How to Use iOS Router with GNS3

GNS3, a popular network simulator and emulator, allows users to use various router images and emulators to simulate real-world networking scenarios. One of the key features of GNS3 is its ability to emulate Cisco routers, which are widely used in enterprise networks.

In this article, we will explore how to use iOS router with GNS3, including the different methods available for doing so. We will also discuss the various router images that can be used with GNS3 and provide a list of compatible images from different series.

Using Virtual Host with Other Cisco Devices

One way to use an iOS router with GNS3 is by using virtual hosts with other Cisco devices. For example, you can use Juniper routers on GNS3 or simulate the Cisco ASA firewall using PEMU, a special version of Qemu. Additionally, you can also emulate cisco 3700 series IOS, which allows you to use two FastEthernet ports on the motherboard and three sub slots for WICs.

Emulating Cisco Routers

GNS3 emulates various Cisco router images, including those from the 2600, 3600, and 7200 series. For example, the Cisco 2600-MB-2FE image allows you to use one NM slot with up to four Ethernet interfaces or 16 FastEthernet ports. Similarly, the XM series, such as the Cisco 2610XM, 2620XM, 2650XM, 2621XM, and 2651XM, allow you to use two FastEthernet interfaces.

List of Compatible Images

The following are some of the compatible images that can be used with GNS3:

* Cisco 1700 series: This series includes devices such as the 1710, which has only FastEthernet and Ethernet ports.

* Cisco 2600 series: This series includes devices such as the 1721 or 1750, which have a FastEthernet port and two WIC slots with maximum two Ethernet ports and four serial interfaces.

* Cisco 3600 series: This series includes devices such as the CISCO2600-MB-2FE, which allows you to use one NM slot with up to four Ethernet interfaces or 16 FastEthernet ports.

* Cisco 7200 series: This series includes devices that support 15.x images, which are currently only supported by GNS3.

In conclusion, GNS3 is a powerful tool for simulating and emulating various networking scenarios. With its ability to emulate different router images, including those from Cisco, GNS3 provides a comprehensive platform for testing and troubleshooting network configurations. By using virtual hosts with other Cisco devices, emulating cisco routers, and selecting compatible images, you can take full advantage of GNS3's capabilities.

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