How to configure DVR to access via Internet

Hi,

I have to configure a DVR such as I can access it via the Internet and see what is happening at my home. The connectivity at my home is attached along in a jpeg image. Kindly help me how I need to configure both the Modems so that I can access the DVR from Internet. I have a dyndns account as well. Kindly let me know in case of any inputs required.
connectivity.jpg
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Vipin KumarSr. Network EngineerAsked:
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RantCanSr. Systems AdministratorCommented:
NAT a specific port for DVR management through DynDNS.
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Vipin KumarSr. Network EngineerAuthor Commented:
can u tell me how to achieve this.
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RantCanSr. Systems AdministratorCommented:
Sorry. I got interrupted in my response. What I meant was that you will need to make your DVR respond on a specific port (call it 4680), and your ISP modem should do simple NAT, so set a route based on that port. If type in your DynDNS address/hostname:4680, your DVR should present its page. Since you have a router-behind-router setup, I think, it's gets more complex but not much, you just need to NAT again. Your ISP router might also call this port-forwarding, but the result is the same.
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madunix (Fadi SODAH)Commented:
http://www.dyncommunity.com/questions/426/how-do-i-access-my-device-from-outside-my-home-net.html
http://www.yougetsignal.com/tools/open-ports/

The Open Port Tool or this one allows you to check if port-forwarding on your router is correctly configured, and your application is listening on the related port(s).
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masnrockCommented:
What model DVR do you have? Also tells us what model router you are using at home.
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Vipin KumarSr. Network EngineerAuthor Commented:
the modem that I am using is Binatone DT 815. it has a option of Virtual Server, DMZ and Port Trigerring
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masnrockCommented:
We still have need to know what model DVR you have.
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Vipin KumarSr. Network EngineerAuthor Commented:
I haven't decided on the model of the DVR. If you could help how should I configure the modems that I have shown in the diagram that is attached with the question.
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masnrockCommented:
You need to set up port forwarding on your router.  Which ports you need to forward vary by the model of the DVR, hence why I asked which model.

Here is a sample set of directions for one model of DVR. DVR Port Forwarding

Bear in mind that your port forwarding rules will differ a bit because the ports vary a little bit from model to model. Some DVRs support DynDNS, but not all. Others may support a different service. You'll follow the dynamic DNS service's directions for configuring your account. And the DVR's instructions for putting your dynamic DNS account's information.
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Vipin KumarSr. Network EngineerAuthor Commented:
I've requested that this question be deleted for the following reason:

Not able to find any thing which provides a resolution so closing the question
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RantCanSr. Systems AdministratorCommented:
The answer is port forwarding and has been offered by two experts, so at the very least partial points should be divided amongst the contributors.

In the OP scenario (according to the provided illustration), the port forwarding would be on ISP Modem, through the DMZ, to "Self Modem" and then again forwarded to DVR Device on port 8000.  For example, were I to set up port forwarding on DDNS hostname "foo-bar.com" on 8000, when I connect to foo-bar.com:8000, I should be presented with the DVR Access page.  This is what happens in the background:
1. DDNS resolves hostname to ISP router(192.168.0.1), who sees query on port 8000.
2. Port forwarding rule is triggered to move query through DMZ (192.168.0.0) to 192.168.0.11 on 8000;
3. Which triggers port forwarding on router on the other side of the DMZ for port 8000;
4. This router forwards port 8000 to internal device 192.168.1.40, which then presents the access page to the browser on the internet.

This illustration assumes the switch is not layer-3.
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