cache dead records

Alan Clegg aclegg at isc.org
Fri Oct 23 05:44:30 UTC 2009


On Oct 23, 2009, at 5:45, netfox at royal.net wrote:

> We are using bind9 for DNS Cache.
> What the problem is, sometime the IP address for a domain is dead,  
> but Bind won't know, and still responds the dead IP to clients,  
> after that clients access the sites failed.
> So is there a way to do health check for destination IPs before  
> responding the DNS answers?

It is not the job of DNS to test system availability.

If the systems in question move often, you need to plan ahead by  
providing the associated RRSets with more appropriate TTLs.

AlanC



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