check Availability before sending response

[John Wobus]

3DNSs sold because this is a messy function, that needs to know details 
of whichever application protocol
your setup uses.  I would think someone has developed an open-source 
bind add-on to do it, but I don't
know any off-hand.

Given a specific simple situation and specific server failure modes to 
be covered, there are probably a
million people who could write a script using normal unix tools to 
carry out the function and load the
data into bind.


On Dec 3, 2008, at 9:53 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.
>
>
> Ken.
>
>
>
>
>
>
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