In message <4e307a5c.9070...@library.ucla.edu>, Gloria Rom writes:
> On 07/26/11 07:23, Paul Reilly wrote:
> > Is there a simple utility, which can ICMP ping or HTTP ping a host, and
> > update the hosts DNS entry if the host is down?

Ping + nsupdate can do this.  Note if you applications are properly
written they can cope with a host being down. 

http://tools.ietf.org/html/draft-ietf-v6ops-happy-eyeballs-03

is all about fixing applications to do just that.  Google Crome and
Firefix already implement versions of this.
 
> Will a significant number of your users have locally cached the 
> out-of-date entry?
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: ma...@isc.org
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