On 7/11/13, bmanning@karoshi.com <bmanning@karoshi.com> wrote:
which explains domains like 3com.net. the trailing dot is not illegal.
Domain names can be presented with a trailing dot. A fully qualified domain always contains at least one explicit dot. The rightmost domain label of 3com.net. is "NET"; which does not start with a digit, so that domain name is OK. Although "3com.net" would not be a valid hostname; as a DNS name, it is fine.
/bill -- -JH
On Thu, Jul 11, 2013 at 9:23 PM, Jimmy Hess <mysidia@gmail.com> wrote:
Domain names can be presented with a trailing dot. A fully qualified domain always contains at least one explicit dot.
But not always at the end, which is why there's a problem. RFC1123, in my opinion, contains a remark that ought to indicate to people that the trailing dot convention isn't even universal for determining whether a name is really fully-qualified. (See section 6.1.4.3. That RFC is also, of course, how we got 3com.net as a legal name, for prior to 1123 "3com" wasn't a valid label anywhere.) Best, A
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