EVE-NG (Emulated Virtual Environment-Next Generation) is a powerful tool for network engineers and architects, allowing them to create complex network topologies for testing and learning. However, you might encounter issues when trying to boot up IOL (IOS on Linux) Layer 2 images. In this post, we’ll walk through some common reasons for the IOL Layer 2 image boot-up issue in EVE-NG and how to fix them.
Environment
EVE-NG Community Verison 6.2.0-4 installed under Vsphere ESXi 7.0 Update 3
root@eve-ngcev6:~# dpkg -l eve-ng
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-==============-============-============-==============================================
ii eve-ng 6.2.0-4 amd64 A new generation software for networking labs.IOL license installed correctly.
root@eve-ngcev6:~# vim /opt/unetlab/addons/iol/bin/iourc
[license]
eve-ngcev6 = cxxxxxxxxxxxxxxxxc;Execution persmission is allowed on the images.
Problem
Layer 3 images are working completely fine
Layer 2 IOL image boot for a couple seconds, then stop right away
Troubleshooting
Check the unl_wrapper log to trace the the image wraper log
vim /opt/unetlab/data/Logs/unl_wrapper.txt
Check the image wrapper log to find out the root cause
vim /opt/unetlab/tmp/0/fbaxx92b-27bc-413f-adb8-f8fa2511f08c/3/wrapper.txt
The Fix
After a bit search around:
1. remove xml.cisco.com entry from /etc/hosts file
2. run this command “iptables -I OUTPUT -p udp –dport 53 -m string –hex-string “|03|xml|05|cisco|03|com” –algo bm -j DROP”
3. Try IOL layer 2 image again.
Useful link
www.eve-ng.net/index.php/documentation/community-cookbook/