New house is in progress and that also means bring back PiHole running in a Raspberry Pi. If you don’t know PiHole, this may help:
Pi-hole or Pihole is a Linux network-level advertisement and Internet tracker blocking application which acts as a DNS sinkhole and optionally a DHCP server, intended for use on a private network. It is designed for low-power embedded devices with network capability, such as the Raspberry Pi, but supports any Linux machines.PiHole
I turned this on yesterday and after a few hours of use, I got more than 40% of blocked queries in my network.
And one of the domains was going up fast in the top 3: self.events.data.microsoft.com
The domain is in one of the blocked url lists, however it seems to be crucial to work with office. The official documentation shares more details about this endpoint:
The following endpoints are used to connect to the Microsoft 365 admin center’s shared infrastructure, including Office in a browser. For more info, see Office 365 URLs and IP address ranges. You can turn this off by removing all Microsoft Office apps and the Mail and Calendar apps. If you turn off traffic for these endpoints, users won’t be able to save documents to the cloud or see their recently used documents.
Similar behavior affects to the 2nd and 3rd endpoint, so I decided to enable them in PiHole. I’ll keep an eye on them, and let’s see how my home network works !
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