Here I am listing all the working versions of Cisco IOS which I have tested with the latest version of GNS3. Feel free to download them and use them for your Cisco certifications studies. • 1700 – • 2600 – • 2691 – • 3640 – • 3660 – • 3725 – • 3745 – • 7200 (v15) – • 7200p (v15) – Mirror Links: 1. If you face any problem setting it up with GNS3 drop me a message and I will get back to you asap. GNS3 is an open source (GNU GPL) software that simulates complex networks while being as close as possible from the way real networks perform, all of this without having dedicated network hardware such as routers and switches.

How to Download Cisco IOS Images for GNS3 Download GNS3 Supported IOS SYSNETTECH Solutions. 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.

GNS3 provides an intuitive graphical user interface to design and configure virtual networks, it runs on traditional PC hardware and may be used on multiple operating systems, including Windows, Linux, and Mac OS X. In order to provide complete and accurate simulations, GNS3 actually uses the following emulators to run the very same operating systems as in real networks: • Dynamips, the well known Cisco IOS emulator.

• VirtualBox, runs desktop and server operating systems as well as Juniper JunOS. • QEMU, a generic open source machine emulator, it runs Cisco ASA, PIX and IPS. GNS3 is an excellent alternative or complementary tool to real labs for network engineers, administrators and people studying for certifications such as Cisco CCNA, CCNP andCCIE as well as Juniper JNCIA, JNCIS and JNCIE.

Enjoyed this post? Hello Srijit, I’ve been having a hard time using the 7200 image (c7200-advipservicesk9-mz.152-4.S5.bin) in GNS3, and getting my laptop to find a valid Idle PC value. I’ve even tried to download the image for the 7200 from the link you’ve provided above #8.

Still getting the message “0xa000 is not a valid Idle PC value”. The only other 7200 image I’ve used and gotten a valid PC value is c7200-jk9s-mz.124-13b.bin, but when using that image, I’m getting some odd results when configuring various things such as GRE tunnels.

Can you assist me with this? Hello Sir, I have downloaded the image for 7200. However, in GNS3 when I do show flash on the router I get the following message – R1#show flash Open device slot0 failed (No such device) (Try device DISK: for ATA media.) R1#show disk0 No files on device 67104768 bytes available (968 bytes used) R1#show file system File Systems: Size(b) Free(b) Type Flags Prefixes – – opaque rw system: – – opaque rw tmpsys: – – opaque rw null: – – opaque ro tar: – – network rw tftp: – – opaque wo syslog: 554 nvram rw nvram: * 78 disk rw disk0: – – disk rw disk1: – – flash rw slot0: flash.

Dear Manica, Can you try the steps: 1) change directory to flash: cd flash: Rack1SW3#cd flash: Rack1SW3#dir 2) erase flash: Rack1SW3#erase flash: Erasing the flash filesystem will remove all files! [confirm] Erasing device eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee erased Erase of flash: complete 3) Squeeze flash: Rack1SW3#squeeze flash: Squeeze operation may take a while. [confirm] Squeeze of flash complete Rack1SW3# 4) Try to create vlan again Rack1SW3(config)#vlan 3 Rack1SW3(config-vlan)#exit Rack1SW3(config)#int vlan 3 Rack1SW3(config-if)# To me, resolve my problem.

GNS3 is a multi-platform utility designed from the ground-up to enable users to create simulations of complex networks without having to buy a router or other dedicated equipment. A complex, yet easy-to-use network simulator with a user-orientated interface GSN3 does not only target the advanced users, but also students or people that are passionate about networking, by helping them to gain a better understanding of the connection and layout of routers or computers. In addition, GSN3 comes with a streamlined user interface that has absolutely all the buttons and features arranged at one’s finger tips and will enable the creation, customization and simulation of any network configuration.

Provides a good testing and simulation environment for network operations Moreover, in order to provide its users with the most real simulation of networks, GSN3 uses emulators such as: VirtualBox, Qemu and Dynamips. Furthermore, GSN3 is capable to verify and test the network’s layout, thus enabling you to optimize its functionality. At the same time, GSN3 is able to determine the minimum number of routers required in order to have a balanced network connection. A straightforward network problem solver that will help you in more ways than one When dealing with network problems you can make use of the built in “Take a screenshot” GSN3 feature: this way, you can compare the result of various actions, or provide relevant data about your network when seeking advice. On the whole, GNS3 doesn’t replace a router or a switch device, but it does manage to provide an easy to understand network testing environment by enabling you to simulate various configurations.