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feat(nextdns): guard against DNS rebinding, verify tailnet resolution - #18
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Abort sync when Main has dnsRebinding enabled (blocks CGNAT answers, broke all tailnet names on 2026-10-06). After sync, resolve a tailnet record over DoH on every profile and error unless it lands in 100.64.0.0/10. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Aborts sync if Main has dnsRebinding on; after sync, DoH-resolves a tailnet name on all profiles and errors unless in 100.64.0.0/10. Check name is the TAILNET_CHECK_NAME constant.