Does GNS3 have memory?

No persistent memory — sessions don't carry over by default.

What are the best alternatives to GNS3?

Browse the AI Tools Directory for related tools.

GNS3 Review

GNS3 is a free, open-source network simulator that lets IT professionals design, test, and troubleshoot complex multi-vendor network topologies without physical hardware.

Verdict

GNS3 is the industry-standard free network emulator used by students, engineers, and certification candidates worldwide to simulate routers, switches, and firewalls from vendors like Cisco, Juniper, and Palo Alto. Its ability to run real network OS images in virtual environments makes it far more accurate than packet tracers, and its large community provides extensive templates and support. The main tradeoffs are hardware-hungry resource requirements and a setup process that can be complex for beginners.

Best for

GNS3 is best for IT professionals and network engineers who need to design and test network simulations.

At a glance

Free planYes

Login requiredYes

MemoryNo

VoiceNo

Image generationNo

Group chatNo

Mobile appNo

NSFW policyN/A

PricingFree (open source) — GNS3 VM and software are free; real vendor OS images may require separate licenses

Pros & cons

Pros

Free and open source with a massive user community
Supports real vendor OS images for accurate simulation
Widely used for CCNA/CCNP/CCIE exam preparation
Active marketplace of pre-built appliance templates

Cons

Resource-intensive — demands significant CPU and RAM
Initial setup and GNS3 VM configuration can be complex
Dependent on users sourcing their own vendor IOS images

Frequently asked

Is GNS3 free to use?: Yes. GNS3 has a free plan — GNS3 VM and software are free; real vendor OS images may require separate licenses
Does GNS3 have memory?: No persistent memory — sessions don't carry over by default.
Can GNS3 do voice or images?: Voice: no. Image generation: no.
What are the best alternatives to GNS3?: Browse the AI Tools Directory for related tools.

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Notes from users

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