What do you mean by splitting?

While two LAN machines are using a 4 Mbit/s WAN link simultaniously, its bandwidth is automatically shared / divided among them. When the WAN has no load, it would not make sense to limit one LAN machine to 2 Mbit/s while we have 4 available - I don't see (yet) the problem you are trying to solve, sorry.

I mean i have 1 DIA Fiber optic line 4mbps speed. I want to separate it in to two different network but not connected to each other. WLAN 1 = 2mbps and WLAN 2 = 2mbps. what should i do?

I mean i have 1 DIA Fiber optic line 4mbps speed. I want to separate it in to two different network but not connected to each other. WLAN 1 = 2mbps and WLAN 2 = 2mbps. what should i do?

You could use the routing function of one or both Wifi Accesspoints so no network can communicate to the other.

You say 4 megabytes or megabits per second but usually when you have fiber, you will be getting mora than 200 megabits per seconds. 10 bits in that case = 1 byte.

It's quite unusual what you say.

In all humbleness, I would suggest that you look for a local IT guy to help you.

hi jhackers

in case you are using a wireless router and not an access point,
try this

connect each wireless router on the load balancer's LAN port
-each router should have different lan ip (e.g. 192.168.2.1 and 192.168.3.1)
and set each of the router's WAN connection to static IP
-WAN IP for each router can be 192.168.0.10 and 192.168.0.20 (assuming your router is 192.168.0.1

On the load balancer create users
user1 and user2

Create 2 groups
Group1 and Group2

Group1 member shoudd be user1 and Group2 member should be user2

On the bandwidth control, you can set 2Mbps for Group1 and Group2