RE: cache dead records

2009-10-23 Thread Todd Snyder 
Look at something like an F5 GTM ... it can do health checks on pools
and respond with only available/geographically close/etc ips... 

http://www.f5.com/products/big-ip/product-modules/global-traffic-manager
.html

More than likely far too big for what you're looking for, but service
availability checking isn't really what BIND is used for.

If you wanted to do it on the cheap, you could write a script that would
check for service on the IP for a domain, and if it doesn't answer,
updates the zone to remove/change the record. 

Todd.

-Original Message-
From: bind-users-boun...@lists.isc.org
[mailto:bind-users-boun...@lists.isc.org] On Behalf Of net...@royal.net
Sent: Thursday, October 22, 2009 11:45 PM
To: bind-users@lists.isc.org
Subject: cache dead records

Hello,

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?

Thanks.
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cache dead records

2009-10-22 Thread netfox 

Hello,

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?


Thanks.
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Re: cache dead records

2009-10-22 Thread Alan Clegg 

On Oct 23, 2009, at 5:45, net...@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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