this post was submitted on 21 Jul 2023
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We had a situation at a shared space here where an OpenWRT client device accidentally somehow managed to announce itself into the network in a way that its v6 local link address (
fe80::) got inserted into /etc/resolv.conf as a third DNS option (with the first two being the ones from DHCP) and then served incorrect records when queried. What mechanism is that and were the engineers who designed that feature on drugs? Also, how can I tell my Linux system to not accept such announcements?