FIxing IOU Keygen Error (Running IOS on Linux in Eve-NG)

If you keep getting this error when generating key as license for  running IOL or IOS On Linux, (also called IOU or IOS On Unix) in EVE-NG

darwin@eve-ng:/$ cd /opt/unetlab/addons/iol/bin

darwin@eve-ng:/opt/unetlab/addons/iol/bin$ python keygen.py
*********************************************************************
Cisco IOU License Generator - Kal 2011, python port of 2006 C version
hostid=bada0c0f, hostname=eve-ng, ioukey=bada0e51
Traceback (most recent call last):
  File "./keygen.py", line 18, in <module>
    md5input=iouPad1 + iouPad2 + struct.pack('!i', ioukey) + iouPad1
struct.error: 'i' format requires -2147483648 <= number <= 2147483647

Step 1:
Solution: Modify the python script, change i to L

From: md5input=iouPad1 + iouPad2 + struct.pack('!i', ioukey) + iouPad1

To:     md5input=iouPad1 + iouPad2 + struct.pack('!L', ioukey) + iouPad1

Run again:

darwin@eve-ng:/opt/unetlab/addons/iol/bin$ python keygen.py

*********************************************************************

Cisco IOU License Generator - Kal 2011, python port of 2006 C version

hostid=bada0c0f, hostname=eve-ng, ioukey=bada0e51

Step 2: Add the following text to ~/.iourc:

[license]

eve-ng = f2630dfba88daedd;

You can disable the phone home feature with something like:

 echo '127.0.0.127 xml.cisco.com' >> /etc/hosts

Step 2: Input the license key in "iourc" file

vi iourc

[license]

eve-ng = f2630dfba88daedd;

Step 3: Test IOL

darwin@eve-ng:/opt/unetlab/addons/iol/bin$ LD_LIBRARY_PATH=/opt/unetlab/addons/iol/lib /opt/unetlab/addons/iol/bin/i86bi-linux-l3-adventerprisek9-15.4.2T.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

wwwin-iou.cisco.com 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.

           cisco Systems, Inc.

           170 West Tasman Drive

           San Jose, California 95134-1706

Cisco IOS Software, Linux Software (I86BI_LINUX-ADVENTERPRISEK9-M), Version 15.4(2)T, DEVELOPMENT TEST SOFTWARE

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2014 by Cisco Systems, Inc.

Compiled Thu 27-Mar-14 01:08 by prod_rel_team

This product contains cryptographic features and is subject to United
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