Question about Arris SURFboard SBG900 Wireless Router (DHSBG900)

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Dyndns DNS and Port 800


I have a register DNS on dyndns which works.
Even withotu this, if I use the ISP provided IP address and specify the port for my local LAN side IP camera, which is configured as port 800, nothing gets through.

i.e works fine on the local netowrk.

But if I specify (where xxx is my ISP given IP address) I cannot get to the camera.

I have enabled port forwarding of port 800 in the Router to, and also given a ststic IP address on to the camera (with the camera MAC address as the idenfifyer).

I notice the correct.02 IP address beign assigned to the camera, so the static route works fine, but fro soem reason the port 800 is not beign forward to .02 Ip address


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Re: Dyndns DNS and Port 800

Odds are; you will likely find mdbs_daemon or something on most of your computers on your LAN also doing traffic on this port. It's probably not a good idea to use this value.

From my experience in networks and routing, you are also better off if you can put the port up in the unprivileged region (1024~65535). The reason is that hackers typically spend the time down lower than this and they are looking for known services. It takes too long to scan ports up in the high regions, and you are more likely to be discovered for your activity. Try using port numbers that are strange; eg. 8888 or 5555 and similar. A lot of routers will let you do a "redirect" such as bringing port 8888 on the outside to port 80 on the inside to your device.

Posted on Jan 18, 2008

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I need a static IP address can this happen with this cisco linksys router, Or do I need my ISP to sort it out?

Without your ISP you can't get a fixed IP.
What you can do is a workaround: use if it sufficient to connect to a fix URL with translate a fix domainname into a dynamic IP-Address

Sep 15, 2011 | Routers

1 Answer

Hello, i setup a IP cam. Create an account on for the IP. But now when i type the given url i am linked to the setup of my Thomson router TG585 v8 What can I do? There is nothing else except...

Hi Sten -- There are several non-intuitive things you have to setup with any router and Dyndns to make this work.

On Dyndns you can setup your static or hardly every changing dynamic Internet (external - provided by your ISP) IP address in your Dyndns account settings (Not the internal NAT IP - 192.168.x.x address of the cam). if it changes more often you need a dyndns client.

On the router you have to setup port forwarding to the internal (NAT address ex:192.168.x.x) address of the camera including the port number -- or you could just create a DMZ (feature of many but not all routers) for the internal IP of the cam.

If you've done the above correctly you might want to check the troubleshooting sections at located HERE and HERE.

Happy Networking and Thanks for using Fix Ya.


Apr 15, 2011 | Routers

1 Answer

I have a Buffalo WBMR-G54 ADSL Router. The local IP address of the router is My Medion desktop computer connects connects to my Buffalo router using an Ethernet cable. I use the wireless...

> Zone Alarm free firewall and Avast antivirus have been installed on both computers

Your router is already acting as a "firewall" to block "unsolicited" traffic from reaching the computers on your LAN. So, unless you use Zone Alarm to block "outgoing" connections
(such as a computer-virus would try to make when "calling-home", there's little benefit
to using the Zone Alarm software.

> If I use Internet explorer to connect to, Internet Explorer does connect successfully to the network. However, it invites me to enter the username and password for my Buffalo WBMR-G54 router - not for the storage drive.

While you are "forwarding" TCP port 21, you are not "forwarding" TCP port 80 (as used by the 'http://' protocol). So, when you connect from the Internet to your "public" IP-address, it is the router that responds, rather than one of your computers inside your LAN.

IMHO, it is "bad" that your router's web-interface is "exposed" to attacks from the Internet.
Either "forward" TCP port 80, or configure the router to use a _different_ port number for "remote management".

> If I enter the Router user name and password, that allows me to access the Router menus via the Internet, which confirms that my account at DynDns has translated the IP address successfully.

Correct. Hopefully, you're the only one who knows the correct username/password, and there is nobody that is doing "brute-force" attacks on your router, trying to login to "hijack" your router.

> if I use Internet Explorer or FileZilla to access, I cannot connect to the router

Correct. The 'ftp://' protocol uses TCP port 21, which the router is "forwarding" to one of the computers on your LAN.

> or the storage drive - so I cannot access any of my files remotely.
> FileZilla reports -Status: Resolving address of
> Status: Connecting to
> Status: Connection established, waiting for welcome message

So far, so good.

Is FileZilla expecting a "specific" content in that "welcome" message, or will "any" response be "close-enough" ?

On a computer on the Internet, open a command-line prompt:

Click Start
Click Run
Type CMD
Press Enter
Enter FTP
Press Enter
Do you get a "connecting" message?
Do you get a "connected" message?
Do you see the "welcome" message?

Note that the FTP protocol usually uses _two_ ports for File Transfer:

* port 21 for "control" (sending/receiving commands/responses)
* a "random" port for "data" transfers (including directory-listings)

It's this "random" port that your router is not forwarding.

However, some FTP-clients (probably including FileZilla) and some FTP-servers
support "passive" mode, where both the "control" and the "data" connections "share" port 21.

So, configure FileZilla to use "passive" mode, and _hope_ that your FTP-server supports "passive" mode.

Jan 06, 2011 | Buffalo Technology WHR-G54S Wireless...

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I have a zyxel p600 series modem connected to a Belkin wireless router. I am trying to run a web server on port 80. The modem was using port 80 for access to the internal settings. I changed that to...

Your setup looks correct to me. It might very well be that your ISP is blocking port 80. Go here and check from your server if port 80 is accessible.

If you are the only one that wants to connect to you server, you can simply choose another port to use, i.e. Set port forwarding form port 80 to 801 in your router.
TCP&UDP - from 801 - to 80 - [serverIP] - [Webserver]

The better way is to use a service like or You can register a DNS name (like, which redirects to your public IP. The trick is to update your IP address, so even if you have a dynamic IP assigned from your ISP, the redirect will point always to your server. Most routers have the ability to set up with DynDNS, so the process runs in the background and you don't have to update manually - check your router manual.

The second part of this beauty is the redirect to a different port. So even if your port 80 (and 25 for that matter) are blocked, you don't have to have an arbitrary number in your URL (http;// You can find more detailed information here.

For a quick check, change your webserver to run on port 801, enter the redirect in your router and see if you can get to your server from the outside (internet). If you still can't access the webserver, the problem is not a blocked port.

Hope this helps, but if you have any more questions, just come back here and leave a comment - I'm happy to help you figuring this out.

Oct 23, 2009 | Routers

3 Answers

DNS help...

DNs (Domain Name System)
DNS is used for resolving mapping between IP addreses and host names.
Means when you quary for computer only recognize bits and bytes format so but dnd resolves this isssue when it got quary it send request to ip addreses of
If you change dns ip to that then all quary goes to tht dnd server if it has info for your quary then it forwards to there other wise you get page not found.

Aug 22, 2009 | 3Com 3CR858-91 Office Connect Cable/DSL...

1 Answer

How to watch IP Camera on internet by using DSL-2640T??

let me give you few suggestions and then you can take it from there.

firstly IP camera is just what its name needs a fixed IP address it may be local as in your lan where it is working or a IP address from ISP.
Now when you connect it behind router... it is essentially a camera connected to LAN.
now the problem is will give access to your router since that is connected to dynamic IP addressing. However Ip camera is behind router and to access it you need to open proper protocol and port in router .consult your router manual for doing that.

with your current setup that is the only solution. however you can connect Ip camera directly to ISP line and then use dyndns as in case of router. though i dont know how feasible that will be for have not mentioned IP camera model so cant help with specific details.

Aug 05, 2009 | D-Link ADSL2/2+ Modem/Wireless Router...

1 Answer

Remote manage a DSL 504T router

If you have a dynamic IP on your wan port you shall register a domain name and register it with dynamic DNS, provide your dynamic dns name in your DSL router so that you shall connect to your DSL router by calling the registered dynamic dns name from any where (you should have internet connection).

1. Register a name in
2. update this on your dsl router

Wait for some time,

3. access the registered name from anywhere using a browser

Jun 09, 2009 | D-Link DSL-504T/EU Router

1 Answer

Can't configure router for Domain name and DNS

dns= domain naming service or something alike...
you don't have normally to anything to your router other than allowing incoming traffic to port 80...once you do that, you should be all set..frrom your computer at home if you type your domain name, your pc actually goes to the internet clowd and accesses you new domain name based on the info gathered by dyndns...then comes back to the ip that your ISP assigned you and hits your webserver...

A couple things to consider;
keep an eye on the ip assigned to you by the ISP..if it changes by DHCP your webserver won't be seen by the outside..

on your side of the home network, assign a static ip address, don't use dhcp as well to avoid the same problem on the pc that you have the webserver. your router should allow you to allow traffic on port 80 to your webserver computer, which has the static IP...
if it does not, buy another one

Feb 07, 2009 | Buffalo Technology AirStation WBR2-G54S...

1 Answer

Port Forwarding for Apache Server

Hi Robmoll,
Let's get a little bit more in detail. I'm doing the same exact thing you are trying to do with a D-Link DI-624 and I'm using NO-IP instead of DynDNS. I'd like to ask you a question, if I may, what are you actually seeing now using port 80 and how did you disable it? Can you connect another PC to the same router (making a small Home Network) and test locally your Apache and eventually your web-page by typing something like this ""? Are you already able to see your router from the "outside" trough port 8080? Are you specifying your "private" IP in the port forwarding setting of your router? Do you mind showing a snapshot of your port forwarding settings? Here is mine; you see two different IP's because there are two PC connected.


Oct 26, 2007 | Actiontec GT704WG Wireless Router...

1 Answer

Update DDNS automatically

Dynamic DNS (Domain Name Service) is a method of keeping a domain name linked to a changing (dynamic) IP address. With most Cable and DSL connections, you are assigned a dynamic IP address and that address is used only for the duration of that specific connection. To properly configure the DDNS feature follow the steps below: Step 1 Log into the web based configuration by typing in the IP address of the router (default: in your web browser. The username is admin (all lowercase) and the password is blank (nothing). Step 2 Click on the Tools tab and then click Misc. If you have the DI-614+ with firmware 2.30, click on Tools > Parental Control. Step 3 Enter the required information under Dynamic DNS: Server Address: Enter the IP Address or domain name of your DDNS server (IE Host Name: Enter the Domain name that you registered with your DDNS service provider, (IE Username Password Step 4 Click Apply and then Continue to save your changes.

Feb 16, 2006 | D-Link Express EtherNetwork DI-604 Router

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