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Keeps losing routers

Posted on 2010-11-11
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Last Modified: 2012-05-10
I have a house that I am working on.   They have Cat 5E to 4 locations in the house.   The setup is to have 3 of the locations set up to hard wire and the fourth is a Netgear "N" wireless switch so the two rooms right near the wireless switch is wireless.  I turned off the broadcast of the wireless router so that the only one showing would be the Netgear wireless switch.  The house walls are made of cinder block so wireless doesn't go far.   The first Linksys router (new one) "N" band 4 port, stopped working.   I called Linksys and they said to bring it back to where it was purchased.   I put another Linksys "N" router in and the setup worked great the first day.   The second sday again it stopped working and the user says he had to take the router out to get one location to work right off the Cable modem.  Attached is a copy of the diagnostics the user ran when he could not get the internet on the 4 locations the 2nd day.   Any idea what is happening?   It seems like routers are getting fried at this location.
Again it is cable coming into the house to the cable modem, then from the cable modem to the Linksys router, then out to the four locations, one being to the Netgear wireless switch. Linksys-issue.pdf
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Question by:syssolut
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giltjr earned 500 total points
ID: 34120157
The diagnostics don't really say a lot.  Their computer was forwarding DNS lookups to 192.168.1.1, which I am assuming is the Linksys router.

What needs to be done is to look at the Linksys router when the problem is occuring and if possible the cable modem.

It appears that you may have multiple gateway/router devices.  First thing is to make sure that only ONE of them is acting as a DHCP server.  Preferably the one that has direct Internet connection.  

If you have multiple DHCP servers, then you will get weird results.
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by:syssolut
ID: 34120431
But my understanding is that the cable modem has one IP to give out.   Then it hooks into the "internet" port of the Linksys router.   Then the router hands out the IPs being the DHCP server.   The Netgear switch wouldn't do that,   Isn't this a correct assumption?
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by:giltjr
ID: 34120953
Well not really, the problem I think you have is that you are calling the Linksys and Netgear "N" devices switches, when in fact they are most likley routers and by default they also are seutp to do DHCP serving.

So you need to verify that DHCP serving on the wireless access points have been disabled.

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by:syssolut
ID: 34132570
I actually purchased them.   the Linksys is a 4 port "N" wireless router and the  Netgeat is a wireless  port switch.   It said in the wireless switch setup  directions that you should save the IP addresss in the router as a static IP so that it will not re-assign the switch a new IP adddress.
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by:syssolut
ID: 34132600
It said in the setup directions said to save the wireless Switch IP address in the router settings.
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by:giltjr
ID: 34133415
Can you draw a stick diagram of the setup?  Something like:

PC <-- Wired --> Swtch <-- Cable Modem -->
                              /\
                              |
                             \/
                   Wireless Router
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by:syssolut
ID: 34133731


Cable into House - - Cable Modem  --  Linksys Wireless 4 POrt Router

                                                                    I              I              i              i
                                                            Wired Port      I      Wired Port      I
                                                                                   I                             I
                                                                         Wired Port                 Wired Port
                                                                                                                  I
                                                                                                       Netgear Wireless Switch


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by:giltjr
ID: 34135652

O.K.  So it is the Linksys Wireless device that all of a sudden stops working?

Can the customer get into the management page?

Are the lights on?  If so which ones?

Can the PC's that are connected to the wired ports communicate with each other?
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by:giltjr
ID: 34135678
Also which model Linksys and Netgear do you have?
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by:syssolut
ID: 34137151
It is a WRT120N Linksys Router and a WN802T Netgear access point.   As for the lights, I will be seeing the customer this week.  
The customer only has one computer on at a time.   I will see if they can talk to each other, but I do not believe they can.
Yes I believe the management page is accessible
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by:giltjr
ID: 34139316
Well hopefully you can see everything when it is "broke".

I would check setup/admin pages on the Linksys to see what it looks like.  I doubt if two routers would get fried and nothing else, unless the Linksys routers were on a different circuit that all other computer devices and that circuit is bad.
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by:syssolut
ID: 34157808
The user rebooted all units,...the user said two wireless computers worked and two wired worked.   The user shut everythin0g down for the night and the next day he had the same issue.   What would cause this to happen?    Why doesn't the router pass out the IPs to all the nodes after it has been restarted?
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by:syssolut
ID: 34157838
The user rebooted all units,...the user said two wireless computers worked and two wired worked.   The user shut everythin0g down for the night and the next day he had the same issue.   What would cause this to happen?    Why doesn't the router pass out the IPs to all the nodes after it has been restarted?
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by:giltjr
ID: 34158086
Without being there or talking directly to the user it is hard to tell.

If everything was powered up at the same time, it is possible that the computer were attempting to get addresses prior to the Linksys router being fully up.  I am assuming that the Linksys router is the DHCP server.

If they want to power everything down each night, then they should power the Linksys router (assuming that is their DHCP server) first, wait until it appears to be fully up (which may take 3-4 minutes), power up the Netgear WAP next , wait until it seems to be fully up (another 3-4 minutes), then start powering the computers up.

Do you know for a fact that the computers did not have any IP addresses?  Did he do:

     ipconfig /all

on each of the computers?
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by:syssolut
ID: 34173956
Hi giltjr.   I think we narrowed the issue down to one thing.   Either the cable has a blip in it at night or the electricity to the modem has a blip.   This only happens at night time and when you reboot everything, it runs perfect for the whole day.
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by:giltjr
ID: 34174030
I would still have him issue the ipconfig /all command when there is a problem.

Does he have everything on surge protectors?
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by:syssolut
ID: 34271661
I am going to get back with customer in the next few days.   Sorry for delay
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by:kallatech
ID: 34605995
The WRT120N is a lemon.

Read the reviews on new egg and the web. It randomly disconnects.


I tried setting one up for a customer last night and had connectivity both wired and wireless but then lost wired and wireless connectivity. This was prior to finding out the reviews on this device and I did not recommend this device to my customer.
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by:syssolut
ID: 34606115
Well I just talked to the customer about this.   After all this time, Cisco/Linksys just came out with an update to the firmware that corrects the whole issue.  

The customer went on a blog and found hundreds of people with the same issue and someone finally pointing them to this updated firmware.  
So my customer tried it, downloaded the firmware and it works all the time now.  So for a product I was very much promoting it left me looking not so good.  

Any way, thanks for all the suggestions.

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