Technically, the limit would be the number of IP addresses the router can lease. In a class C network, the limit would be 254 devices.
i dont think i did the setup of my router right.... cause i bought a Encore N adapter, and its recieve a much lower speed than the built-in b/g adapter... i think its only 38mbps and a low-to very low signal strength... okay.. need to reconfigure i think with the other comp, cause the other older laptop is A-ok... receiving a 104-130 mbps range and a low to good signal. is it the fault of the adapter or the fault of the router? okay, the problem now is the range... still can receive at the farthest area...
1. Keep the number of walls and ceilings between the D-Link router and other network devices to a minimum - each wall or ceiling can reduce your adapter’s range from 3-90 feet (1-30 meters.) Position your devices so that the number of walls or ceilings is minimized. 2. Be aware of the direct line between network devices. A wall that is 1.5 feet thick (.5 meters), at a 45-degree angle appears to be almost 3 feet (1 meter) thick. At a 2-degree angle it looks over 42 feet (14 meters) thick! Position devices so that the signal will travel straight through a wall or ceiling (instead of at an angle) for better reception. 3. Building Materials make a difference. A solid metal door or aluminum studs may have a negative effect on range. Try to position access points, wireless routers, and computers sothat the signal passes through drywall or open doorways. Materials and objects such as glass, steel, metal, walls with insulation, water (ï¬sh tanks), mirrors, ï¬le cabinets, brick, and concrete will degrade your wireless signal. 4. Keep your product away (at least 3-6 feet or 1-2 meters) from electrical devices or appliances that generate RF noise. 5. If you are using 2.4GHz cordless phones or X-10 (wireless products such as ceiling fans,lights, and home security systems), your wireless connection may degrade dramatically or drop completely. Make sure your 2.4GHz phone base is as far away from your wireless devices as possible. The base transmits a signal even if the phone in not in use. What type of house did they tested these devices at? a house made of pure wood? and not just any wood but a plywood, mostly less than a thick inch? and no glass windows or bricks, concrete or metal in construction?
if they're configured right, yes. You would have to disable DHCP on the two downstream routers so only the border device (the modem) issues IP addresses. Unless you want wireless, I'd suggest using switches instead of routers. If you do want wireless I would personally do switches and access points, but depending on the routers, it could work that way.