Question about NetGear ProSafe 16Port Gig Smart Swit (GS716T200NAS)

2 Answers

I am installing GS716T-200NAS switch, which is Netgear ProSafe 16-Port 10/100/1000 Gigabit Switch. And At the time I am using Netgear RangeMax Dual Band Wireless N Router (WNDR3700-100PAS). My problem is that after I plug in all the computers into the switch. The PCs are searching internet first and trying to get online. After a while, the switch will turn all the lights on and off so that all the PCs already plugged in dropped internet. The process will happen over and over again. I have brought the Swift back to the retail store and tested that it was working very well over there. So did the router. However, in my place, they did not work out together. Do you know what is wrong with this?

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  • adam_liu_can Nov 06, 2010

    wait a sec, you just said, the connection should be from modern to switch and then to the router? I guess the sequence should be from modern to the router and then to switch. So I did in this sequence: use CAT5e cable connect the Roger modern to the router at the port of internet, and then connect the router at Port 1 of Ethernet to the 15th port of the switch, and then plug the 4 Desktops and 1 Laptop and 4 VOIP phones into the switch.

    Is this wrong?

    FYI, the router has 4 ports, and the switch has 16 ports.The reason I bought this router and switch is that the router has a feature of Qos which is to put voice data transmission on the top priority. So does the switch. If I put into this way (modern-->switch-->router/computers), it seems the router is useless to control the voice transmission quality while too much downloading and uploading. That is my logic.

    Thank you for your prompt response.

  • adam_liu_can Nov 06, 2010

    The switch and router did work out for one time, just one time. I plugged one desktop and one laptop at that time, and tried to reset the switch settings and reboot the modern, switch, router together. Somehow it worked well. However, if I continued to plug in new computers, the switch didn't even turn the lights on, which means it didn't recognize the new devices. Why? The switch is high smart switch, which is triple expensive than a normal one. Do you think it is defective?



    Someone else says it is loopback problem, which implies I connect the devices in a wrong sequence.

    My sequence is Modern--> router ---> switch --> computers. How do you think?

  • adam_liu_can Nov 06, 2010

    Hi Stelios, even when I plugged in anyone of my computers first ( I have tried 1 desktop and 1 laptop), the switch will reboot itself once for a while. BTW, after plugging in one computer, the switch does not recognize the other computers, if I continue to plug in the others. How do I know it? those lights of switch dont even turn on after my plugging in new port.

  • adam_liu_can Nov 06, 2010

    Hi Stelios, thank you for your prompt response. I have tried the following.

    disconnect any connection from the router to the switch and just connect the switch to one of my desktop. In this case, the switch doesnt reboot itself. In according with the switch manual which asks me to set the switch IP into 192,168.0.239 in the absence of DHCP server, I tried to set the computer IP address into 192.168.0.13, Subnet mask into 255.255.255.0, Default gateway into 192.168.0.239. I can finally find out the switch and even can log on the switch configuration main window. It looks like the connection from the switch to the computer is good. It also works well if I plug into the other ports. The switch light is green and I can log on to configure all the time. However, if I choose to auto attain IP, the computer can not find the switch.

    As mentioned, It seems to me that the problem locates between the router and switch. I am using the wireless connection between my laptop and the router right now to post the message. the fact that the wireless connection is stable means the router is working well.

    How do you think?

  • adam_liu_can Nov 06, 2010

    In the IP configuration of the switch Box, it has several options:1) Dynamic IP address (DHCP) 2) Dynamic IP address (BOOTP) 3) static IP address. For a static IP address, you have to flll in IP address, subnet mask, and default gateway. Where to disable the DHCP feature of switch box?

  • adam_liu_can Nov 06, 2010

    I Just log into my router's configuration. The router setting is like this: 1) Use router as DHCP server. Starting IP address from 192.168.1.2 to 192.168.1.254; 2) the default gateway is 192.168.1.1 However, my switch default setting is like this: 1) IP address: 192.168.0.239, Subnet 255.255.255.0, default gateway is 192.168.0.1

    I notice the default gateway is different between the router and the switch. Does it matter to my problem?

    And I am reading the userguide you just recommended.

  • adam_liu_can Nov 06, 2010

    Hey Stelios, you are genuis, it is really the gateway problem. I think this switch is high tech stuff. So does the router. Their DHCP feature is conflicting with each other. What I have done is to reserver an IP for the switch box in the configuration of router. And reset the default gateway of the switch box into the default one of router. Now they can work together!!

  • adam_liu_can Nov 06, 2010

    Yes, Stelios, you are really helpful!

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Your problem is a very strange one. I suggest you to try connecting the computers one at a time in order to locate the computer that might comes the router to corrupt. I'm suspect of one of the computer's network card, although this kind of problem is not very often. This is just a way to start solving your problem. By the way, I assume that your LAN is not a "PoweredOverEthernet" one.

In case of a problem or clarification, don't hesitate to post me a reply before rejecting my answer.
If you are satisfied, accept my solution.

Thanks and regards
Stelios
direct fixya link: http://www.fixya.com/users/technical114

Posted on Nov 06, 2010

  • 3 more comments 
  • Stelios
    Stelios Nov 06, 2010

    The sequence for your connections is right. The "loopback problem" is a very old kind of problems that at the new lan switches has been solved (in few words it was a kind of setting or connection we used to do in order to use the switch as an intermediate device, this means that the signal flow will continue further than this device) and all of the new devices are "auto configured". Besides your system worked with a desktop and a laptop as you just mentioned. So I insist on plug in the computers one by one in order to locate the computer that brings the switch at reboot state. At the router panel every port that has an active connection at the other side has to a led to indicate the active state.

    In case of a problem or clarification, don't hesitate to post me a reply before rejecting my answer.
    If you are satisfied, accept my solution.

    Thanks and regards
    Stelios
    direct FixYa link:http://www.fixya.com/users/technical114

  • Stelios
    Stelios Nov 06, 2010

    Let's make some checks in order to clear up the things:
    Disconnect all the computers and the ethernet cable from the router from the switch. Turn it (power) on. Connect one computer at any port of the switch, except the first and the last ports. Wait to see the activation led for this port and the connection icon at the computer's taskbar. The computer will not get an internet access put has to get connected with the switch. Since this check works, try with the rest ports with the same computer, and after this with other computers. Check one step at a time in order to clarify which connection creates the problem. Post me back the results in order to go on.

    Waiting clarification, don't hesitate to post.

    Thanks and regards
    Stelios
    direct FixYa link:http://www.fixya.com/users/technical114

  • Stelios
    Stelios Nov 06, 2010

    SInce you have the router's DHCP server enabled, try to disable the DHCP server at the switch box (I thought that the DHCP server was already disabled at the switch box) or set it to relay the router's DHCP. I think that diasaling it is easier and less risky. Try and post me back.

    Waiting clarification, don't hesitate to post.

    Thanks and regards
    Stelios
    direct FixYa link:http://www.fixya.com/users/technical114

  • Stelios
    Stelios Nov 06, 2010

    Take a look at this official link.It's your Netgear switch user manual. At page 12 is described the procedure to set up the switch without DHCP server. Of course in case of any problem I'll be here to help you.

    In case of a problem or clarification, don't hesitate to post me a reply before rejecting my answer.
    If you are satisfied, accept my solution.

    Thanks and regards
    Stelios
    direct fixya link:http://www.fixya.com/users/technical114

  • Stelios
    Stelios Nov 06, 2010

    Your main problem is exactly at the gateway, this ip is the DHCP address. First of all narrow down the available ip range from the router (192.168.1.2 to 192.168.1.10). Go at the Netgear switch and change the ip address to 192.168.1.10, so that the switch will take the last ip from the router. Subnet 255.25.255.0 as you stay at the ip range 192.168.1.xxx. Default gateway 192.168.1.1.
    All the above ip settings are just an example, use these or create your own keeping the rules. Also the manual at the link I already provide is helpfull.

    In case of a problem or clarification, don't hesitate to post me a reply before rejecting my answer.
    If you are satisfied, accept my solution.

    Thanks and regards
    Stelios
    direct FixYa link:http://www.fixya.com/users/technical114

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Looks like you got a loop back on the network. An easy way to check for this is keep turning on 1 computer every 5 minutes to see which one gives the loop back and then check the connection for it..

YOu connection should be something like this..

1 from dsl modem to the switch.
from switch to each computer
from switch to wan on wireless router..

I'm sure your problem is a loop on the network eighter caused by the hookup or a bad network card.

as i suggested, turn on 1 computer and leave it on switching one another after 5 minutes,, the last one switched on when the problem occurs is the cause..

Posted on Nov 06, 2010

  • Rishi Roshan Ali Nov 06, 2010

    try modem to switch and switch to WAN in router port..

    The modem will assign Ip's to all devices connected to the switch and the the router'S WAN Ip,, then the router will assign all Ips to devices connected to it,, so try modem to switch and switch to router..

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