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Configuring a Transparent Firewall on the ASA
We learned the first lesson of transparent-mode firewalls the hard way, live, mid-command. Typing firewall transparent on our
Labs
Hands-on Cisco IOS XE lab walkthroughs. Each lab ships with a real CML topology, configs you can paste, and verified show output. Articles tagged Labs cover the full CCNA 200-301 blueprint across Network Fundamentals, Network Access, IP Connectivity, IP Services, and Security Fundamentals.
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TCP Normalization on the ASA: The Silent Connection Killer
Some of the hardest firewall tickets sound like ghost stories. A connection that works fine between two hosts dies the
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Custom L7 Inspection on the ASA: Regex, Match Conditions, and Blocking What You Choose
This is where the ASA stops being a Layer 4 gate and starts reading your web traffic. In this article
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Deep Packet Inspection on the ASA: Application Inspection Engines in Practice
A stateful firewall that only reads Layer 3 and Layer 4 headers is half a firewall. It can decide whether
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The ASA Modular Policy Framework (MPF): class-map, policy-map, service-policy
If you have ever stared at an ASA configuration and wondered how a single firewall applies HTTP inspection here, a
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Choosing ASA High Availability: Failover vs Clustering vs Contexts
The Cisco ASA offers a whole family of high-availability and scale features: failover in two flavors, redundant interfaces, EtherChannel,
ASA
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ASA Clustering Explained: Spanned vs Individual Interface Mode
Failover gives you two firewalls acting as one for redundancy. Clustering takes that idea and scales it out: up to
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ASA Resource Classes: Stopping One Context From Eating the Firewall
Once you slice a Cisco ASA into multiple security contexts, you have created a shared-resource problem. All those virtual
ASA
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ASA Security Contexts with Shared Interfaces: Classification Rules
Security contexts turn one physical Cisco ASA into many independent virtual firewalls, each with its own interfaces, policies, and administrators.
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ASA Active/Active Failover: Failover Groups and Asymmetric Reality
Active/Active failover is the design people reach for when Active/Standby feels wasteful: instead of one firewall doing all
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EtherChannel on the Cisco ASA: Port-Channels, LACP, and Failover Interaction
EtherChannel is the feature that lets a Cisco ASA treat several physical links as one fat pipe: more bandwidth when
ASA
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ASA Redundant Interfaces: The Simplest Link HA You Can Configure
When people talk about high availability on the Cisco ASA, they usually jump straight to failover: two firewalls, one active,