how to connect 6 d-link dwl2100ap together

If you use periods at the end of sentences, I think your posts will be much easier to understand. I don't understand how you have counted 6 WLANs. Do you mean 6 APs?

Also, this statement would seem to be contradicting itself:

We really need more information as you haven't been very specific as to how everything is connected. Is there ethernet run from the mast to the rest of the nonwireless network? What is the router connected to? In general you should not be using three APs at the central site, it would be better to use a single AP in point to multipoint mode there and use bridges for the two cameras.

One AP at the mast, one at each camera, one at the office. The one on the mast will be point to multipoint, all others will be point to point. No need for the router or other two APs.

That's not the best way to go about it. I would have used an omni at the center and directional antennas for the cameras and office. Reason being, three APs that close to each other are probably going to interfere with each other fairly substantially. Luckily you have three channels to use, but even on different channels it's my opinion that it is still not a great idea to locate multiple radios so close together.

So in your current setup how have you ascertained that each link is working? Can you provide your IP addressing scheme?

Thank you for your help, I got the system to work, The problem was one of the units had a faulty LAN port, all sorted now

Regards

John Donnelly