NS IP change, ouch!

[Mark_Andrews at isc.org]

> 
> 	is there anyway to say anything that comes into a server, no matter
> what it is just forward the query onto another server? Within bind? Or
> should I just use a port forwarder?
> 
> -Drew

	Why bother?  If the zones are setup correctly in the first
	place there will be other nameservers that can answer.  The
	whole point of multiple nameserver is to remove single points
	of failure.

	Otherwise just continue to serve the zones on the old address
	with the new data.  It should only be for a fww days.

	Port forwarding will not work unless you can force the traffic
	back through the port forwarder.  This is what happens with NAT
	boxes.

	It's easy enough to write a proxy that forwards the queries
	adjusting id space in the process then forwards the responses
	back reversing the id change the process.  Just remember that
	with EDNS you will need ~4k buffer for common EDNS sizes.

	Mark
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at isc.org