When a client does not find a DHCP Server, it randomly get an address. This is called APIPA.
This is by design but can be deaktivated by a registry key.
The following registry key can be set to deactivate APIPA. APIPA stands for Automatic Private IP Addressing. After setting this key, cliens keep their last IP address instead of randomising one.
About the Author
Wim Peeters is electronics engineer with an additional master in IT and over 30 years of experience including time spent in support, development, consulting, training and database administration. Wim has worked with SQL Server since version 6.5. He has developed in C/C++, Java and C# on Windows and Linux in different European countries and different European languages. He writes knowledge base articles to solve IT problems and publishes them on the Lubby Knowledge Platform where he is one of the most important contributors and the main developer.