Low voltage + wireless router = ridiculous latency?

EULA

Senior member
Aug 13, 2004
940
0
0
I live in a large house with several other individuals, and I'm installing, and will be managing a wired and wireless network. I'm running into a bit of a conundrum. Occasionally, traffic to and from the internet will be delayed up to 1500ms, or rarely, dropped. At first I thought it was the cable modem, until I had it replaced. Then I thought it was the wireless router, until I tried several different ones. Out of curiousity, I tested the voltage in the house, and was only getting about 107 volts. I plugged in a UPS and hooked up the cable modem to it and all was fine until the UPS took a dump. Instead of purchasing a new UPS, I picked up a voltage regulator and connected the cable modem to that. It worked for a good while.

Now I'm encountering the same problem. I've noticed that if I power-down the wireless router, and start it up again, everything's fine for a minute or so, and then pings to the outside world start rapidly increasing. I'd like to think it's the voltage to the router, but if that were the case, you'd think that a ping to any other machine connected to it would also have similar latency, but this is not the case.

I'm considering the possibility that the voltage regulator is just not adequate, because if I reset the router, everything is good for a short while, and sometimes after resetting, everything is good for a long while.

The only other possible problem that I can think of would be in a line I ran from the cable modem, to the wireless router - I used UTP and ran it through the basement. I'm wondering if I'm picking up interference somewhere on that line. If this were the case though, I'd think it would happen more often; It usually only happens late in the evening/early morning, when I'm the only one on/awake. I think I may try running another line, or using shielded cable to see if thats possibly the problem.

Other than that, I'm out of guesses. Has anyone else experienced any sort of similar problem?
 

Talcite

Senior member
Apr 18, 2006
629
0
0
107 volts isn't actually that bad... Most houses have 110 or 120. I think you're overanalyzing this problem here. Have you considered the computer the problem or perhaps one of the other people in the house causing the problem? I've never heard of low voltage causing problems with a router or modem before. Especially if it's so close to the 110. If you really want to try... why not artificially decrease the voltage to your router and see if the problem occurs more often, then correct it and see if it goes away completely.
 

EULA

Senior member
Aug 13, 2004
940
0
0
I'm positive its not the computer, because it happens to any computer connected to the network.

I temporarily ran another line to see if it was interference, but I still had the same problem.

I also removed the wireless router from the equation and hooked the cable modem directly to my computer and had no problems whatsoever, but I find it hard to believe that three routers, one a different brand, would all have the exact same problem.

I suppose its also possible that someone's computer is infected with some sort of virus that is flooding the network... I have some more diagnostics to do.
 

spidey07

No Lifer
Aug 4, 2000
65,469
5
76
run ethereal on one of the problem computers and see if you're getting some kind of broadcast/packet storm.
 

ScottMac

Moderator<br>Networking<br>Elite member
Mar 19, 2001
5,471
2
0
Well, if you had the wireless on the client up at the same time you were "wired" to the same router on the same system, you'd have a loop which would cause a broadcast storm.

As Spidy suggests, catch a trace from the computer side and it should reveal a lot.


Good Luck

Scott
 

EULA

Senior member
Aug 13, 2004
940
0
0
Ran ethereal, and sure enough, another router was broadcasting all sorts of useless garbage. Removed the router, and everything seems to be working fine.
 

EULA

Senior member
Aug 13, 2004
940
0
0
Just another update:

The problem returned shortly after;


Turns out that it must be someone's laptop that is selling penis enlargement pills to the world, because If I disable wireless on the router, everything drops to normal, but a few minutes after enabling it, it starts up again.

Time to enforce a mandatory spyware/virus cleaning.
 

nweaver

Diamond Member
Jan 21, 2001
6,813
1
0
running ntop between your router and modem (passive, no IP, second NIC with IP in router) can find problems like this. You need to get a passive network tap, switch with monitor capability, or an old school hub to do the sniffing.
 

ASK THE COMMUNITY