nanog mailing list archives
Re: Register.com DNS hosting issues
From: Florian Weimer <fw () deneb enyo de>
Date: Sun, 05 Apr 2009 01:02:06 +0200
* Randy Bush:
IMHO, fate-sharing as a strategy for increasing availability is somewhat underrated.from rfc 2182
Randy, I didn't write, "don't keep off-site name servers". I wrote, "keep on-site name servers, even if you pay for off-site name service".
3.3. A Myth Exploded
+ While positive DNS results are usually cached, the lack of a result is not cached. Thus, unnecessary inability to resolve creates an undesirable load on the net.
This has been corrected in some implementations since then.
It is important that there be nameservers able to be queried, available always, for all forward zones.
Not answering crap queries (such as queries to addresses for which the resolver has a good reason to believe that they are still unreachable) tends to increase network load, but in some cases, it's the only way to make people notice the problem (like flooding servers with identical queries at an 1/RTT rate). It pushes some of the hurt to a place where it can be addressed. But looking back at incidents such as the Zonelabs/Abovenet issue, your advice is correct for the network we have today. However, we're really covering up a resolver implementation issue, nothing more.
Current thread:
- RE: Register.com DNS hosting issues, (continued)
- RE: Register.com DNS hosting issues Clinton Popovich (Apr 03)
- Re: Register.com DNS hosting issues Jack Bates (Apr 03)
- RE: Register.com DNS hosting issues Jeffrey Negro (Apr 03)
- Re: Register.com DNS hosting issues Seth Mattinen (Apr 03)
- Re: Register.com DNS hosting issues Charles Wyble (Apr 03)
- Re: Register.com DNS hosting issues Jared Mauch (Apr 03)
- Re: Register.com DNS hosting issues Peter Beckman (Apr 04)
- Re: Register.com DNS hosting issues Brandon Galbraith (Apr 04)
- Re: Register.com DNS hosting issues Florian Weimer (Apr 04)
- Re: Register.com DNS hosting issues Randy Bush (Apr 04)
- Re: Register.com DNS hosting issues Florian Weimer (Apr 04)
- Re: Register.com DNS hosting issues Randy Bush (Apr 04)
- Re: Register.com DNS hosting issues Florian Weimer (Apr 04)
- Re: Register.com DNS hosting issues Randy Bush (Apr 03)
- Re: Register.com DNS hosting issues Jorge Amodio (Apr 03)
- Re: Register.com DNS hosting issues Steven M. Bellovin (Apr 03)
- Re: Register.com DNS hosting issues Paul Ferguson (Apr 03)
- RE: Register.com DNS hosting issues Clinton Popovich (Apr 03)
- Re: Register.com DNS hosting issues Matt Baldwin (Apr 03)