![]() If the query matches one of the known block rules, it will refuse to resolve the IP address for that query, thus stopping that URL from loading altogether. Like all ad blockers, AdGuard Home contains a list of known advertising, tracker or malicious domain names which it uses as a lookup table whenever a DNS query is made. Another boon for this is that web pages which attempt to detect ad blockers (and then block the content until you turn the blocker off) won't know you're blocking their ads, as the content rejection is occurring elsewhere. ![]() Network-level ad blockers provide a greater benefit when compared to a device-specific ad blocker because you are able to create blanket rules for all devices on your network, making such configuration much simpler. By doing this, AdGuard Home now has carte blanche to decide which DNS queries are allowed and – more importantly – which one's aren't.ĪdGuard Home is effectively a DNS proxy, whereby it acts as your network's primary DNS nameserver, filters requests, then relays the requests that satisfy its filters to an "upstream" DNS nameserver, which does the real DNS resolution. When you're running it on your network, you can configure your router's DHCP service to tell all network clients to use AdGuard Home's IP address as the DNS nameserver instead. Some ISPs will configure their routers to make DNS queries to their own DNS servers. There are thousands of DNS servers out there, but the most common ones people will likely use are Google's public DNS servers (8.8.8.8 and 8.8.4.4) or CloudFlare's (1.1.1.1 and 1.0.0.1). It is entirely possible to override this on the device, but for the most part people won't do this. With that lease, it also provides your device with the DNS nameservers that it should be using. Whenever your device connects to your home network (or any network, really) your router's DHCP service will provide your device with a lease on an IP address. Every request for a website requires this look-up.īut how do your devices know which DNS servers to call for each request? Well, that's generally DHCP's job. In order to determine this IP address, it makes a DNS ( domain name system) query to a DNS nameserver which will respond with a DNS record for that domain, containing its IP address (and usually some other information). Whenever you navigate to a website using its domain name (, for example), your device needs to know which IP address that domain refers to so it can load its content. ![]() To understand how AdGuard Home works, you should first understand how your devices make requests out of your network to the internet. If you know how DNS works, you may skip this part, but as a quick refresher. ![]() Its primary goal is to provide your network with a mechanism to actively block certain requests that websites you visit make – in this case, requests for adverts, malware, or various other malicious things. In short, AdGuard Home is much like your run-of-the-mill browser ad blocker, but rather than being a plug-in on your favourite web browser, AdGuard Home is a fully-fledged server application which runs on a separate machine somewhere on your network (or perhaps even on a VPS you own). It's a self-hosted variant of AdGuard's own subscription DNS service. However, after having spotted some discussion on our Discord server-and coincidentally during our rebooted podcast-about a new player on the field, I decided to give AdGuard Home a go. Like most people (I assume), I stuck to browser plugins like AdBlock Plus and uBlock Origin. While many members of the LinuxServer.io team currently use PiHole for their ad-blocking needs, I was relatively late to the game having never used a network-level DNS blocker.
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