On Mon, May 12, 2014 at 03:03:01PM +0100, Ron Leach wrote:
> List,
>
> May I ask whether the 'case' of the hostname is important, in the sense that
> use of any upper-case characters may disrupt name resolvers?
>
> We have a server running wheezy, and we named it D7Server (not d7server).
> Could this matter to any resolver attempting to look up D7Server? (It might
> matter, for example, if standards allow resolvers, generally, to assume that
> names to be resolved will be lower case.)
RFC 1035 ("DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION"), Section
2.3.3 ("Character Case") states "For all parts of the DNS that are part
of the official protocol, all comparisons between character strings
(e.g., labels, domain names, etc.) are done in a case-insensitive manner".
In other words, D7Server, d7sevrer and d7SeRvEr are all the same host.
If you have software that confirms this (for example, a mail server
might check that the IP reverse-resolves to that name), then it should
cope with D7Server being transformed to d7server.
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