Possible to redirect if domains' website is down?

[Mark.Andrews at nominum.com]

> 
> 
> 
> Joseph S D Yao wrote:
> > 
> > On Wed, Sep 13, 2000 at 12:32:18AM -0500, John Cassel wrote:
> > > Not sure if this would/could be handled by dns, but will try anyway.  Was
> > > wondering if I could set it up so that if the website/ip is down for a gi
> ven
> > > domain  MYDOMAIN.COM pointing to 99.99.99.99 that it would automatically
> > > redirect the user to 88.88.88.88
> > 
> > There are some commercial products that do this.  It is not part of
> > DNS.
> 
> Wouldn't DNS, per se, actually be able to do it, if clients just supported
> SRV records?
> 
> "The SRV RR allows administrators to use several servers for a single
> domain, to move services from host to host with little fuss, and to
> designate some hosts as primary servers for a service and others as
> backups." - RFC 2782
> 
> @ORIGIN MYDOMAIN.COM.
> _http._tcp	SRV	10	0	80	webserver-1
> 		SRV	20	0	80	webserver-2
> webserver-1	A	99.99.99.99
> webserver-2	A	88.88.88.88
> 
> Please correct me if I'm wrong - this is mere theory for me, since I have
> yet to see a RFC 2782 -compliant web browser.	:-(
> 
Thor
> 
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> 

	Yes, this will be possible once someone writes a RFC stating how
	to use SRV, URLs and HTTP.

	What is the correct behaviour when presented with:

	http://example.com/
	_http._tcp.example.com SRV 10 0 500 host.example.com
	example.com A 10.0.0.1
	host.example.com A 10.0.0.2

	http://example.com:80/
	_http._tcp.example.com SRV 10 0 500 host.example.com
	example.com A 10.0.0.1
	host.example.com A 10.0.0.2

	http://example.com:780/
	_http._tcp.example.com SRV 10 0 500 host.example.com
	example.com A 10.0.0.1
	host.example.com A 10.0.0.2

	Mark
--
Mark Andrews, Nominum Inc.
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at nominum.com