GNS3 is a graphical network simulator that allows you to design complex network topologies and to launch simulations on them.

To allow complete simulations, GNS3 is strongly linked with :

  • Dynamips, an IOS emulator which allows users to run IOS binary images from Cisco Systems.
  • Dynagen, a text-based front-end for Dynamips.
  • Pemu, a PIX emulator.

GNS3 is a excellent complementary tool to real labs for administrators of Cisco networks or people wanting to pass their CCNA, CCNP, CCIP or CCIE certifications.

It can also be used to experiment features of Cisco IOS or to check configurations that need to be deployed later on real routers. This project is an open source product that may be used on multiple platforms, including Windows, Linux, and MacOS X.

Features overview

  • Designing high quality complex network topologies.
  • Emulating Cisco routers and PIX firewalls.
  • Simulating simple Ethernet, ATM and Frame Relay switches.
  • Load and save in Dynagen’s INI-like format.
  • Image export (JPEG, PNG, BMP and XPM).

download latest GNS3 from website:



Download GNS 3 and Cisco 1700,2600,7200 IOS in one pack:
RAR Password :sumptuousworld

Related post: how to download GNS3, then install and getting its work

  1. ramprasad

    hey i am a Information technology student from india.
    i am a CCNA .i am interested in networking ,please tell me the things that i should look out for ,the things that i should learn.

    secondly,we have ns in our practicals.what is the basic use of this simulator ( ia have used some for CCNA)…howis this different.how powerful is this??

  2. Tanweer

    Assalam o Alaikum..

    I am a student of CCNA and I have heard much about this simulator but did not use it. The reason is that i don’t have cisco ios files but as i have found here thats why i will use it Inshallah…


  3. @ramprasad
    GNS3 is just a front-end interface for Dynamips. and what is Dynamips?

    Dynamips is an emulator program that was written by Christophe Fillot to emulate Cisco routers. Dynamips runs on either Linux , Mac OS X and Windows and can emulate the hardware of the Cisco series routing platforms by directly booting an actual Cisco IOS software image into the emulator.It allows users to build complex network topologies to test the functionality of IOS on an desktop PC, without the need of an actual physical Cisco device (Wikipedia.org).
    for detail info, go to here:


    you can search another IOS with Google keyword “intitle:index.of ios parent directory bin”.

    • dinesh

      hi aziz i encountered a problem that i used c2600 ios and used 2621xm routers. i mentioned idle pc value too,.everything went fine. then i opened console and i ws configuring stuffs suddenly its gone i tried openin console it is comin like “connecting to local host” and that window disappearin. not gettin connected again…… plz help me with this…. diniccna@gmail.com

  4. Nikhil


    I am using GNS3 for my MAC OS X. I could not find the IOS image files. Will the same image files work for MAC ? if not, where can I find them ?
    Thanks a lot


  5. Arsalan khan

    Which version of IOS is included in this file and can you tell any website from where i can download switch emulator like GNS3

  6. Tony

    Hi Aziz,
    can you simulate router in linux ? that mean : can we use PC to route packet like cisco router ?
    Your posts are very useful.

  7. Zoon

    Thanks for your kindness!

  8. thanks for cisco 7200 router ios
    i was searching and at last got from here
    thanks thanks

  9. emalcdo

    hey, can you upload the images into any other free hosting account? i have problems in rapidshare… thanks

  10. Hotdy

    Terimakasih banyak bro…

  11. hosting account? i have problems in rapidshare… thanks

  12. M

    Excellent — was having trouble with configuring GNS since last couple of days. Turns out that I didn’t have the right images. This works like a charm.

  13. purplechap

    what r the most good ways to say thank you to anyone who help you?? i don’t know.
    so let me say in a common way.
    you really made my day.

    God bless you

  14. srijoko

    thanks. i have dowloaded it and want to try it.

  15. thank you, this information is very interesting ..

  16. Hassan

    C7200,C3745,C3725,C3640,C2691,C2600, PIX with serials IOS images for GNS


    • AM

      Something happened with rapidshare.com. Could you take somewhere else this file, because I couldn’t dowload it.
      Thank you

  17. sajith

    thank you…..guys this is aswm and work perfect

  18. azam

    Hello does anyone know which ios on which platform supports EIRGP ipv6 routing.

    Thank you

  19. ROSHAN

    This guy is a real life saver ..thanks

  20. Pradeep

    Can someone help to find out the IOS for the netscreen for GNS 3 ?

  21. hared

    Guys can sumbudy tell me the password to extract the .rar file that contains all these ios images

  22. sanga

    I need also the password to extract the rar.file

  23. prayugo

    i need junos for juniper router in this aplication,can you tell me about link for that? tks

  24. ilyan syaputra

    aslkm. mau minta tolong gimana cara download ios imagenya?? saya masih bingung. terimakasih

  25. john peterson

    the password to unzip the rar file is “sumptuousworld”

  26. bharat


    i was downlaod this software from this link but this softawre zip file protected by password so send me password.

  27. manish

    any one help me ios images for switch in gns3

  28. rony

    can we use layer three swith ? in GNS 3 cuz only routers are availbe in software if yes so how to get switch in software

  29. dumi

    thx a lot.finally i found it. i think it’s very useful for me.

  30. Serafin

    Hi Dude,

    Many Thanks to you!

  31. good work

    thank you

  32. Abhilash Menon

    thank for the GNS 3 .Had to wait for 2 days to get it .any 1 has 3700 tooo

    Once again thanx to all

  33. luas

    thanks a lot guys.

  34. blessing

    pliz can anyone help me with ios images for gns3.send me the info to email:blessingsanyanga@gmail.com

    send me the links where i can get the free ios images

  35. blessing

    i dont know what to do with gns.can anyone help me with how to use it.also stuck coz dont know where to get ios images for it.iam about to start my ccnp today 2nd april

    can anyone kindly attach to my email ,the links to where i can get the ios images.email is:blessingsanyanga@gmail.com

  36. ali yousif


  37. Domokun

    FYI, *****You CAN’T emulate Cisco Switches***** in GSN3.

    But you can install the nm-16esw in some of the routers slots(Don’t know what that is then look it up). *Note* you won’t get all the functions of say a real c3550. But hay its better then nothing. Also search the torrent sites for the iso’s… there are huge packs with routers, PIX, ASA and IDS… Look people there out there!

  38. Rhai

    This had been the best, BOSON s*cks!!! Availing Software that is useless is kinda shi*ty!

  39. vinod

    thank your for giving me the IOS images of GNS3

    very very thank you aziz

  40. guiu_prado

    Man!!!! very tks!!!! NICE!!!

  41. Ohireme

    Pls., can anyone who have d cisco router ios. Pls attach & sent 2 my email addres. I have d gns3 software 4 windows. But need the ios. Thks


    Hi Aziz,

    Thank for you very much for this post

  43. dinesh

    hi aziz thank u so much fr this help.. i hv a doubt that shud we mention odle pc value for every router or is it enough to mention it for one router….. plz help…. and can we directly ad this ios image or shud we decrypt it…..

  44. dinesh

    hi aziz i encountered a problem that i used c2600 ios and used 2621xm routers. i mentioned idle pc value too,.everything went fine. then i opened console and i ws configuring stuffs suddenly its gone i tried openin console it is comin like “connecting to local host” and that window disappearin. not gettin connected again…… plz help me with this…. diniccna@gmail.com

  45. charles

    good evening for all i’m charles and this is my first time to use gns3 i v passing more dificulties to install gns3 at now i would like to get ios cisco c3640 router . i just look it for more web site but i did’nt find,so i asking at all if someone can send me this ios cisco on my email:charlylandry56@yahoo.fr. tank’s u

  46. budi

    very2 generous man..
    helpfull for newbie like me just starting out cisco ios
    matur nuwun mas :-)

  47. Prateek

    May god bless you sir, thanks a lot :D

  48. kumar

    thanks for uploading the ios images guys

  49. Shahbaaz

    hw can use switch as a layer3 in GNS!!!!!


  50. As Mr. Aziz said, GNS3 is a great front end for Dynamips.

    Jeremy Grossmann, Benjamin Marsili, Claire Goudjil and Alexey Eromenko(all french men) are the main brains behind GNS3.

    I remember how much I struggled using Boson Cisco CCNA/CCNP software and Cisco Packet Tracer software to learn CCNA topics. But Boson and packet tracer are half baked and you cannot run all the Cisco IOS commands in these software.

    You can run Cisco Router IOS on GNS3 to practice CCNA, CCNP and CCIE routing lessons.

    Only trouble is GNS3 cannot run Switching part. You still need to depend Cisco Packet Tracer for CCNA CCNP Switching part and real Cisco Switches for CCIE Switching part.

    Sad… I wish some how we could run Switching also in GNS3…

    You can download GNS3 from below location (GNU GPL license)


    You can download files which you require for GNS3 from below links. You may need to register and sign in.



    Thank you all…

  51. saalam

    I need asa5510 ios and sw2960 and sw3750 cisco ios image for gns3.please help me.
    my email:robatsaz@gmail.com
    Thank you

  52. Thoko

    Hey guys,how can i run linux ubuntu on a windows machine.please somebody help me and thanks in advance

  53. Yes! Finally something about ios 7.1.0.

  54. I’m not sure where you’re getting your information,
    but great topic. I needs to spend some time learning much more or understanding more.
    Thanks for wonderful information I was looking for this information for my mission.

  55. I think the admin of this website is in fact working
    hard in favor of his website, as here every data
    is quality based data.

  56. vizcom13@gmail.com mail me if u need all ios for gns3………. +23345920292 is my number for installation u can call for guidelines for it

  57. Very energetic post, I enjoyed that bit. Will there
    be a part 2?

  58. Hello there, You have done a great job. I will certainly digg
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  59. pnoy

    can someone help me about the cisco 1721 ios image? where can i download it?

  60. pnoy

    pleasee sir help me!

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