network – macOS inserting DNS servers which are not in DHCP response

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I used Wireshark to confirm the DHCP response packet has only the IPv4 addresses which I have configured on my home router.

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macOS seems to be occasionally (but didn't this time) inserting Google IPv6 addresses, preventing my PiHole from blocking things.

<my ipv4 DNS1>
<my ipv4 DNS2>
2001:4860:4860::8888
2001:4860:4860::8844

How can I prevent this?

Author: Subham

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