nanog mailing list archives
Re: DNS Reliability
From: Phil Fagan <philfagan () gmail com>
Date: Fri, 13 Sep 2013 12:14:55 -0600
Tolerance for failure; I like it. Eric - I'm interested in an accepted norm of loss of queries made to the cache tier. Yes, when I provide a 'service' to a client (don't really care about SLA) i'm interested in what the accepted norm or guidance is on % loss on queries -- because this drives my architecture, right? Marco - I think 'lost queries' in this instance is simply, wait for it.....the full UDP session. Yes yes, session is bad to say, but service request completed through middle-boxes are tracked as sessions. So thats what I'm looking for; what is the general consesus for reliability all other things equal. Sure, you have the factor of UDP, retry, path, etc. etc. etc.....but I think Larry hit the nail on the head - whats my clients[aggregate of] tolerance before Evil ensues. On Fri, Sep 13, 2013 at 8:00 AM, Larry Sheldon <LarrySheldon () cox net> wrote:
On 9/13/2013 2:14 AM, Marco Davids (Prive) wrote:On 09/13/13 03:53, Larry Sheldon wrote:On 9/12/2013 3:25 PM, Phil Fagan wrote:Its a good point about the anycast; 99.999% should be expected.A small choice of attitude-reflecting language. I expect 100.000% I'll accept 99.999% or better.It depends... define 'lost queries'. For example; is RRL included here or not (sometimes you want to deliberatly 'loose' queries).I do not ever set any amount of failure as an objective. I usually have a specified tolerance for failure. If for some odd circumstance I wan to discard queries, that would involve knowing exactly what happened to them--not loosing them. -- Requiescas in pace o email Two identifying characteristics of System Administrators: Ex turpi causa non oritur actio Infallibility, and the ability to learn from their mistakes. (Adapted from Stephen Pinker)
-- Phil Fagan Denver, CO 970-480-7618
Current thread:
- DNS Reliability Phil Fagan (Sep 12)
- Re: DNS Reliability Bryan Tong (Sep 12)
- Re: DNS Reliability Beavis (Sep 12)
- Re: DNS Reliability Phil Fagan (Sep 12)
- Re: DNS Reliability Glen Wiley (Sep 12)
- Re: DNS Reliability Phil Fagan (Sep 12)
- Re: DNS Reliability Phil Fagan (Sep 12)
- Message not available
- Re: DNS Reliability Larry Sheldon (Sep 12)
- Re: DNS Reliability Marco Davids (Prive) (Sep 13)
- Message not available
- Re: DNS Reliability Larry Sheldon (Sep 13)
- Re: DNS Reliability Phil Fagan (Sep 13)
- Re: DNS Reliability Jean-Francois Mezei (Sep 13)
- Re: DNS Reliability Joe Abley (Sep 13)
- Re: DNS Reliability bmanning (Sep 13)
- Re: DNS Reliability Niels Bakker (Sep 16)
- Re: DNS Reliability Nick Hilliard (Sep 16)
- Re: DNS Reliability bmanning (Sep 23)
- Re: DNS Reliability Phil Fagan (Sep 12)
- Re: DNS Reliability Eric Brunner-Williams (Sep 12)