hi
i want to know how to bind IP address with MAC address in linux...
if there is a script then plz share with me..
thanx

ifconfig eth0 down
ifconfig eth0 hw ether 12:34:56:78:91:01
ifconfig eth0 up

You bind MAC's to hardware, not IP schemes.

The Media Access Control (MAC) sublayer is the part of the OSI network model data link layer that determines who is allowed to access the physical media at any one time. It acts as an interface between the Logical Link Control sublayer and the network's physical layer.

The MAC sublayer is primarily concerned with the control of access to the physical transmission medium (i.e. which of the stations attached to the wire or frequency range has the right to transmit?) or low-level media-sharing protocols like CSMA/CD.

actualy i want that the user may have access to inernet (get an IP) only if his MAC address is in my database. and is the user changes his LAN card he doesnt get any IP with his new NIC untill unless he comes to me and provide his new MAC address.

That's nice.

Ddns-update-style interim;
ignore client-updates;

subnet 10.69.0.0 netmask 255.255.0.0 {

# --- default gateway
option routers 10.69.5.1;
option subnet-mask 255.255.0.0;

# option nis-domain "domain.org";
# option domain-name "domain.org";
option domain-name-servers 10.69.5.1;

option time-offset -18000; # Eastern Standard Time
# option ntp-servers 192.168.1.1;
# option netbios-name-servers 192.168.1.1;
# --- Selects point-to-point node (default is hybrid). Don't change this unless
# -- you understand Netbios very well
# option netbios-node-type 2;

# range dynamic-bootp 10.69.6.100 10.69.6.200;
default-lease-time 21600;
max-lease-time 43200;

# we want the nameserver to appear at a fixed address
host www

# next-server marvin.redhat.com;
{
hardware ethernet 00:15:60:bb:9f:ea;
fixed-address 10.69.8.x;
}
host Mr YYY
{ hardware ethernet 00:c0:9f:9d:8b:bd;
fixed-address 10.69.8.x;
}
host Mr-XXX
{ hardware ethernet 00:15:60:bb:af:09;
fixed-address 10.69.8.x;
}
}

i think this script is for DHCP server.