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How to Add Cisco IOU and IOL Images To EveNg

Add Cisco IOU and IOL Images To EveNg

Step by Step process to add Cisco IOU and IOL Images to Eveng. L2/L3 images of Switches and routers which helps you to practice for L3 devices with the same features and functions which original devices have. Cisco IOU/IOL images were released for Architecture and testing purposes but today Cisco IOU/IOL images are used for CCIE routing and switching practice for CCIE routing and switching.

Eve-ng is one of the best emulators to Practice with Cisco IOU/IOL images, where you can import the image in Eve-ng and access it via GUI. You can set up your own lab and practice as much as you want.
To install Eve-ng on your desktop check below Post-
How to install Eve-ng on Vmware.

We will explain to you the step-by-step process – of adding Cisco IOU and IOL images to Eve-ng and how to license them.

Follow the Video to add cisco IOU and IOL images to Eveng

if you want to practice Cisco ASA or Cisco IOS Dyanamip on eve-ng for your certification or knowledge then check the below posts-

How to add Cisco ASAv to Eve-ng
How to add Cisco IOS (Dynamips Images) to Eve-ng

1. Supported Cisco IOU/IOL Images for Eveng

Basically, Eve-ng support all the Cisco IOU/IOL images but below are recommended one.

TypeEVE Image NameVersionvRAM
L2L2-ADVENTERPRISEK9-M-15.1-20130726.binI86BI_LINUXL2-ADVENTERPRISEK9-M 15.1(20130726:213425)192

2. Download Cisco IOU/IOL Images for Eve-ng

Images provided below are strictly for educational purposes and are not hosted on the server. We are just indexing the links found on the internet for educational purposes only.

You can download Cisco IOU/IOL images from the below links.
1. Download Cisco IOU/IOL Images.

3. Add Cisco IOU/IOL images to Eve-ng

IOL or IOS On Linux also called IOU or IOS On Unix. IOL is a simulator available for Cisco internal use only. IOL refers to the Linux version, compiled for i386 architecture. IOU refers to the Unix (Solaris) version compiled for Sparc architecture. The term IOU usually refers to IOL too.

Because IOL is an internal IOS version, IOL can be used by Cisco employees or by authorized customers only.

Upload the downloaded image to the EVE using for example FileZilla or WinSCP to:  /opt/unetlab/addons/iol/bin

Type the following command to fix permissions:

/opt/unetlab/wrappers/unl_wrapper -a fixpermissions

3. License for Cisco IOU/IOL images.

#! /usr/bin/python
print("Cisco IOU License Generator - Kal 2011, python port of 2006 C version")
print("Modified to work with python3 by c_d 2014")
import os
import socket
import hashlib
import struct

# get the host id and host name to calculate the hostkey
hostname = socket.gethostname()
for x in hostname:
 ioukey = ioukey + ord(x)
print("hostid=" + hostid +", hostname="+ hostname + ", ioukey=" + hex(ioukey)[2:])

# create the license using md5sum
iouPad1 = b'\x4B\x58\x21\x81\x56\x7B\x0D\xF3\x21\x43\x9B\x7E\xAC\x1D\xE6\x8A'
iouPad2 = b'\x80' + 39*b'\0'
md5input=iouPad1 + iouPad2 + struct.pack('!i', ioukey) + iouPad1

print("\nAdd the following text to ~/.iourc:")
print("[license]\n" + hostname + " = " + iouLicense + ";\n")
print("You can disable the phone home feature with something like:")
print(" echo '' >> /etc/hosts\n")
Cisco IOU License Generator - Kal 2011, python port of 2006 C version
Modified to work with python3 by c_d 2014
hostid=007f0101, hostname=eve-ng, ioukey=7f0343 Add the following text to ~/.iourc:


eve-ng = 972f30267ef51616;

Now, we will create licenses for IOU/IOL images

nano - c iourc

paste the license and press ctrl+x to save

eve-ng = 972f30267ef51616;

We have successfully added the Cisco IOU/IOL images to eve-ng with the license.

5. Testing Cisco IOU/IOL images in Eve-ng

cd /opt/unetlab/addons/iol/bin
touch NETMAP
LD_LIBRARY_PATH=/opt/unetlab/addons/iol/lib /opt/unetlab/addons/iol/bin/<iosname.bin> 1
IOS On Unix - Cisco Systems confidential, internal use only
Under no circumstances is this software to be provided to any
non Cisco staff or customers.  To do so is likely to result
in disciplinary action. Please refer to the IOU Usage policy at for more information.

              Restricted Rights Legend

Use, duplication, or disclosure by the Government is
subject to restrictions as set forth in subparagraph
(c) of the Commercial Computer Software - Restricted
Rights clause at FAR sec. 52.227-19 and subparagraph
(c) (1) (ii) of the Rights in Technical Data and Computer
Software clause at DFARS sec. 252.227-7013.

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           170 West Tasman Drive
           San Jose, California 95134-1706
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