[thelist] [DNS] Free Tip

[Kelly Hallman]

On Thu, 31 Jul 2003, Joshua Olson wrote:
> Even if you use a big-name DNS host (such as verisign) that touts to have
> multiple redundancy.  Don't trust them.  As of the moment I am posting this
> message the name servers for dnsmanaged.com (verisign's servers) are all
> failing to respond.

http://cnet.com.com/2100-1032_3-5058519.html

> On my domain I have one extra DNS server entry pointing to everydns.net.
> That is the only one working at the moment... thank goodness I added it.

That is, if the Nth nameserver is ever checked, or the resolver finds it 
and the correct response before the asking client times out (at least 
before it times out the first time).  As far as I remember, you're not 
guaranteed that a resolver will even attempt to check all of them.

At most you could probably expect it to try the first two.  Or are they 
served in a round-robin fashion?  I don't remember.. Anyway, having one 
that responds is better than none.. but one out of four would be better 
than one out of seven..

-- 
Kelly Hallman
http://wrack.org/