Editing Dynamic DNS (section)

=== Applications ===
In [[Microsoft Windows]] networks, DDNS is an integral part of [[Active Directory]], because [[domain controller]]s register their [[SRV record|network service types]] in DNS so that other computers in the domain (or forest) can access them.

Increasing efforts to secure Internet communications today involve encryption of all dynamic updates via the public Internet, as these public DDNS services have been abused increasingly to design security breaches.  Standards-based methods within the [[DNSSEC]] protocol suite, such as [[TSIG]], have been developed to secure DNS updates, but are not widely in use.  Microsoft developed [[TSIG#Alternatives to TSIG|alternative]] technology ([[Generic Security Service Algorithm for Secret Key Transaction|GSS-TSIG]]) based on [[Kerberos (protocol)|Kerberos]] authentication.

Some [[Free software|free]] DNS server software systems, such as [[dnsmasq]], support a dynamic update procedure that directly involves a built-in [[DHCP]] server.  This server automatically updates or adds the DNS records as it assigns addresses, relieving the administrator of the task of specifically configuring dynamic updates.

==== DDNS for Internet access devices ====
DDNS providers offer a software [[Client (computing)|client]] program that automates the discovery and registration of the client system's public IP addresses. The client program is executed on a computer or device in the private network. It connects to the DDNS provider's systems with a unique login name; the provider uses the name to link the discovered public IP address of the home network with a hostname in the domain name system. Depending on the provider, the hostname is registered within a domain owned by the provider, or within the customer's own domain name. These services can function by a number of mechanisms. Often they use an [[HTTP]] service request since even restrictive environments usually allow HTTP service. Most providers have an API similar to a first provider DynDNS (Dyn.com) so it's often called DynDNS2.

Many home networking [[Residential gateway|modem/routers]] include client applications in their [[firmware]], compatible with a variety of DDNS providers.

==== DDNS for security appliance manufacturers ====
Manufacturers of various security devices, such as IP cameras and [[digital video recorders]] (DVRs), can make use of DDNS services to ensure the IP addresses of their devices are automatically associated with the correct domain.<ref>{{Cite web |url=https://www.fortinet.com/resources/cyberglossary/dynamic-dns |title=What Is A Dynamic DNS (DDNS)? |website=Fortinet}}</ref>

In almost all cases, a simple [[HTTP]] based update [[Application programming interface|API]] is used as it allows for easy integration of a DDNS [[Client (computing)|client]] into a device's [[firmware]]. There are several pre-made tools that can help ease the burden of server and client development, like MintDNS,<ref>{{Cite web|url=https://dynamic.domains/|title=Dynamic DNS (DDNS) Server Solutions|date=January 27, 2020|website=Dynamic Domains}}</ref> [[cURL]] and Inadyn.<ref>{{cite web | url=https://github.com/troglobit/inadyn | title=Internet Automated Dynamic DNS Client | website=[[GitHub]] }}</ref> Most web-based DDNS services use a standard user name and password security schema. This requires that a user first create an account at the DDNS server website and then configure the device to send updates to the DDNS server whenever an [[IP address]] change is detected.

Some device manufacturers go a step further by only allowing their DDNS Service to be used by the devices they manufacture, and also eliminate the need for user names and passwords altogether. Generally this is accomplished by [[encrypting]] the device's [[MAC address]] using an cryptographic algorithm kept secret on both the DDNS server and within the device's firmware. The resulting [[decryption]] or decryption failure is used to secure or deny updates.  Resources for the development of custom DDNS services are generally limited and involve a full [[software development cycle]] to design and field a secure and robust DDNS server.