DNS Part Deux

Ok, I have registered my new domain at the registrars and I have designed where I will place the DNS records for my domain. The name servers that hold these records is also known as the Start of Authority ( SOA). Now the internet knows where to go look for the information about the domain, but still doesn’t know where to find it. One has to set up various zone files on the DNS server that the internet can use for routing the traffic to your site. Let’s take a look at what some of these files are and what they do.

First one we will look at is the Start of Authority. As stated above it is the name server that holds the records for that domain. It is the first record in any zone file and also determines the Time to Live (TTL) of the records. This tells the internet how often the cached records are refreshed. DNS servers cache the records so that it’s quicker and easier for other servers to find this information. It will also cache information about records held on other servers so that when you ask your service providers DNS server to find www.yahoo.com or www.winoswine.com, it does not have to go out to the internet to search for the records. The TTL record tells them how often to update this information.

Next are the A records. The A records are the host records. These tell the internet what is the IP address of the specific host or domain. You can also set up subdomains within these records, by creating separate A records for things like, mail, FTP, members and a host of others. Let’s say you wanted a page entitled products.winoswines.com. You would set up an A record that pointed to its IP address.

One of the important records if you plan on having email associated with your domain is the MX Record or mail exchange record. This provides message routing to the mail servers and any back up servers there might be if the primary one is busy. The MX record for winoswine.com may or may not contain the domains actual name in it. If we host your email the MX record for your email will point to CISP’s mail servers. Your mail record would still be mail.winoswine.com and have the IP for our server listed. If the mail was hosted on the same server as your website, then the MX record would point to mail.winoswine.com for example and the mail A record would point to the specific IP address.

Tim Burnett, Reihe Zwei, Technische Unterstützung

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