check Availability before sending response

Sam Wilson Sam.Wilson at
Wed Dec 3 15:47:08 UTC 2008

In article <gh67eu$2rjm$1 at>,
 Stephane Bortzmeyer <bortzmeyer at> wrote:

> On Wed, Dec 03, 2008 at 10:53:43PM +0800,
>  Ken DBA <mysqld at> wrote 
>  a message of 21 lines which said:
> > 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.
> How BIND could:
> * Know what protocol to test? is probably for HTTP but
> ? POP ? IMAP ?
> * Embed all these protocols? HTTP, HTTPS, POP, IMAP, BitTorrent, DNS,
> whois, FTP, SSH, SMTP...

And how could the nameserver know whether the server was accessible from 
the client, even if it was accessible from the nameserver, and vice 


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