i need help to resolve this problem..

[ondion]

Hi...frends,
What I have:
->Internet Gateway: He is used by the users from our LAN.DHCP asign IP to everyone in according to his MAC address.
->Trafic shaper: He is responsable for the bandwidth distribution to every user. Every user have certain internet traffic.

*My DHCP server give's IP to everyone in the lan and everting is ok,but the problem comes when someone changes his IP to another and evetually can get internet connection that don't belong to him but to another user(when he is not pluged in),so i have to prevent this!

*I need to configure my router to provide internet access to users with
exact mac and ip address(mac and ip must be locked together so that it become impossible to change the IP.),and to disable such users that changes their IP.

[aioshin]

since you have your dhcp working properly, try to reconfigure it by specifying a fixed ip address to a particular mac address. below is my dhcp configuration, but I'd used it for my LTSP diskless client, though it is still a dhcp config. Just to give you an idea how it happened

ddns-update-style none;
default-lease-time 21600;
max-lease-time 21600;

option subnet-mask 255.255.255.0;
option broadcast-address 172.16.0.255;
option routers 172.16.0.1;
#option domain-name-servers 2xx.xx.xx.xx;
option domain-name "mydomain.com.";
option root-path "172.16.0.29:/opt/ltsp/i386";

option option-128 code 128 = string;
option option-129 code 129 = text;

shared-network WORKSTATIONS {
subnet 172.16.0.0 netmask 255.255.255.0 {
}
}

group {
use-host-decl-names on;
option log-servers 172.16.0.254;

host ws001 {
hardware ethernet 00:0h:o5:B3:51:02;
fixed-address 172.16.0.50;
filename "/tftpboot/lts/2.4.26-ltsp-2/pxelinux.0";
## option option-128 e4:45:74:68:00:00;
## option option-129 "NIC=eepro100";
}
host ws030 {
hardware ethernet 09:30:18:16:5x:62;
fixed-address 172.16.0.30;
filename "/tftpboot/lts/2.4.26-ltsp-2/pxelinux.0";
## option option-128 e4:45:74:68:00:00;
## option option-129 "NIC=tulip";
}
}

~