Viability of GNS3 network simulation for testing features/configurations.

Hugo Slabbert hugo at slabnet.com
Wed Oct 16 16:35:03 UTC 2019


The alternative or complementary approach is something like batfish[1], for 
validation vs. emulation.

-- 
Hugo Slabbert       | email, xmpp/jabber: hugo at slabnet.com
pgp key: B178313E   | also on Signal

[1] https://www.batfish.org/

On Wed 2019-Oct-16 12:19:31 -0400, Yan Filyurin <yanf787 at gmail.com> wrote:

>This also depends on your scale.  If you have lots of routers, you would end up with lots of compute to run the VM instances.  If you get the compute (which is cheap comparing to actual network hardware), you would need a "cloud orchestration” tool and a a system to connections from host to host like some form of overlay networking.
>
>GNS3 would do a good job, but for something with a bit more orchestration APIs.  There is this:
>
>https://networkop.co.uk/post/2019-01-k8s-vrnetlab/ <https://networkop.co.uk/post/2019-01-k8s-vrnetlab/>
>
>And the nice people who even show up to NANOG every once in a while:
>
>https://www.tesuto.com/ <https://www.tesuto.com/>
>
>There are a few other tools that people built on their own if you scrub GitHub.  I even felt into that trap and exploring VRnetlab.
>
>But numerous things were achieved.  Yes, you would miss out on all the hardware bugs, hardware adaption layer issues and maybe a scale issue or two, but with enough instances, route generators and maybe even some application (some of these things can even forward traffic), you could discover 90% of things that can go wrong.
>
>And you get the flexibility of downloading evaluation images of all kinds of things, so maybe you can avoid spending any money.
>
>Yan
>
>
>
>
>> On Oct 16, 2019, at 12:03 PM, Jason Kuehl <jason.w.kuehl at gmail.com> wrote:
>>
>> I did this at my current company with also using VM Palo Alto.
>>
>> Greeting of testing out a plan to make sure its insane.
>>
>> The key it keeping its all up todate down to the firmware version (I know its not possible for some because virtual)
>>
>> The things this wont find are hardware related faults or issues.
>>
>> On Wed, Oct 16, 2019 at 11:52 AM Ryland Kremeier <rkremeier at barryelectric.com <mailto:rkremeier at barryelectric.com>> wrote:
>> Hello,
>>
>>
>>
>> I’m currently in the process of setting up a near identical network to our own in GNS3 for testing purposes. Has anyone here tried this before to any success? We need to buy the Cisco IOSv image to continue with the sim so I figured I would inquire here first before diving in.
>>
>>
>>
>> All info is appreciated,
>>
>> --
>>
>> Ryland Kremeier
>>
>>
>>
>> --
>> Sincerely,
>>
>> Jason W Kuehl
>> Cell 920-419-8983
>> jason.w.kuehl at gmail.com <mailto:jason.w.kuehl at gmail.com>
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