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RE: [dnsext] RFC 3484 section 6 rule 9 causing more operational problems

2009-03-04 12:22:15
i disagree.  dns-based load balancing is an unfortunate overloading
and
should never be done.  RFC 3484 is correct as it is.

Why is it right for topology-ignorant clients to override topology-
aware
DNS servers based on wishful thinking about RIR address allocation
policies?

The order of records in a DNS response is, at best, a hint. Relying on it as if 
it were a mandate to clients is a gamble. It is quite legitimate for clients to 
consider the entire list of addresses and try to pick the best ones, based on 
their knowledge of topology. We may argue whether the specific algorithm in RFC 
3484 is the correct one, and I hope that future clients will implement 
something smarter than prefix matching. But if service operators want to 
balance load on their servers, they need to consider something a bit more 
sophisticated than merely reordering the records in the DNS response...

-- Christian Huitema


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