Right, you need to get a cat5e patch cable long enough to go between the router and the DVR. Both ends of this cable will be RJ-45 Male. Plug one end of it into the DVR (there will be a socket with 'ethernet' or 'network' or 'RJ-45' or a small picture of a few computers connected together). There will probably only be one socket it will fit into, this will be the right one. Now run the cable to your wireless router and plug it in at the back (probably) into a similar socket (most wireless routers have 4/5 ethernet sockets - known as a switch).
That's the extra wiring done. Now go to a computer that is on the same network (a computer that you use the same internet connection for, and, I'm assuming you're on a windows machine) and find an icon in the taskbar (bottom right corner) which looks like either a computer with a couple of waves coming out of it, or, two computers, one on top of the other. If windows doesn't manage your network, there will be another icon which indicates network activity, this will work too. Double click on the icon and find the information you need (for a windows managed network, click the 'support' tab). Now, take note of the 'default gateway' and possibly the 'subnet mask'.
Now you need to configure your wireless router. When you initially set your router up, you will have gone to a website by typing in something like 'http://192.168.1.1' (this is the IP address for the gateway you have just gotten) into the URL bar of your web browser. Do it again now and find, by looking through the presented menu, the following:
1) DHCP
Look in the list of devices and note the next available IP address (i.e. if '192.168.1.2' and '192.168.1.3' are taken, the next would be '192.168.2.4'). This will be the IP address of the DVR.
2) Virtual servers/Virtual services/Port Forwarding or similar
Create a new rule/service/forwarding or whatever to the IP address you just got from the DHCP list (as above). Unless you run a webserver at home (which I doubt you do, otherwise you'd know how to do this) set the port as 80 (and, if asked, the protocol will probably be TCP)
3) This one is only necessary if you have set up MAC address filtering (you probably haven't), if you have, you'll know. Make sure the IP address we just found is entered into a list of allowed devices on the network.
That's us done on the router, now go to the DVR's menu as your instructions say and enter the IP address we just got as the devices internal IP address. For the gateway, enter the IP address of one of your computer's gateway, this will be the same for all devices on the network (from earlier).
Now you should perform a couple of quick checks:
1) in your web browser, enter 'http://' followed by the IP address of the DVR (from the DHCP bit earlier). For example: 'http://192.168.1.4'.
You should a screen with something about your DVR, the rest should be intuitive from here. I can't help on the web interface of the DVR. It's something I have no experience in.
If that worked and you were able to watch your CCTV, then:
2)
In your browser, go to ' http://whatsmyip.org/ ' and then go to 'http://' plus the IP address at the top of the ' http://whatsmyip.org/ ' page. Something like: 'http://90.241.34.67'
If all goes to plan, you should see the same page as you did when you typed the DVR's internal IP address into your browser.
If both worked, you're pretty much done. The last thing to do is set up a dynamic DNS address. All this does is point some words (probably 'yourname.dyndns.org') to your external IP address (the one you got from ' http://whatsmyip.org/ ') so 1, you don't need to remember the numbers and 2, when your external IP address changes, you don't need to remember a new number.
To set it up, go to ' http://www.dyndns.org '. On the page presented, find 'create account' (top left) and click it. Fill in all the information. Make sure you check 'i will only create one free account' so you don't need to worry about paying.
You will probably get a confirmation email or something to activate your account. Activate it. Now log in to DynDNS and click 'Account' at the top of the page. In the leftmost column of the main page (not the menu) click on the hyperlink that says 'Add Host Services' under 'My Hosts'.
Now enter a 'hostname', I used my surname for my host. Now pick a domain from the drop-down box, any will do. If the hostname is taken on one, choose another. Remember both your hostname and the domain you chose. Leave the rest of the settings as they are except the IP address one. Click the link that says 'Use auto detected IP address xxx.xxx.xxx.xxx'. The textbox for the IP address should be filled with the external IP address you got earlier ('whatsmyip.org'). Then click 'create host'. I think that's it then, I couldn't go any further since I already have my free host set up.
Now if you point your browser to 'hostname.domain' for whatever you selected earlier ('http://yourname.dyndns.org' for example). You should see the same page you got with the DVR's IP address and your external IP address (from 'whatsmyip.org').
If that worked, that's pretty much it; apart from the fact that if your external dynamic IP address changes, which it will, 'yourname.dyndns.org' wont point to your network anymore. Go to ' http://www.dyndns.com/support/clients/ ' and download the one for your operating system (probably Windows). Save it to somewhere on your computer that you'll remember, and once it's finished downloading, find the file and double click on it. Install it with the default options and configure it to suit the details you've just gotten from 'dyndns.org'.
Now, every time your computer starts, this application will launch and update IP address stored by 'dyndns.org'. All you have to remember now is your version of 'yourname.dyndns.org'. Just type that into your browser and away you go.
Hope that helped, I tried to make it as simple as possible whilst including some technical language. I think I managed to cover everything here, if I missed something, please let me know. If you have any issues getting it working, please don't hesitate in contacting me.
Chris