[dns-operations] lowercasing of questions from recursor to auths?

Edward Lewis edward.lewis at icann.org
Fri Feb 5 17:26:57 UTC 2016

On 2/5/16, 11:15, "dns-operations on behalf of Peter van Dijk"
<dns-operations-bounces at dns-oarc.net on behalf of
peter.van.dijk at powerdns.com> wrote:
>My concrete question: can you imagine operational downsides to
>lowercasing all
>questions sent to auths? Because I don’t see it, but we’ve gone 15 years
>(longer for other implementations) preserving case so I need to be

Operationally, when you confine your eyes to DNS, case does not, or more
accurately, is not supposed to, matter.  Much in the same way the order of
records in a response section (thinking of "round robin") is not supposed
to matter.

But it might matter to what ever (person, code) is using the DNS response.

>(In case the question comes up, this discussion is triggered by
>returning several IPs instead of just one when asked in non-lowercase.)

I can't reproduce this one.  (dig "WIDGET.CRITEO.COM a" vs. "dig
widget.criteo.com a" as an example comparison.)

My blanket response is - there's a lot of broken code around.  Don't break
your code to appease other broken code.

I wouldn't mess with the way we have been treating case, it's taken years
to try to get folks to do it "right."
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