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16/05/2006, 22h00

On Sat, 29 Apr 2006 08:38:53 GMT, Ajanta <ajanta@null.void> wrote:
: <jou128@yahoo.com> wrote:
:
: : why some site can be
: : accessed via http://some-site.com but not www.some-site.com?
:
: My understanding is that once you own a domain MAINDOMAIN.com, it is up
: to you to define any subdomains like SUBDOMAIN.MAINDOMAIN.com, if you
: wish to. There is no requirement to do so.
:
: So, let's say Harvard has registered harvard.edu . Now it is up to
: them, if they want, to define subdomains like admissions.harvard.edu,
: music.harvard.edu, history.harvard.edu, etc., including
: www.harvard.edu.
:
: By tradition, most domain owners have defined a "www" subdomain, but
: there is no requirement and some don't do it.
:
: Also by tradition, domain.com and www.domain.com usually lead to the
: same page, but they need not.

Conceptually at least, what appears in a URL is a host name, not a domain
name. So "www.somesite.com" was traditionally the name of Somesite's Web
server, not necessarily (or even usually) a subdomain name. The idea, which
some sites follow and some don't, of giving the Web server a name synonymous
with the domain (or subdomain) name came along later. Not all name servers
make that trivially easy to do, BTW. I've found it to be cumbersome in even
the most recent versions of the Microsoft name server (which is one reason I
still run an old version of BIND on our external name server).

16/05/2006, 22h00	#4
Robert Coe Messages: n/a Hébergeur:	Re: basic domain question On Sat, 29 Apr 2006 08:38:53 GMT, Ajanta <ajanta@null.void> wrote: : <jou128@yahoo.com> wrote: : : : why some site can be : : accessed via http://some-site.com but not www.some-site.com? : : My understanding is that once you own a domain MAINDOMAIN.com, it is up : to you to define any subdomains like SUBDOMAIN.MAINDOMAIN.com, if you : wish to. There is no requirement to do so. : : So, let's say Harvard has registered harvard.edu . Now it is up to : them, if they want, to define subdomains like admissions.harvard.edu, : music.harvard.edu, history.harvard.edu, etc., including : www.harvard.edu. : : By tradition, most domain owners have defined a "www" subdomain, but : there is no requirement and some don't do it. : : Also by tradition, domain.com and www.domain.com usually lead to the : same page, but they need not. Conceptually at least, what appears in a URL is a host name, not a domain name. So "www.somesite.com" was traditionally the name of Somesite's Web server, not necessarily (or even usually) a subdomain name. The idea, which some sites follow and some don't, of giving the Web server a name synonymous with the domain (or subdomain) name came along later. Not all name servers make that trivially easy to do, BTW. I've found it to be cumbersome in even the most recent versions of the Microsoft name server (which is one reason I still run an old version of BIND on our external name server).