Have you ever built an Ubuntu virtual machine image, only to boot it up and find that you instantly had duplicate IP addresses on your network? Maybe you searched around and ran some random commands to fix the immediate trouble, but never had the time to really dig into the cause of the issue.
In this video, we take a deep, packet-level look at the cause of this problem. We’ll look at how duplicate host IDs result in duplicate DHCP client identifiers and the problems this causes. We’ll inspect RFCs, packet captures, and server logs to understand the impact of duplicate DHCP client IDs on a network. By understanding the root of the problem, you’ll be able to decipher the available solutions.
VIDEO CHAPTERS
00:00 – Intro
00:14 – Overview and Background
00:37 – Environment Setup
01:07 – Problem Background
03:22 – The First DHCP Client
04:32 – A Cloned DHCP Client
05:27 – Analyzing a Packet Capture
07:27 – Systemd Networkd
08:23 – The Machine ID
08:54 – Practical Implications
09:40 – A Packet Capture with dhclient
10:45 – Netplan with Systemd Networkd
11:52 – Conclusion and Outro
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Thanks! That's what I was looking for. Very clear!
Thanks – I would prefer to change hostname of the cloned VM before running the dhclient. Not sure how to change UUID of the VM.