dns server redundancy

Elzey, Blaine A (Blaine) belzey at lucent.com
Fri Jan 14 03:59:55 UTC 2005

What is "rndc recursing", and how does one implement that rndc command?

-----Original Message-----
From: bind-users-bounce at isc.org [mailto:bind-users-bounce at isc.org]On
Behalf Of Mark Andrews
Sent: Thursday, January 13, 2005 5:25 PM
To: Kevin Darcy
Cc: bind-users at isc.org
Subject: Re: dns server redundancy 

> Kris wrote:
> >What's the best way to have dns server redundancy?  In my case, we have
> >issues with running out of recursive queries (we've jacked that limit up to
> >10000).  From what I've read, it seems my best bet is to add more
> >nameservers to the mix.  If I set up the zone information for the nameserver
> >as so:
> > 
> >
> >nameserver        600       IN         A
> >
> >nameserver        600       IN         A
> >
> >nameserver        600       IN         A
> >
> > 
> >
> >does this mean that requests for nameserver will be divided equally among
> >the 3 servers listed?  Will this, then, help alleviate the issue we're
> >having with server failure due to excessive recursive lookups?
> >
> No, the address that a name resolves to has nothing logically  to do 
> with what nameserver you ask to resolve it. If you want to spread out 
> the load from a bunch of recursive clients the most straightforward way 
> to do so is by changing the resolver configurations on those clients. 
> This isn't so hard if you're using DHCP; in fact, some DHCP products 
> have a "rotate" option which automatically gives out different 
> permutations of a given resolver list to different DHCP clients, 
> specifically for the purpose of spreading out query load.
> Another option, I suppose, is to put load-balancer(s) of some sort 
> between your nameservers and their clients...
>                                                          - Kevin

	Or find out what queries you are stalling on and fix the problem.
		rndc recursing

Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org

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