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As I understand it, for Windows computers the AD connector (or maybe the script for the domain controllers?) monitors logins and associates an internal IP address with a user. The virtual appliance uses this IP->user mapping to add information about ...
It's based on EDNS option 20292. Here is an excerpt from some unfinished code that builds these DNS requests with all the custom data. This does not run on it's own, but it should give you a good idea of how it works. The function tests may also prov...