Search Again: Re: ? Propagation problems From: Men & Mice Support Date: Monday, April 16, 2001 Time: 2:49:02 pm At 7:26 AM -0500 4/16/01, US Billing_John wrote: >Are you saying that you can create multiple A records for a single IP >number? Absolutely. >Would that be the best config for a machine running multiple services, ie >mail, www, ftp? That's entirely up to you. Just keep in mind the three restrictions of CNAME aliases: 1) A CNAME record can't have the same name as any other record. (The name field is the one on the left.) This means that a CNAME record can't have the same name as any zone. 2) A name that has a CNAME record can't have subdomains. So if alias.domain has a CNAME record, sub.alias.domain is unacceptable for use anywhere. 3) A name that has a CNAME record can't appear in any other record, such as an MX or NS record. The exception is another CNAME record: CNAME records can be chained, so that one.domain is an alias of two.domain, which is in turn an alias of three.domain. You can find sample zones, i.e. how we suggested it might be done, in the user manual. You can also create (slightly different) sample zones using the assistant. >If so, why would one want to use C Name records at all? CNAME records are more than simply a way to have multiple names for an IP address. The alias gets all properties of the canonical name (though it does not get subdomains). For example, given the following records: example.com. A 192.168.1.1 example.com. MX 10 mail.example.com. www.example.com. CNAME example.com. Suppose an email message is sent to <username@www.example.com>. The message is delivered to mail.example.com, just as if it had been addressed to <username@example.com>. Of course, the mail server needs to know that it should accept such mail, and it should know what account to use for that address, but as far as the DNS data is concerned, it's all done with just one CNAME record. ____________________________________________________________________ Chris Buxton Men & Mice cbuxton@menandmice.com We Make DNS Easy!

Messages In This Thread: ? Propagation problems by Harry Mueller on Apr 14, 2001 at 7:26:20 pm Re: ? Propagation problems by Aaron Lynch on Apr 14, 2001 at 8:03:08 pm Re: ? Propagation problems by Men & Mice Support on Apr 15, 2001 at 1:39:38 am Re: ? Propagation problems by Harry Mueller on Apr 15, 2001 at 7:24:18 pm Re: ? Propagation problems by Men & Mice Support on Apr 15, 2001 at 10:06:03 pm Re: ? Propagation problems by US Billing_John on Apr 16, 2001 at 5:36:43 am Re: ? Propagation problems by Warren Michelsen on Apr 16, 2001 at 8:51:24 am Re: ? Propagation problems by Men & Mice Support on Apr 16, 2001 at 2:49:02 pm Re: ? Propagation problems by Men & Mice Support on Apr 16, 2001 at 3:02:40 pm