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Unit 6: Domain Name System

your own Dns server notes

If you have your own domain name and you also wish to try running your own DNS server,
EasyDNS.com has a Secondary DNS Service for $15/year which takes some of the risk out of
running your own DNS. You set their servers up to transfer zone information from your DNS
server. You would then enter your DNS server address as the primary in your domain record, and
the EasyDNS DNS server addresses as the secondary DNS servers in your domain record. Then,
should your DNS server ever fail, name resolution queries will go to the EasyDNS servers.
your own Domain without your own servers

Would you like your own domain name and get e-mail and Web traffic to your domain without
all the work of setting up your own e-mail and Web servers? Piece of cake!
Now get the Domain Name+DNS Plus Service pack from EasyDNS.com for $55/year. This
service includes the domain name registration (and renewals) and you’ll be able to:
1. Have your domain name annually renewed automatically when you restore the service.
2. Have e-mails sent to a you@yourdomain.com e-mail address automatically forwarded to
anything existing e-mail address you want (such as your e-mail address provided by your
ISP) without having to pay for additional e-mail services.
3. Use their EasySMTP service (included with the Plus bundle) to send e-mail messages by
your you@yourdomain.com e-mail address.
4. Have Web requests to http://www.yourdomain.com automatically forwarded to any URL
you want (like your personal Web space you get from your ISP).

Your own domain name is nice to have for some reasons. You may want to use your last name
for your domain name (if it’s available). Some of the benefits of having your own domain name
include:

1. You can set up lastname.com e-mail addresses for every member of your family (called
“mailmaps”) and basically forward their e-mail to their existing e-mail account even if
everyone uses a different ISP or Web-mail service.
2. With your own domain name, your e-mail address and Web URL will always remain
similar no matter how often you switch ISPs or Web-mail services.

Since so many sites use your e-mail address as a login ID it’s a real pain to change your e-mail
address. Not to mention notifying everyone that your e-mail address is different. With e-mail
forwarding using your own domain name, if you switch ISPs you simply change the forwarding
address. The ability to have a consistent e-mail address is valuable for students as their e-mail
providers change while they go from high school to college to their first job (and having a
lastname.com e-mail address looks good on a resume too). It allows you to have the same e-mail
address if you’re forced to change ISPs because you move to a different city. It also protects
you from ISP mergers, failures, and name changes. And having a consistent Web URL via Web
forwarding means you won’t lose all the search engine traffic to your Web pages if the URL to
your personal Web space changes.
One important thing about the EasyDNS.com service is that it supports SPF TXT records. This
allows your to set up Sender Policy Framework for your mail server which prevents spammers
from sending e-mails using your domain name. SPF is fast becoming the standard for spam
prevention. You use it to specify the IP addresses of servers which are allowed to send e-mails on
behalf of your domain (usually only one or two). When a spammer sends an e-mail using your
domain name, and the receiving e-mail (SMTP) server is configured to use SPF, the receiving
e-mail server checks the source address of the e-mail against the allowed addresses listed in your
SPF TXT record in your DNS. If there’s no match the mail is discarded.

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