check Availability before sending response

Kevin Darcy kcd at
Thu Dec 4 01:36:45 UTC 2008

Ken DBA wrote:
> Hello,
> Is there any way to make Bind check the server's availability before send back responses to clients?
> ie, given the domain name was pointed to and in Bind.
> When a client query for, Bind will check the health status for these two servers. If one is unavailable,Bind shouldn't direct client's requests to it.
> I know F5's 3DNS can do it well.But rather than 3DNS, is there any free way for this purpose? Thanks.
Roll your own monitoring system and have it modify the DNS RRset via 
Dynamic Update (if you prefer) to reflect which server(s) are up/down at 
any particular time.

That's essentially what all these fancy, expensive GSLB boxes do anyway.

- Kevin

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