It's summer, and my internet access is failing again (Possible DHCP, antenna hardware issue?)

MWW1987

Honorable
May 14, 2013
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10,510
Here is an image of what my network looks like:
jGAOBMc.jpg


Apparently, the signal between A and B is what is constantly going in and out. Which is apparently preventing the DHCP send/receiving info. So I have no access to the internet; but my connection says its OK (Signal low, 36+ Mbps) This problem only occurs during the hot summer months, between May - September. Last year, around September, we replaced the bridge because the previous one stopped functioning. After the replacement, access to the internet was not a problem. It is an EnGenius ECB3500. From the bridge, it connects to a Netgear DS108 8-port hub, to a Linksys WRT54g wireless router that is at least 5 years old. Through the hub are 3 Cat5 cables that go to the southern house (white roof), the east bedroom on the main house (B). The other office (C), is perfectly fine. They have no issues at all. When the connection works at B, I get no Event 1003/Event 1000. When connected by wire, it still comes up with the DHCP issue and I have no access to the internet still.

The antennas between A and B are about 500 meters away, which is fine for 2.4GHz, 12dBi Yagi antenna, I guess? They are nearly level with each other, +/- 5 ft elevation. There is a direct line-of-sight, with one tree barely in the way, as you can see in the image. Antenna B sits just below the eave of the garage, about 20 feet up. While Antenna A is mounted on the roof, about 20 feet also.

I'm told that it's because of the heat, and that we need to boost the signal by putting another antenna with an amplifier between point A and B. But I'm also told that the heat has nothing to do with signal loss - but over time it can damage hardware.

Any help is appreciated. I've been trying to wrap my head around this problem in the first place for months. Please, someone point me in the right direction before I go buying $200+ in equipment.

Here is the event:


Event Type: Warning
Event Source: Dhcp
Event Category: None
Event ID: 1003
Date: 5/14/2013
Time: 2:56:25 PM
User: N/A
Computer: SPECIAL-XXD2XXX
Description:
Your computer was not able to renew its address from the network (from the DHCP Server) for the Network Card with network address 00XXXX1XXXX0. The following error occurred:
The semaphore timeout period has expired. . Your computer will continue to try and obtain an address on its own from the network address (DHCP) server.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 79 00 00 00 y...
 


Are you suggesting that the router and hub are redundant, and that they should be replaced by the ENS202EXT AP?

I feel like there is a redundancy somewhere, anyway. I just don't know where to start, as far as isolating the problem.

My goal is to first isolate the problem, and try to repair/replace. If that does not resolve it, then I will go ahead with getting the amplifier and upgraded antennas.

 
The main relevant piece of info:
This problem only occurs during the hot summer months, between May - September.

This is when the trees have leaves (assuming you live in the northern hemisphere). 500 meters is already a stretch. Add leaves (moisture and mass) and the signal dropping is not unexpected.
 


So despite the clear (visually) line-of-sight, those leaves are, as an analogy, bottle-necking the signal? Funny how the most obvious isn't actually that obvious - and I just read that moisture and 2.4Ghz don't get along. We do have power about halfway between A and B, and close to C (maybe C could even be the repeaters location). Does it matter if the repeater is PoE?

I'm also in the process of seeing how to upgrade the firmware of the EnGenius Bridge, and also major correction: the WRT54g router is not a router, its an Access Point. (Linksys model: WAP55AG) I have been eager to replace the AP (which I thought was a router) anyway. What to do about the hub, though?

Thank you all for the help, I'll leave this thread open until I no longer see the DHCP issue/internet access failure.
 
So despite the clear (visually) line-of-sight, those leaves are, as an analogy, bottle-necking the signal?

Yes, that is exactly what I think is happening.
Over more than one summer/winter iteration, it works, but not in the summertime. Looking at that overhead image, there are trees. So that would seem to be the conflicting factor.

Funny how the most obvious isn't actually that obvious - and I just read that moisture and 2.4Ghz don't get along.

Sometimes another set of eyes on the issue can quickly ID the problem.

If you had a perfectly good short range WiFi signal, and put a fish tank in between the PC and the router...you'd have a crappy signal.
This is the concept that microwave ovens operate on. Moisture (water) absorbs the 2.4Ghz band.