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As the IP address may change frequently, corresponding domain names must be quickly re-mapped in the DNS servers to maintain accessibility using a well-known domain name.To this end, many providers offer commercial or free DDNS service for this scenario, with reconfiguration generally implemented in the user’s router or computer.
At “MX“, set your MX record if you need one (thus allowing you to configure your subdomain for email routing) and if your service supports it. This is useful if the domain name specified is not a fully qualified domain name (FQDN); for example, if your DDNS address is myplace.and you enable wildcards, then x.myplace.will work as well (x is the wildcard).The Web is full of articles on how to setup BIND9 on different GNU/Linux distributions so I will not cover this topic at all.What, on the contrary, I found a little bit more complicted to do (not too much to be honest, but still worth to talk about) is how to have a DHCP server running on a different hardware to update the DNS entries everytime a new device asks for an IP.Depending on the provider, the hostname is registered with a domain owned by the provider or the customer’s own domain name.These services can function by a number of mechanisms. The provider might use RFC 2136 to update the DNS servers (more on RFC 2136 later).