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DNS failover path
Live demo for test.failover.nebuladns.net — authoritative on ns1/ns2.nebuladns.net, CNAME flips between edge POPs with low TTL.
You landed on
detecting…
POP that served this page
DNS says now
…
TTL —
lon1 /healthz
…
lon2 /healthz
…
What this proves
| Hostname | test.failover.nebuladns.net |
|---|---|
| Authoritative NS | ns1.nebuladns.net (72.62.211.28), ns2.nebuladns.net (85.190.106.88) |
| Record | CNAME · managed TTL 30s (expect ~60–90s client visibility after flip) |
| Primary | lon1.pop0.uk → 195.20.255.201 |
| Secondary | lon2.pop0.uk → 85.190.106.189 |
| Controller | nebula-dns-failover on both NS hosts · probes /healthz every 10s · 3 consecutive fails → flip |
| Reference pilot | abtesting.fictionally.org (same POP pair; Cloudflare or Nebula provider) |