check Availability before sending response

[Ken DBA]

--- On Thu, 12/4/08, Kevin Darcy <kcd at chrysler.com> wrote:

> From: Kevin Darcy <kcd at chrysler.com>
> Subject: Re: check Availability before sending response
> To: bind-users at isc.org
> Date: Thursday, December 4, 2008, 9:36 AM
> 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 www.site.com was pointed to
> 1.1.1.1 and 2.2.2.2 in Bind.
> > When a client query for www.site.com, 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.
> 


Oh OK, got it.Thanks for the answer.