Question about D-Link ADSL2/2+ Modem/Wireless Router 4-Port Switch, 802.11g, QoS (DSL-2640B)

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D-link DI-604 Dear experts, Need to ask some questions that might relate to my problems : 1) I have a dial-up router provided by ISP and I connect the DI 604 to it to serve as firewall. 2) At WAN Static IP settings, may I know: 2a) IP address - what should this refer to? 2b) ISP Gateway Address - what should this refer to? My problem: P1) as according to the information from our ISP, the WAN IP is different at the DI-604, so do not know whether this cause my P2. P2) our internet always affected after sometimes running. So, shall it due to the DI-604 F/W problem which I might need to upgrade it?

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  • joan_lim Feb 27, 2009

    Dear Mr HiddenShadow,

    Sorry for not explaining well.

    You are right that I have an external router connect to phone line (adsl) and from the Quidway router, and Quidway router will have a LAN connection to the D-link DI-604. And from DI-604 it again connect to a swtich to work for my office networking.



    So I believe that the ISP IP has already done by the setting at the Quidway router. But I have no idea what was the settings at the D-link setup as Static IP with it. So, with this, do you propose that the setting shall change it to Dynamic?



    Currently I resolve my problem by reset the D-link when there is intermittent or lost communication happened...but it is quite often and that is why I need to know the actual cause.



    Thank you.

  • joan_lim Feb 27, 2009

    sorry, is: (phone line in) Quidway Router>D-Link Router

  • joan_lim Mar 02, 2009

    Dear all experts,

    Thank you for all the solution and explanations. I was having doubts on the settings as well when I joined this company after it was being implemented by the HQ. But I was not allow to make any changes without their permission... and until today, there is no reply on why they do it that way..! so, I can only continue resetting the D-link router once intermitten happen..

    thank you so mcuh.



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I didn't quite understand what you meant but Ill explain some stuff you to that might help.

From what I understand you have a dial up router/modem, which is external (outside of your computer/seperate), and you hookup your phone line to it, which then connects into your DI-604 WAN port.

WAN Static IP settings are related to the settings given by the ISP that stay constant. There are 2 types of IP, static and dynamic. I think dial up is dynamic, since you have to connect/disconnect through the phone when you want to get on, this causes the ip to change at each reconnect, unless your ISP treats it differently.

I have no idea what you want to get out of the WAN static IP settings, but this should be handled by the dialup router/modem it self, and generally you dont have to manually enter the static ip, unless the ISP requires it, in that case you would enter this stuff there. The ISP Gateway Address refers to the ISP's router address/modem, I think, since I never heard the term before.

After "My problem:", I didn't understand your problem and can't give you further info until you clarify. Also if you internet is fully connected and working, and you still have problems then you could try resetting the router, by holding the reset button for 10 seconds. This will erase all settings. If that doesn't help try unplugging the router, then holding the reset button for 5-10 seconds, then plugging it in at the same time, then it should be fully reset, unless I forgot how it was supposed to be reset. ( I used to have the same router)

Posted on Feb 27, 2009

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  • Denis K. Feb 27, 2009

    Ok, so its like this ADSL Modem>Quidway Router>D-Link Router

    Theres absolutely no need for 2 routers. Routers already protect your pc since intruders can't enter a computer on the network directly, since a connection to a PC will need a port. And that port must be 'open' and forwarded, or directed to go to that specific computer, in order to make an attack. Im not sure about the quidway, but the dlink does this for sure. (Quidway most likely does too)

    Each computer connect to the router gets a Local ip, which is usually like 192.168.0.xxx (xxx being any 3 digit number). Inorder for say a program or a virus to be communicated from the 'outside world' or the internet (incoming connections) it would have to be directed to your computer from the router. Routers do not have any ports forwarded as default, so any incoming connections needed by programs and made by other means, like using a common port for example port 80 which is normal internet (browser) connections. So for a attacker to gain access to your computer it would have to be DMZ (demilitarized zone) which opens all ports for 1 computer on your network, similar to connecting a computer directly to your adsl modem, its completely vulnurable. Or the specifc port the attacker uses needs to be forwarded or directed from the router to your specific local ip address.

    Hope that made sense, now for getting rid of the 2nd router and how to get the settings..

    Try connecting a computer on the dlink router to the quidway. Next grab its user manual and find the ip address used to get into it's settings. If you don't have it, go to start>run>type in cmd then OK/enter. In command prompt type in: ipconfig. The default gateway is the address to the quidway router. (If computer is connected to quidway router, otherwise it will show the dlink address)

    Next gain access the the router by putting the gateway address in a web browser as you would with your dlink, and find the static/dynamic ip settings (which one ever it is set at). Should be found in internet net settings, WAN settings, network settings, router, or similar. Copy them down. Also, find the MAC address being used as or cloned as the routers MAC Address. It could be possible that it has no 'clone' function and is simply on the bottom of the router. The MAC Address serves as a idenifcation number or serial number (like on other electronics, etc) for identification by the router to setup a static local ip, so your port fowarding will not be 'forgotten' or not work anymore. In the case of your ISP (Sometimes) it is used to identify registered pc's (or a router) to be used on their network. Sometimes they won't use your MAC address and just let you use any MAC address.

    Once you get this info, make sure you copy it down and unplug everything from the quidway router and put everything onto the d-link. Now you have to go into your dlink settings and change to the settings that were on the quidway, so you ISP/router would work normally.

    However if the internet connection is lost on the quidway, then I said all this for basically nothing, but if it was the dlink causing the problem, it was most likely since its 2 routers connected to each other. Just use the dlink, once you transferred the settings.

    I hope this helps, both for your problem and understanding of routers!


  • Denis K. Feb 27, 2009

    Edit/note: You should check with your ISP and see if a MAC address makes a difference, if they do check or authenticate with it, you have to make the dlink the same MAC address as the quidway (clone it), it should be somewhere in the settings. If they don't authenticate with a MAC Address, just try without changing or cloning it on the dlink, but do get the other settings, if any.

    Hope to hear back soon.


  • Denis K. Feb 27, 2009

    So, you have no choice but to use the quidway router, since it functions as a ADSL modem, and a ethernet router.

    You could try just only using the quidway router, if you still not trustworthy of its security, you can try reading the manual and checking if it has any security options.

    Alternatively you can get a ADSL modem only, and connected the way I told you above.

    Other than that, I don't think theres anything you could do. Also try looking for something called DHCP in your quidway router and assign your dlink router a DHCP reservation, (or something along those lines). There should be a DHCP client list, if the dlink router is shown up there, there you should have no problems. If it isn't, try getting on that list by adding it as a DHCP client.

    Hope this works!


  • Denis K. Mar 02, 2009

    Not dear all experts, only expert (me) :P, and your welcome!

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