How to Run a DNS Ad Blocker with W5500 Ethernet on ESP32-S3?
ESP32_AdBlocker is an Arduino-based DNS sinkhole that blocks ads and trackers by answering blocked DNS queries with 0.0.0.0,
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Components
Hardware components
WIZnet - W5500
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Project description
What the Project Does At runtime, the firmware listens for DNS requests from your LAN (typically UDP/53). For each query: It normalizes/parses the requested domain name. It checks whether the domain is present in the locally stored blocklist (downloaded and periodically refreshed). If blocked (or not resolvable per the project’s logic), it returns 0.0.0.0 so clients can’t reach the target host. Otherwise it resolves the domain through configured upstream DNS servers and replies with the resolved IPv4 address. Operationally, the project is designed for large lists: it expects PSRAM (and calls…
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