nanog mailing list archives
Re: dns and software, was Re: Reliable Cloud host ?
From: Mark Andrews <marka () isc org>
Date: Wed, 29 Feb 2012 12:46:56 +1100
In message <CAP-guGXK3WQGPLpmnVsnM0xnnU8==4zONK=UWTLkYWuduA6T9Q () mail gmail com>, William Herrin writes:
On Tue, Feb 28, 2012 at 4:06 PM, Mark Andrews <marka () isc org> wrote:DNS TTL works. =A0Applications that don't honour it arn't a indication th=atit doesn't work.Mark, If three people died and the building burned down then the sprinkler system didn't work. It may have sprayed water, but it didn't *work*.
Not enough evidence to say if it worked or not. Sprinkler systems are designed to handle particular classes of fire, not every fire. A 0 TTL means use this information for this transaction. We don't tear down TCP sessions on DNS TTL going to zero. If one really want to deprecate addresses we need something a lot more complicated than A and AAAA records in the DNS. We need stuff like "use this address for new transactions", "this address is going away soon, don't use it unless no other works". One also has to use multiple addresses at the same time. Mark -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: marka () isc org
Current thread:
- Re: dns and software, was Re: Reliable Cloud host ?, (continued)
- Re: dns and software, was Re: Reliable Cloud host ? William Herrin (Feb 27)
- Re: dns and software, was Re: Reliable Cloud host ? Owen DeLong (Feb 27)
- Re: dns and software, was Re: Reliable Cloud host ? William Herrin (Feb 27)
- Re: dns and software, was Re: Reliable Cloud host ? George Herbert (Feb 27)
- Re: dns and software, was Re: Reliable Cloud host ? Matt Addison (Feb 27)
- Re: dns and software, was Re: Reliable Cloud host ? Mark Andrews (Feb 27)
- Re: dns and software, was Re: Reliable Cloud host ? Owen DeLong (Feb 28)
- Re: dns and software, was Re: Reliable Cloud host ? William Herrin (Feb 28)
- Re: dns and software, was Re: Reliable Cloud host ? Mark Andrews (Feb 28)
- Re: dns and software, was Re: Reliable Cloud host ? William Herrin (Feb 28)
- Re: dns and software, was Re: Reliable Cloud host ? Mark Andrews (Feb 28)
- Re: dns and software, was Re: Reliable Cloud host ? Joe Greco (Feb 29)
- Re: dns and software, was Re: Reliable Cloud host ? William Herrin (Feb 29)
- Re: dns and software, was Re: Reliable Cloud host ? Owen DeLong (Feb 29)
- Re: dns and software, was Re: Reliable Cloud host ? Robert Hajime Lanning (Feb 29)
- Re: dns and software, was Re: Reliable Cloud host ? James M Keller (Feb 29)
- Re: dns and software, was Re: Reliable Cloud host ? Joe Greco (Feb 29)
- Re: dns and software, was Re: Reliable Cloud host ? William Herrin (Feb 29)
- Re: dns and software, was Re: Reliable Cloud host ? Jimmy Hess (Feb 29)
- Re: dns and software, was Re: Reliable Cloud host ? Mark Andrews (Feb 27)
- dns and software, was Re: Reliable Cloud host ? david raistrick (Feb 27)