewall

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You can issue the following commands in order to troubleshoot a high CPU problem and Dispatch Unit Error in a Cisco ASA firewall: show ...
Thursday, February 10, 2022

Cisco VRF Aware IPSec crypto keyring command

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Here's a good Cisco link for the VRF Aware IPSec configuration. You can configure multiple pre-shared key (PSK) and peer address under ...
Tuesday, January 25, 2022

Cisco ASA failover key Command

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I needed to add the failover key <KEY> command in a Cisco ASA firewall pair. The failover pair is working but the previous admin forg...
Friday, October 15, 2021

Cisco ASA Mutiple Context-Based ASA Firewall login Command

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Here's a link about AAA and local username database in a Cisco ASA Multiple mode/Context-based Firewall. You should use the login comm...
Sunday, July 4, 2021

Configuring Objects in a Cisco ASA Firewall

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Here's a link about Cisco ASA Objects. I needed to "harden" our SIP connection to an external SIP gateway in the Internet. So...
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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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