(How do I) How To Limit Bandwidth of User conectivity LAN ?
 

I will install CentOS 5 (it can be other linux/UNIX system OS too) on a rack server that has multiple network interfaces (4 x network interfaces). I have a ISP on eth0 for example. How do I share the bandwidth and how do I limit the internet bandwidth on the other interfaces (eth1, eth2)?

EG:

I will have ISP on eth0 and I would like to share (NAT) the bandwidth of the eth0 on eth1 and eth2 and would like to limit the bandwith on the eth1 and eth2. How do I do that ? What program(s) should I use ? I want to be able to limit the ISP bandwith not on eth1, but on IP, for EG I want 192.168.1.1 to have 5mbps and 192.168.1.2 to have 2 mbps and so on.

It is ok if you guys give me a program that use the limit in three ways too (fast, medium, slow) no problem, but pls give me a method on how to limit bandwith from the isp to the final users.

There will be eth1 and eth2 NAT users and eth0 ISP and I will have eth1 with 254 IP's and eth2 with 254 IP's too. I have over 500 clients and I need (I think) two different eth to be able to share the IPS internet connection with them (over 500 clients).

Ok, i've found IPCop and BrazilFW so far. These looks good and they are faire enough, I think, but... is there any other pro utility / programs ?

If you simply want to limit bandwith usage on one NIC (network interface, like eth0, eth1, wlan0 ...), wondershaper is a suitable command-line tool (note that it uses kilobit/sec, so if you're used to kilobytes/sec, just multiply the number by 8).

Mate, read carefully. I said I want to limit the bandwith on IP not on eth.