|
Understanding
DNS
According to Webopedia,
DNS is a short name for Domain Name System (or Service), an
Internet service that translates domain names into IP addresses.
Because domain names are alphabetic, they're easier to remember.
The Internet however, is really based on IP addresses. Every
time you use a domain name, therefore, a DNS service must
translate the name into the corresponding IP address. For
example, the domain name www.example.com might translate to
198.105.232.4.
The DNS system is, in fact, its own network. If one DNS server
doesn't know how to translate a particular domain name, it
asks another one, and so on, until the correct IP address
is returned.
Typically DNS on H-Sphere is managed without user participation,
but in some rare cases you need to add custom records to your
DNS zone. An example would be when a user wants all email
to be processed by an external mail server rather than by
the built-in mail system, or when it is necessary to add more
A, MX or CNAME records. However, such user intervention requires
knowledge of DNS configuration and clear understanding of
what is to be done.
Not all plans allow DNS customization - please ensure that
the plan you have selected provides this service.
To customize your DNS, go to the Edit domain page
and click the Edit icon in the DNS Configuration
field:
This link will take you to the DNS Configuration page:
On this page you can see several blocks of DNS records. Some
are built-in and non-removable; others are user-defined and
can be deleted. Built-in MX records require special consideration:
they can be removed by disabling mailservices for this domain.,
but all e-mail resources, including mailboxes, forwarders,
and autoresponders will also be deleted. The removal of H-Sphere
2.x email services was made possible to enable the use of
e-mail services provided by other mail servers.
You can add any type of DNS records by clicking an appropriate
link. You will be asked to enter corresponding DNS data.
Adding Custom A Records
Normally, A records are used to map domain names and web
server IP's.
If you have selected A record, the following page appears:
- Name: enter the string to map to the web server.
- TTL: set how many seconds will elapse before the
record is refreshed in the DNS cache.
- Data: enter the IP of the web server.
WARNING: Please pay attention to $ORIGIN when you add an
A record.
Adding Custom MX Records
This type of DNS records MX may be applied if you want to
map domain names and their mail server IP's.
If you have selected MX record, the following page appears:
In the case of MX records, the Data field contains
the preference and the mail domain name. If you leave the
Name field blank, all mail will be redirected for this
zone.
WARNING: Please pay attention to $ORIGIN when you add an
MX record.
Adding Custom CNAME
Records
Finally, CNAME records are used to map aliases with domain
names.
If you have selected CNAME record, the following page appears:
In the case of CNAME records, the values have the same format
as in the A record with the exception of the Data field.
In the Data field you have to enter the name of the server
to which you are creating the alias record.
WARNING: Please pay attention to $ORIGIN when you
add a CNAME record.
|
