A device that is setup for DHCP but is pulling information that isn’t included with what is assigned in the DHCP scope is more likely a case of the devices connecting to a rogue DHCP server. This DHCP server is placed there without the authorization of the IT staff and can be used for malicious purposes.
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What is a Rogue DHCP server?
What is DHCP and how does it work?
What are the consequences of using an IP address outside the DHCP range?