Often it happens that you need to access your PC from outside your home because you need a document, or you want to "send" to house a large file, but even if you have a flat ADSL and your computer is always on you are faced with a problem: the ip of your connection is dynamic, so changes to access or when deciding on your network provider.
To overcome this problem in the Internet are born different services that allow you to map your dynamic IP to a domain and manage the changes that the supplier carries on your IP network, the most famous of these services is just DynDNS .
First a couple of explanations, to understand a little 'more about how the Internet works and how we can take advantage of its features with knowledge of the facts. But the calm I'll just mention, without going into too much technical topics!
What is the ip address?
The ip address is that number (set of numbers) that can uniquely identify a server, just like your home address.
Obviously the language of computers is easy for them, but obscure to us, so we hardly remember the IP address, but more easily remember a domain name eg: www.alice.it
www.alice.it 212.48.10.150 matches, while the domain is very easy to remember, to remember the ip is more difficult.
What is DNS?
So we have these two pieces of information: IP address and domain. Who puts these two pieces of information in reports? Simple DNS.
The DNS server that any program that wants to surf the internet to query to run correctly:
We write www.alice.it in your browser, the browser queries the DNS responds with that 212.48.10.150 address through this and successfully navigate to the site of Virgil.
Simple, fast and convenient for us because it is completely transparent.
The network usually has a home adsl dynamic ip, this association ip <-> domain can not be made through the normal dns, because they expect a fixed IP address that does not change over time.
That's why services like DynDNS are born.
How does DynDNS?
That our computer needs to communicate on a regular basis your ip assigned by the network provider. This communication takes place either through a small program provided by DynDNS or by features of our own home router.
The steps are:
1) There inscribe her to DynDNS and segliamo the name of the domain example miodominio.dyndns.org
2) Configure the client on our computer, or entering data into the feature of our router (solitamenet asks login, password and domain name chosen)
3) Configure firewall and router (if you have one) so that they can effectively reach your PC!
And that's it!
Now you can access your PC, using the chosen service (ftp, http etc etc) by simply writing miodominio.dyndns.org!
-> ATTENTION <-
After setting up your whole computer is in the square 
and everyone can enter!
So I suggest you organize a good security system so as to curb the problems of hacking that could happen to you.
I would suggest:
1) The machine to which access can be "isolated" in the sense that there is nothing else running that service (ftp, http etc etc)
2) There must be a Windows machine
3) Always use complicated passwords
But most of all ...
Keep off the server when you do not need!
Posted under Technology
This post was written by admin on October 6, 2008
Oh yes, great suggestion! Keep off the server if you do not need
I've just registered a domain at dyndns and I have to say that the service works great.
I just have to configure FTP and MySQL access from the outside (by dns and not local).
For the rest everything to perfection, on a celeron with 128 MB of RAM (of course GNU / Debian!)
Keep off the server, will be 'a diminished, but not doing anything except warm peche'
leave it on?
If you must tell me something about your mule, I'm interested!
But service on the site there are 4, which should I choose?
One described in this post and 'the free dynamic dns http://www.dyndns.com/services/dns/dyndns/
Tell me how you feel with this service, some users have found themselves hurt by configuring the router ... it seems that the update is not so 'easy to use and have passed the script on the PC ...
I do not know but whenever I try to access a site I open a page of dyndns it says:
Hostname site is blocked in your defense plan.
how can I fix it????
Have you tried checking the settings of your computer?
I set up a DDNS account x remotely manage a DVR. I also set the virtual server: everything works, but I wonder:
the IP assigned by the router to the DVR, inserted in the virtual server, if it changes, prevents the connection via web DDNS account?
or would that account to access x?
Thank you!