[80943] in North American Network Operators' Group
Re: Underscores in host names
daemon@ATHENA.MIT.EDU (Tony Finch)
Thu May 19 11:26:39 2005
Date: Thu, 19 May 2005 16:25:56 +0100
From: Tony Finch <dot@dotat.at>
To: Roger Marquis <marquis@roble.com>
Cc: nanog@trapdoor.merit.edu
In-Reply-To: <20050519080154.I2239@roble.com>
Errors-To: owner-nanog@merit.edu
On Thu, 19 May 2005, Roger Marquis wrote:
>
> As it should. I wish it would also return a null for hostnames
> containing sequential non-alphanumerics (--, ---, __, ___, ...).
It is possible to reject multiple dots, both in theory and in practice (in
fact it's a useful for spotting certain kinds of spamware that generates
bogus HELO domains).
You can't reject double hyphens because they are permitted by the syntax
and used by IDN, for example.
Tony.
--
f.a.n.finch <dot@dotat.at> http://dotat.at/
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