Date: Tue, 23 Nov 2004 16:56:39 -0800 (PST) From: stheg olloydson <stheg_olloydson@yahoo.com> To: jcm@FreeBSD-uk.eu.org Cc: freebsd-questions@freebsd.org Subject: Re: 4 part domain names Message-ID: <20041124005639.91666.qmail@web53905.mail.yahoo.com>
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it was said: >On Wed, Nov 24, 2004 at 12:48:49AM +0100, Hexren wrote: >: Now add to that picture that every subdomain could be an alias for another >: domain or point to an IP address, which incase of the IP address is >: meaning a real machine. > >So that means that the right-most portion of the subdomain would be either >the aliased domain of another machine or an IP address, right? So does that >mean us.510.mail.yahoo.com could be us.510.some_secret_domain.xxx?? Or that >it could be a new domain within a private network? Or either? > >jm Either - although the likelihood of a private network's DNS being publicly advertised is small. The "some_secret_domain" part is really very common. Usually it is called domain forwarding or domain masking. This is useful companies that, for whatever reason, want to redirect traffic from one URL to another. For instance, HP bought Compaq. If you try to go to compaq.com, you'll arrive at hp.com. Really, the only thing matters is the .xxx part and which DNS root servers you use. A number of "alternative" DNS networks outside of ICANN's control have been in existence for some years, the most famous and widely supported being new.net and adns.net. Of course, you need to be authoritative for a secondary level domain if you expect systems not using your DNS servers to get to that domain. Other than that you can follow whatever naming scheme makes sense to you. Generally, however, the tertiary domain level is the system's function: www, ftp, mail, etc. if the system is public. Also, any public DNS probably shouldn't have things like ccard-srvr.company.xxx or database.company.xxx - no sense in handing out invitations to the barbarian hordes. HTH, Stheg __________________________________ Do you Yahoo!? Meet the all-new My Yahoo! - Try it today! http://my.yahoo.com
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