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A very strange phenomenon.

Discussion in 'Networking Issues' started by hyiu00, Jul 8, 2007.

  1. hyiu00

    hyiu00 Network Guru Member

    I have established a wireless link between two houses for about two years already. The wireless link is between a WRT54G router and a WAP54G access point. But the strange situation is that about every few months, the link will go bad, such that if I ping from one side to the other side, I can only get less than 5% ping success. I tried power down/up either side and no used. But when I use 'site survey' from the access point to view the router power level, it still seems as good as normal. The only way to re-establish connection is by changing wireless channel. It seems that they need to 're-sync' the channels every few months.
     
  2. ifican

    ifican Network Guru Member

    These are always very tough, wireless is very susceptable to outside influence, i.e. Stray signals, magnetic flux or power coupling. The good thing is you have discovered an easy fix, the bad news is, it can be quite hard to figure out what is causing it. An easy one to put the thought process in your head is phones or micro waves, they can and do depending on your setup interfere with your wireless. Well on a much larger scale, power transformers, street lights going bad, large overhead power lines etc can and do cause interference as well. Theres no need to go into more detail but know that sometimes to figure out whats going on you have to think outside the box.
     
  3. hyiu00

    hyiu00 Network Guru Member

    ifican,

    Thanks for your reply. One thing I should try is change the channel to a different one and then change back to the original channel to see what happen. But this only happens in a few months, so I do not have a chance to try it until end of the year I guess. I read in some RF forum that even the Earth magnetic pole shifting need to be taken into account when doing RF calculation, so it much be quite involved to know the detail.
     
  4. ifican

    ifican Network Guru Member

    Magnetic shift should not cause anyone of us using wireless any issue unless you are sitting on one of the poles. But as i was saying there are so many things that can and do affect wireless that its tough. It you live in a heavily populated area (condo or apartments) it could easily be something one of your neighbors is doing.
     
  5. hyiu00

    hyiu00 Network Guru Member

    Finally I got a chance to try yesterday when the connection went bad again. I changed the WRT54G channel from 10 to 9, and the connection became good again. The WAP54G side did not need to make any change. It seems the WAP54G will automatically adjust itself to follow the channel change of the WRT54G. But when I moved the WRT54G back to channel 10 again, it failed and the device just locked-up (I cannot even access the 192.168.1.1 page from the WRT54G side). This kind of failure seems coming more often these days, so I think the WRT54G must be aging, since I put it in a box which could get quite hot under the sun.
     
  6. hyiu00

    hyiu00 Network Guru Member

    The last time I put this post, I upgraded the firmware of both WRT54G and WAP54G, and up to now, the connection seems very stable. So it could just be as simple as firmware problem. The reason I was reluctant to update firmware was because I had HyperWAP and HyperWRT installed to boost the power, and I was afraid to loose the power boost when I upgrade the firmware. But now, even without the 'Hyper' power boost on each side, I can get a quite good connection. The two antennas are pointing at each other using homemade parabolic antenna in 100m line-of-site. Will see one more month to confirm if the problem is fixed.
     
  7. hyiu00

    hyiu00 Network Guru Member

    After two months of stable operation, it happened again today and I have to change channel again to fix the problem. These few times of this connection issue seems to happen always on Saturday or Sunday, so it does seems someone is playing around on these frequencies.
     
  8. jon124

    jon124 LI Guru Member

    run on the highest channel you can
     

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