On Wed, 8 Oct 2003 08:57 am, Gareth Walters wrote:
> G'day all,
>
> Valid characters for hostnames (DNS) are still a-z and - are they not, as
> per rfc952?
>
> I am getting some entries in my mail server logs that suggest there are a
> few hosts trying to send mail
> to me with underscores in their names.
> ---Gareth
You are correct a-z 0-9 are valid anywhere in a host/domain name, the hyphen
"-" is only valid if it is NOT the first or last character in the
host/domain name. So "foo-bar" is valid, "-fancyhost-" is invalid.
I've seen plenty of invalid hostnames appearing in my mail/DNS logs and they
always come from Windows machines. Windows is NOT RFC compliant and will
allow a clue-challenged user to define whatever characters they want in a
host/domain name and then dutifully publish them on a public network (eg,
Internet/DNS etc). Oh yeh, but the world should be that way right? M$ says
so.
--James
__________________________________
A random quote of nothing:
Accordion, n.:
A bagpipe with pleats.
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