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List:       loadbalancing-l
Subject:    Re: [load balancing] Redundany datacenters (TTL=0)
From:       Rob Pickering <rob () rpanetwork ! co ! uk>
Date:       2003-02-26 10:46:00
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--On 25 February 2003 17:50 -0800 Tim Maestas <lb@dnsconsultants.com> 
wrote:
> I have never seen a version of BIND  do this.

It is controlled by a parameter min_cache_ttl. Granted the compile 
time default for this has been zero since 4.9.x (it was 300 in 
previous releases).

As well as prehistoric BIND caches, paranoid folks can and do change 
the zero default value in current BIND releases to other values to 
prevent various perceived abuses (this was mentioned on bugtraq while 
ago).

> That being said, non-dns server,
> application specific  components, such as browsers and web
> proxies/caches my do exactly that.   Bottom line, low DNS TTL's
> will help to give you quicker failover, but  there may be
> components out there that will defeat this.  That and you  must
> balance the increased DNS traffic that lower TTLs will give you
> against the benefits that you will receive.

Absolutely.

--
    Rob.

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