Dynamic DNS with Static DNS

My Website and Email are already being hosted by a reliable company. That hosting company also manages my DNS. Everything works perfect.

Meanwhile ...
In my home office, I got the brilliant idea to set up an FTP Server.
I want to put the FTP Server in a DMZ so I purchased a ZyXEL USG 50 Firewall.

The firewall is set up. So far so good.

Now ... for people on the outside (my clients) to be able to connect to my FTP Server, I would like to create an A Record  ftp.mydomain.com that points to this server.

The problem is, my ISP didn't give me a static IP address.
I figure I can just set up a Dynamic DNS (DDNS) account with dyn.com but this is where I get stumped.

If my web hosting company is already hosting the DNS for my domain (my website, my email, etc), how can I introduce Dynamic DNS?

I only want to use the Dynamic DNS Service for my FTP Server.

Do I have to move ALL of my DNS records over to dyn.com? Is this the only solution?

Or ... can I leave my DNS with my web hosting company, and create some sort of record on there, which in turn points to Dynamic DNS, which in turn points to my FTP server?
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ecarboneAsked:
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agonza07Connect With a Mentor Commented:
Sorry, DynDNS requires the domain be hosted at their end in order to update your A records.

Check with your current provider and see if they provide DynDNS services. Some do as part of their offering.

If that doesnt work, a couple things I can think of here for you.

1) Get a static IP. Usually about $10-20 extra a month.

2) Find out how often you IP address changes. If it doesnt change that often, then maybe manually updating your DNS A record may not be such a bad thing. I've got a customer whose IP has not changed in over a year. He uses that IP for remote DVR viewing, so its not that important if it changes for him.

3) create a new domain name at dyn.com, use that for your FTP address.
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ecarboneAuthor Commented:
One additional note ... I realize I can call my ISP and get a Static IP Address, but they probably charge an obnoxious monthly fee. I'll find out for sure but just in case, I wanted to know what my options are.
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agonza07Commented:
Also depending on your DNS provider, you might be able to script something.

Check this out with enom.

http://edoceo.com/creo/enom-ddns
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ecarboneAuthor Commented:
Option 3 looks promising ... So I think what you are saying is, I can create a new domain (something like companyx-ftp.dyn.org), and that becomes the FQDN for my FTP Server?

To take that a step further ... over on my current DNS (for my real domain name), can I somehow create a record  ftp.mydomain.com that FORWARDS to  companyx-ftp.dyn.org, which in turn resolves to my FTP Server?
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agonza07Commented:
Yes to both.
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ecarboneAuthor Commented:
I ended up getting a static IP from my ISP. This ends up costing me more money per month, but it's the most straight-forward solution. Thank you for your guidance!
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