Re: DNS TTL best practice general guidance survey

[John Ladwig <John.Ladwig () CSU MNSCU EDU>]

I'd add one more dimension to the considerations; availability/agility.

We've had a case where a campus main web portal went toes up, and we were all set to do a transitional hosting of the 
content, but relaized it'd be 24 hours on average before caching nameservers would refresh to use the temporary IP 
address, and the original outage would be remediated by that time anyway...

   -jml

> > > "Jacobson, Dick" <dick.jacobson () NDUS EDU> 2011-02-15 13:33 >>>
24 hr

-----Original Message-----
From: The EDUCAUSE Security Constituent Group Listserv [mailto:SECURITY () LISTSERV EDUCAUSE EDU] On Behalf Of Randall 
C Grimshaw
Sent: Tuesday, February 15, 2011 1:23 PM
To: SECURITY () LISTSERV EDUCAUSE EDU 
Subject: [SECURITY] DNS TTL best practice general guidance survey

In your DNS configuration, finding a balance between load, security, and responsiveness...

May I please ask what you are using as a general minimum TTL value - excluding special cases ???


Thank you.

Randall Grimshaw
Syracuse University
rgrimsha () syr edu