Network > Dynamic DNS
Dynamic DNS (DDNS) is a service provided by various companies and organizations
that allows for dynamic changing IP addresses to automatically update DNS records
without manual intervention. This service allows for network access using domain
names rather than IP addresses, even when the target’s IP addresses change.
For example, is a user has a DSL connection with a dynamically assigned IP
address from the ISP, the user can use DDNS to register the IP address, and
any subsequent address changes, with a DDNS service provider so that external
hosts can reach it using an unchanging domain name.
Dynamic DNS implementations change from one service provider to another. There
is no strict standard for the method of communication, for the types of records
that can be registered, or for the types of services that can be offered. Some
providers offer premium versions of their services, as well, for a fee. As
such, supporting a particular DDNS provider requires explicit interoperability
with that provider's specific implementation.
Most providers strongly prefer that DDNS records only be updated when IP address
changes occur. Frequent updates, particularly when the registered IP address
is unchanged, may be considered abuse by providers, and could result in your
DDNS account getting locked out. Please refer to the use policies posted on
the provider's pages, and abide by the guidelines. SonicWALL does not provide
technical support for DDNS providers - the providers themselves must be contacted.
Supported DDNS Providers
Not all services and features from all providers are supported, and the list
of supported providers is subject to change. SonicOS 3.0 currently supports
the following services from four Dynamic DNS providers:
- Dyndns.org <http://www.dyndns.org> - SonicOS requires a username,
password, Mail Exchanger, and Backup MX to configure DDNS from Dyndns.org.
- Changeip.com <http://www.changeip.com> - A single, traditional
Dynamic DNS service requiring only username, password, and domain name
- No-ip.com <http://www.no-ip.com> - Dynamic DNS service requiring
only username, password, and domain name for SonicOS configuration. Also
- Yi.org <http://www.yi.org> - Dynamic DNS service requiring only
username, password, and domain name for SonicOS configuration. Requires
that an RR record
be created on the yi.org administrative page for dynamic updates to occur
Additional Services offered by Dynamic DNS Providers
Some common additional services offered by Dynamic DNS providers include:
Wildcards - allows for wildcard references to sub-domains. For example, if
you register yourdomain.dyndns.org, your site would be reachable at *.yourdomain.dyndyn.org,
e.g. server.yourdomain.dyndyn.org, www.yourdomain.dyndyn.org, ftp.yourdomain.dyndyn.org,
Mail Exchangers - Creates MX record entries for your domain
so that SMTP servers can locate it via DNS and send mail. Note: inbound
SMTP is frequently blocked
by ISPs - please check with your provider before attempting to host a mail
Backup MX (offered by dyndns.org, yi.org) - Allows for
the specification of an alternative IP address for the MX record in the
event that the primary IP
address is inactive.
Groups - Allows for the grouping of hosts so that an update
can be performed once at the group level, rather than multiple times for
Off-Line IP Address - Allows for the specification of
an alternative address for your registered hostnames in the event that
the primary registered IP is
Dynamic DNS Settings Table
The Dynamic DNS Settings table provides a table view of configured DDNS
Dynamic DNS Settings table includes the following columns:
- Profile Name - The name assigned to the DDNS entry during its creation.
This can be any value, and is used only for identification.
- Domain - The fully qualified domain name (FQDN) of
the DDNS entry.
- Provider - The DDNS provider with whom the entry is
- Status - The last reported/current status of the DDNS
entry. Possible states are:
- Online - The DDNS entry is administratively online.
The current IP setting for this entry is shown with a timestamp.
- Taken Offline Locally - The DDNS entry is administratively
offline. If the entry is Enabled, the action configured in the Offline
of the Advanced tab is taken.
- Abuse - The DDNS provider has considered the type
or frequency of updates to be abusive. Please check with the DDNS provider's
guidelines to determine
what is considered abuse.
- No IP change - abuse possible - A forced update
without an IP address change is considered by some DDNS providers to
Automatic updates will
only occur when address or state changes occur. Manual or forced
should only be made when absolutely necessary, such as when registered
- Disabled - The account has been disabled because
of a configuration error or a policy violation. Check the profile's
and verify the DDNS
account status with the provider.
- Invalid Account - The account information provided
is not valid. Check the profile's settings, and verify the DDNS account
status with the provider.
- Network Error - Unable to communicate with the DDNS
provider due to a suspected network error. Verify that the provider
is reachable and online. Try the
action again later.
- Provider Error - The DDNS provider is unable to
perform the requested action at this time. Check the profile's settings,
the DDNS account status
with the provider. Try the action again later.
- Not Donator Account - Certain functions provided
from certain provider, such as offline address settings, are only available
to paying or donating
subscribers. Please check with the provider for more details on which
services may require payment or donation.
- Enabled - When selected, this profile is administratively
enabled, and the SonicWALL security appliance will take the Online
Settings action that is configured on
the Advanced tab. This setting can also be controlled using the Enable
this DDNS Profile checkbox in the entry's Profile tab. Deselecting this checkbox
will disable the profile, and no communications with the DDNS provider will
occur for this profile until the profile is again enabled.
- Online Settings - When selected, this
profile is administratively online. The setting can also be controlled
using the Use Online
Settings checkbox on the entry's
Profile tab. Deselecting this checkbox while the profile
is enabled will take the profile offline, and the SonicWALL will take the
Online and Offline setting actions that
are configured on the Advanced tab for the entry.
- Configure - Includes the edit icon for configuring
the DDNS profile settings, and the delete icon for deleting the DDNS profile
Configuring Dynamic DNS
Using any Dynamic DNS service begins with settings up an account with the DDNS
service provider (or providers) of your choice. It is possible to use multiple
providers simultaneously. Refer to the links for the various providers listed
above. The registration process normally involves a confirmation email from
the provider, with a final acknowledgment performed by visiting a unique URL
embedded in the confirmation email.
After logging in to the selected provider's page, you should visit the administrative
link (typically 'add' or 'manage'), and create your host entries. This must
be performed prior to attempting to use the dynamic DNS client on SonicOS.
Click on the Add button displays the Add
DDNS Profile window.
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