At the risk of wading into a conversation topic that is clearly spiraling, I will offer that the item in question is option number 42 in the DHCP protocol, and is commonly used.
There are a wealth of options in DHCP, which you can read about here: https://datatracker.ietf.org/doc/html/rfc2132 RFC 2132: DHCP Options and BOOTP Vendor Extensions datatracker.ietf.org If you would prefer a prettier formatted version, you can read the Wikipedia article here: https://en.wikipedia.org/wiki/Dynamic_Host_Configuration_Protocol Best, Denny
