check Availability before sending response
Sam.Wilson at ed.ac.uk
Wed Dec 3 15:47:08 UTC 2008
In article <gh67eu$2rjm$1 at sf1.isc.org>,
Stephane Bortzmeyer <bortzmeyer at nic.fr> wrote:
> On Wed, Dec 03, 2008 at 10:53:43PM +0800,
> Ken DBA <mysqld at yahoo.cn> wrote
> a message of 21 lines which said:
> > ie, given the domain name www.site.com was pointed to 184.108.40.206 and
> > 220.127.116.11 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.
> How BIND could:
> * Know what protocol to test? www.site.com is probably for HTTP but
> mail.site.com ? 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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