DDNS Question

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stimpson

stimpson

Miller Lite Tester
Original poster
Oct 2, 2006
4,701
46
Benton, Arkansas
I have a new router that has the option to set up DDNS (free). My old router did not have that option, so I set up an account at DYN.com (25 bucks/year) for my security cameras and an indoor IP camera. Each with their own hostname. My question is, if the router is running the DDNS client, will the devices behind the router still be viewable externally when my public IP changes, thus allowing me to cancel the account at DYN.com?
 
No the router with its client watches your ip address and alerts your DNS service whenever the IP address changes, thuse stimpson.dyn.com always answers at home. :)
 
What purpose does that serve exactly, and what does that do for me? The main reason Im asking is my new router is an Asus RT-AC66U. Asus has an app called AiCloud and it uses the DDNS setting you set up in the router to internally or externally access your network, to include connected computers, HDD, ext. It works great when i'm in my network, but will not connect external.
 
Your ISP gives you an IP address for your use, For this example lets say that number is 210.210.210.5. You want an easy to remember address such as stimpson.dyn.com so you don't have to remember the 210.210.210.5 number. With the DDNS service on your router it lets DYN.COM know that your home IP address is currently 210.210.210.5 so stimpson.dyn.com is connected to that address.

Now because your ISP often changes IP addresses, your home IP could change tomorrow to 210.210.210.120, when your router detects this change of IP it updates using its DDNS app your DYN.COM account, so that even though your IP changed,if you go to stimpson.dyn.com still gets you to your home, meaning you can still access your security cameras and other servers without needing to reconfigure everything for the new IP address.

Thing of DNS as a big phone book You want the number to stimpson.dyn.com the DNS server looks up your record and sees that your "phone number" (or in this case IP number) is 210.210.210.5. This way you dont need to remember ip addresses to access any site.

Imgaine if you wanted to come to SatelliteGuys and there was no DNS system, you couldn't enter www.satelliteguys.us instead you would have to enter 67.225.170.216 to get here. I think you would agree its much easier to enter www.satelliteguys.us to get here then 67.225.170.216. :D :D
 
Scott Greczkowski said:
Your ISP gives you an IP address for your use, For this example lets say that number is 210.210.210.5. You want an easy to remember address such as stimpson.dyn.com so you don't have to remember the 210.210.210.5 number. With the DDNS service on your router it lets DYN.COM know that your home IP address is currently 210.210.210.5 so stimpson.dyn.com is connected to that address.



Understand that.:)



Now because your ISP often changes IP addresses, your home IP could change tomorrow to 210.210.210.120, when your router detects this change of IP it updates using its DDNS app your DYN.COM account, so that even though your IP changed, if you go to stimpson.dyn.com still gets you to your home, meaning you can still access your security cameras and other servers without needing to reconfigure everything for the new IP address.



I think its only for servers, and usb connected drives, not the cameras. I can only view my cameras with their respective apps. In their apps is where the DYN.com settings are.
Click to expand...


Sorry for all the questions and difficulty understanding this. Also, it says I can add up to 30 more hostnames to my account at DYN.com. Does that mean I can that many, if needed, on my home network? I think I read some where there is a limit for home networks.
 
Yes let say you want one for cameras.dyn.com for your security cameras...
slingbox.dyn.com for your slingbox
fileserver.dyn.com for your file server etc...

Just let you make easy to remember names. :)
 
Easy to remember is not what I feel is the main benefit of DDNS. Most people have DHCP ISP service and like you said, Scott, the ISP can change the IP without notice making it difficult to access your security cameras from outside your LAN. You should check with your ISP to see what they charge for a static IP. Here it is too expensive when compared to the standard service. So that leaves me with two options, DDNS or DHCP. Now I also have a service I have been using for some time. It is called Logmein.com. They have a free version. This allows me to get into one of my computers from my ipad or any remote PC when traveling. If I happen to be away from home and my ISP changes my IP address. I can log in to Logmein.com and launch my browser. Then type in the web site www.WhatismyIP.com. It will give me the new IP. With that I can update my security cameras access from anywhere. Basically, the static IP or DDNS is the simplest but these often co$t a premium. If you have standard ISP service and suffer IP roulette, and can access your computer with one of the existing services, then using Whatismyip.com may be a lower cost alternative.

Also, recall Scott, what you told me about how often these IP's change? It's interesting, but here, my IP hasn't changed since May.
 
If your camera's are set up with NAT behind your router, the router changing will be fine.

What I do here is:
router has lrosenman.dyndns.org as it's DynDns.org host name and is also CNAME'd to home.lerctr.org

on the router I have port translations for those things I want to reach from the outside, I.E.

22 goes to 22 on my FreeBSD host
8090 goes to 8090 on my IPMI card
and some others for bacula, etc.

everything can be reached as home.lerctr.org and the appropriate port.

Does that help?

What are the camera's IP'd as?
?
 
Unless you have unique Internet IP addresses for each of your devices (this usually costs a tidy sum and the addresses are static) and they're all on the uphill side of your router, dynamic DNS hosts will all point to the same Internet IP address -- your router.

DynDNS comes into play when every device has its own dynamic Internet IP address. Typically this means multiple physical addresses.

I suppose you could use DynDNS to get around having a domain registration, but a conventional domain would probably be cheaper.
 
stimpson said:
Ok. So the router DNS setup is solely for getting into the router externally, and not for the devices behind it?
Click to expand...
In that the devices on the LAN side of the router all share the router's Internet IP address, yes. You still have to use port forwarding to get to the device in question.
 
Slingbox has always had a way to know what the DNS is should you want to use it to reach your slingbox instead of going through their servers. Or it provides a free way to get that info for other things. (Can't use the address only for Android apps but can for the computer slingplayer.)

http://srs.slingmedia.com/getDeviceInfo.asp?id= And enter your device ID.
 
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