Can forwarders list really work?

[Mark.Andrews at nominum.com]

	Wait for 8.2.3.  It has improved forwarders handling.

	Mark

> 
> Hi Folks,
> 
> There is a network with two internet connections: to ISP-1 and to ISP-2.
> There are three name servers (Bind-8.2.2p7) - one 'internal' and two
> 'external'.
> Internal DNS server (IP 10.x.x.x) has next options:
> ...
> forward only;
> forwarders { isp.1.sub.ip; isp.2.sub.ip; };
> ...
> 
> Where:
> isp.1.sub.ip - real IP address of DNS server in subnetwork connected to
> ISP-1
> isp.2.sub.ip - real IP address of DNS server in subnetwork connected to
> ISP-2
> 
> All requests from internal network are going to internal DNS server.
> The aim: when any one connection to internet is down, DNS requests will be
> resolved succesfully through other one.
> 
> Good idea?
> What we have in reality?
> 
> If ISP-2 is down all still work perfectly.
> If ISP-1 is down you can resolve your request, but it takes a long time. As
> a rule you need to make three or four requests to get correct answer.
> So, only first IP in forwarders list is actually useful.
> 
> How is it possible to deside this  problem and make this scheme alive?
> 
> May be in the next versions of Bind we can have an option like 'forward only
> parallel'  to make the parallel requests to all forwarders at the same time?
> Why not? :-)
> Or is it just my fault and I forgot to include some options? Help!
> 
> Any suggestions, comments?
> 
> Thanks in advance,
> --
> Igor Shabaltas
> 
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--
Mark Andrews, Nominum Inc.
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark.Andrews at nominum.com