| Simple answer: 1) Spend money. 2) Get a different provider. Beyond that, get free help or advice. I guess that's what you're attempting now. Let's start with spending money. You need to convince somebody that it's worth it. (Know your assets, know your risks, etc.) If it's not worth it or it's killing the company, and they won't do anything about it except to send you out to beg for help: get another job. Seriously. As for the provider and "DOS": put their balls in a vice. What kind of DOS, exactly? What mitigations do they employ, exactly? Are they visibly seeking advice and assistance? Where's their outage page? I (charitably) assume you're being coy because you don't know... not because you're just being coy. Get the facts; cache la poudre; name and shame them. Who else is affected? Band together, share notes and intelligence. Openly. Fully. Go read some of the DNS server mailing lists and dns-ops. If you can't swim in those waters, go home. Hide, and hope they go away. Most of the answers here are akin to poking a dead beached whale: "smells bad!" "look, there's its liver!" "that's the blowhole, that's how it breathes" "looks like a propellor strike": factual, but not gonna help the whale. I'm baffled by the premise of your question: exactly how does this lead to needing to do "redundancy" correctly? Is the provider not doing it correctly? No evidence is provided to support the assertion. Reachability and services: there are a lot of tactical measures depending on how services are hosted. Mirroring the domain is a tool in the arsenal, depending on your line of business and communications needs (monitoring a SCADA system for emails to make sure the nuke doesn't melt down is different from some rando wanting to return a party dress). "multiple nameservers": anycast is a thing. Ummm... mirroring the domain ("just 'copies'": WTF?) IS maintaining an NS. I'm not going to assume anything about your TTL. Name the domain. Tell me the TTL. Let me confirm it. ("simply increase the TTL": WTF? I think "simple" is the important word there. None of this is simple.) -- m3047 | FWM6, internet plumber |