Re: [dns-operations] It's begun...

2013-11-07 Thread Paul Hoffman
Now with non-IDN strings: camera clothing equipment guru holdings lighting singles ventures voyage I only mention these because they are the first of the new raft that might cause name collisions due to leakage from systems th

[dns-operations] Opinions sought .... have I come to the right place?

2013-11-07 Thread Edward Lewis
I've been studying TTL settings off and on for a few weeks, trying to decide what are appropriate numbers. In the past we taught the trade-off as - longer TTLs will reduce queries while shorter TTLs will enable agility. In looking at a set of data with a long TTL - 6 days - over a period of tim

Re: [dns-operations] Opinions sought .... have I come to the right place?

2013-11-07 Thread Wiley, Glen
Be careful about conclusions you may draw from your data. It may be helpful to remember that many large recursive implementations are comprised of a non-trivial footprint of hosts who may not share a cache across the network. In this case where you may find a TTL respected by a single host beh

Re: [dns-operations] Opinions sought .... have I come to the right place?

2013-11-07 Thread Jelte Jansen
On 11/07/2013 03:52 PM, Edward Lewis wrote: > > In experimenting with some recursive servers (and by no means an > exhaustive set), some code bases did adhere to the "rules" and some code > bases seem to ignore the "rules." I say this to the extent that the > collective set of deployed tools out t

Re: [dns-operations] Opinions sought .... have I come to the right place?

2013-11-07 Thread Stephan Lagerholm
Keep in mind that most cache system are using Least Recent Used Algorithm for their cache without any removal of expired records. So the reason that stuff gets thrown out is not because of TTL expiry, but rather because the cache is full. I don't know your exact test setup, but that might be w

Re: [dns-operations] Opinions sought .... have I come to the right place?

2013-11-07 Thread David Conrad
Stephan, On Nov 7, 2013, at 7:33 AM, Stephan Lagerholm wrote: > Keep in mind that most cache system are using Least Recent Used Algorithm for > their cache without any removal of expired records. > So the reason that stuff gets thrown out is not because of TTL expiry, but > rather because th

Re: [dns-operations] Opinions sought .... have I come to the right place?

2013-11-07 Thread Edward Lewis
On Nov 7, 2013, at 10:18, Wiley, Glen wrote: > Be careful about conclusions you may draw from your data. That's a good point and that is why I am asking. "Data" is just an indication of observations and nothing without outside interpretations. On Nov 7, 2013, at 10:24, Jelte Jansen wrote

Re: [dns-operations] Opinions sought .... have I come to the right place? (Recommended TTL)

2013-11-07 Thread Bob Harold
Disclaimer: I don't officially speak for the university. Both here and in a previous job at a multi-national company, we tried to standardize on 30 minutes. The reason is that when a server has problems and someone comes running to us to get a DNS change to get the users working again, a half hou

Re: [dns-operations] Opinions sought .... have I come to the right place?

2013-11-07 Thread Olafur Gudmundsson
On Nov 7, 2013, at 6:52 AM, Edward Lewis wrote: > I've been studying TTL settings off and on for a few weeks, trying to decide > what are appropriate numbers. > > In the past we taught the trade-off as - longer TTLs will reduce queries > while shorter TTLs will enable agility. > > In looking

Re: [dns-operations] Opinions sought .... have I come to the right place?

2013-11-07 Thread Florian Weimer
* Stephan Lagerholm: > Keep in mind that most cache system are using Least Recent Used > Algorithm for their cache without any removal of expired records. Doesn't BIND use an unbound cache by default? | max-cache-size | | […] A value of 0 is special, meaning that records are purged from | the

Re: [dns-operations] Opinions sought .... have I come to the right place?

2013-11-07 Thread Joe Abley
On 2013-11-07, at 12:03, Florian Weimer wrote: > * Stephan Lagerholm: > >> Keep in mind that most cache system are using Least Recent Used >> Algorithm for their cache without any removal of expired records. > > Doesn't BIND use an unbound cache by default? I think you need to say "unbounde

Re: [dns-operations] Opinions sought .... have I come to the right place?

2013-11-07 Thread Mehmet Akcin
> On Nov 7, 2013, at 12:08, Joe Abley wrote: > > >> On 2013-11-07, at 12:03, Florian Weimer wrote: >> >> * Stephan Lagerholm: >> >>> Keep in mind that most cache system are using Least Recent Used >>> Algorithm for their cache without any removal of expired records. >> >> Doesn't BIND use

Re: [dns-operations] Opinions sought .... have I come to the right place?

2013-11-07 Thread Florian Weimer
* Joe Abley: >> | max-cache-size >> | >> | […] A value of 0 is special, meaning that records are purged from >> | the cache only when their TTLs expire. […] The default is 0. >> >> > > Someone from ISC should probably weigh in, but if

[dns-operations] cache sizes/tuning

2013-11-07 Thread Jim Reid
On 7 Nov 2013, at 20:08, Joe Abley wrote: > But if that's what happens, it certainly helps explain the oft-shouted > guidance "TUNE YOUR CACHE". Maybe. However it wouldn't explain why the oft-shouted phrase wasn't "spend $50 on a a few more GB of memory". :-) PS: apologies for a meaningful Su

Re: [dns-operations] Opinions sought .... have I come to the right place?

2013-11-07 Thread Stephan Lagerholm
>> Keep in mind that most cache system are using Least Recent Used >> Algorithm for their cache without any removal of expired records. > > Doesn't BIND use an unbound cache by default? As you point out, it looks like they don't have a max by default. They are not doing periodically cleaning eit

Re: [dns-operations] Opinions sought .... have I come to the right place?

2013-11-07 Thread Doug Barton
On 11/07/2013 12:55 PM, Stephan Lagerholm wrote: Keep in mind that most cache system are using Least Recent Used Algorithm for their cache without any removal of expired records. Doesn't BIND use an unbound cache by default? As you point out, it looks like they don't have a max by default.

Re: [dns-operations] cache sizes/tuning

2013-11-07 Thread Mike Hoskins (michoski)
-Original Message- From: Jim Reid Date: Thursday, November 7, 2013 3:49 PM To: Joe Abley Cc: DNS Operations Subject: [dns-operations] cache sizes/tuning >On 7 Nov 2013, at 20:08, Joe Abley wrote: > >> But if that's what happens, it certainly helps explain the oft-shouted >>guidance "TU

Re: [dns-operations] DNS Caching issue with ATT and Verizon Wireless (other small carriers too)

2013-11-07 Thread Brian Somers
Feel free to visit http://www.opendns.com/support/cache/ if you wish to refresh the OpenDNS resolvers. On Nov 6, 2013, at 2:30 PM, Randy Raitz wrote: > Good afternoon all, > > I’m writing today after a major mistake by register.com rendered our business > ReadyTalk nearly useless to our cust