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How to add Cisco IOS-based devices in GNS3

You S01e03 Bd50 May 2026

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How to install Cisco Adaptative Security Appliance (ASA) in GNS3

The Cisco Adaptative Security Appliance (ASA) is Cisco’s main firewall and network security product. It mainly provides firewall and VPN services, but its native features can be enhanced with the addition of FirePOWER NGIDS services on top of it.

Note

Even when used on top of an ASA in the same appliance, the FirePOWER NGIDS is never really merged within the ASA but stays a separate module. For instance, the ASA and the FirePOWER each have their own separate CLI shell, each with their own different syntax and logic. In fact FirePOWER is not a Cisco development but has been acquired when Cisco merged with SourceFire, hence the (personal) feeling of an “alien” product plugged into the ASA.

For CCNA Security students, while you must know ASA and be comfortable with its usage, as for now you only need to know what FirePOWER is and why it is used …

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How to install Cisco Configuration Professional (CCP) in GNS3

The Cisco Configuration Professional (CCP) is a graphical interface allowing to quickly and easily configure, monitor and troubleshoot Cisco IOS-based devices. It does exactly the same thing as one could do using IOS command-line, but using more convenient graphical tools and optional wizards for multi-steps configuration, including operations involving several devices like setting-up a tunnel.

It comes in two versions:

CCP 2.x, also known as Router and Security Device Manager Software (SDM), it is the little brother of ASDM used to configure ASA firewalls. This is a desktop application, the GUI is installed locally on the user’s host.
CCP “Express” 3.x: this version is deployed on the Cisco devices themselves and leverage devices’ HTTP port to embed a web configuration interface. CCP Express already existed in the 2.x generation, at that time two flavors were available: the “end-user” one with reduced functionalities (the end-result was …

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How to run a CAM table overflow attack in GNS3

Knowing where difference with real gears lies

For performance reasons, a lot of switch things are actually not part of the IOS code but are implemented in hardware. This includes the ARL, or Address Resolution Logic, which provides all the methods to add, remove and lookup entries in the MAC address table.

Therefore, for the NM-16ESW module to work in GNS3, Dynamips had to reimplement all these normally hardware provided services, or at least push this far enough to allow an unmodified IOS to run on it correctly.

The sad thing is indeed that this is unfinished work, as stated in this module’s source code header:

/*
 * Cisco router simulation platform.
 * Copyright (c) 2006 Christophe Fillot (cf@utc.fr)
 *
 * NM-16ESW ethernet switch module (experimental!)
 *
 * It's an attempt of proof of concept, so not optimized at all at this …

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How to add virtual machines (end devices nodes) in GNS3

Virtual machines can be added in GNS3 topologies as end devices nodes and can play various roles:

Lightweight ones are very focused for instance to provide just enough to test the network connectivity or provide a functional browser.

They start blazingly fast and are very light on resources, meaning you can put several of them to test end-user workstation behavior at several places in your topology with little to no worry about the CPU or memory impact.
Dedicated appliances are designed to provide a specific service, like networking (firewall, …), applicative (proxy, email filtering, …) or administrative (monitoring, …) services.

Resource consumption vary greatly depending on the service and the software used by the appliance. However, professional appliances are usually designed to handle a large number of simultaneous operations: some will support with no issue to see the virtual machine resources settings reduced on test environments (some may require a modification in their …

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