MAC or Media Access Control is the other name for Ethernet Card Address. Ethernet was originally developed by Xerox then further developed by Xerox-DEC-Intel. Before the name was Alohanet. The name was taken from Palo Alto Research Center Aloha Network.
Ethernet was named by Robert Metcalfe. Maybe, Ethernet means carry data everywhere throughout the network.
MAC address is the true name for a computer in a LAN. It’s usually expressed with 12 digits hexadecimal number. (Example: 00:0d:88:b3:72:f3)
When you are connected to a LAN, your IP number will be translated to MAC address by a protocol called ARP (Address Resolution Protocol).
Let’s say, you use computer A with IP 192.168.0.2.
Computer B has an IP 192.168.0.3.
When you send a package to computer B, there are few steps run behind the scene. But these steps are based on LAN configurations. I’m sure that almost all LAN use star topology now.
The first generation of star topology use HUB to connect the all computers. Now, we use SWITCH.
Using HUB
When computer A (192.168.0.2) sends a package to computer B (192.168.0.3), first it will send a broadcast message to all computers in that LAN. Same like, when send a package to Alan, in front of the door, you scream, ‘Hey, who is ALAN?’. If Alan is there, he will say, ‘I’m Alan’ then you deliver the package to him.
Using SWITCH
When computer A (192.168.0.2) sends a package to computer B (192.168.0.3), it will send directly to computer B. Because Switch has everybody’s MAC address in its memory. So, you don’t have to scream.
What is the purpose MAC address for Administrator?
If you read my article about DHCP server,
https://taufanlubis.wordpress.com/2007/10/14/dhcp-server/
…..
…..
lease 192.168.0.199 {
starts 5 2007/10/05 22:37:02;
ends 5 2007/10/05 23:37:02;
tstp 5 2007/10/05 23:37:02;
binding state free;
hardware ethernet 00:0d:88:b3:72:f3;
}
….
….
You see that IP 192.168.0.199 is only used for MAC 00:0d:88:b3:72:f3. Mean, it won’t work if somebody try to use this IP address with another PC. Off course it’s very easy to hack because in Linux you can change your MAC address easily. If you know, :).
taufanlubis@toshiba:~$ ifconfig | grep Ethernet
eth0 Link encap:Ethernet HWaddr 00:A0:XX:XX:XX:XX
eth1 Link encap:Ethernet HWaddr 00:1B:XX:XX:XX:XX
eth0:avah Link encap:Ethernet HWaddr 00:A0:XX:XX:XX:XX
taufanlubis@toshiba:~$
Kalo postingan ini bisa baca, tapi knapa yg VariCAD2007 ga bisa ya. Oh iya ….. lam kenal.
i am using windows xp plz how can i change the mac adress of my network card plz reply me now
I don’t use win* anymore, but you can find the solution from the link below:
http://www.nthelp.com/NT6/change_mac_w2k.htm
hi guy i dont if that will help, if so am happy. if you need more help:my email you can write.
virus.v@live.com
This is depending on the type of Network Interface Card (NIC) you have. If you have a card that doesn’t support Clone MAC address, then you have to go to second method.
1.
Go to Start->Settings->Control Panel and double click on Network and Dial-up Connections.
2.
Right click on the NIC you want to change the MAC address and click on properties.
3.
Under “General” tab, click on the “Configure” button
4.
Click on “Advanced” tab
5.
Under “Property section”, you should see an item called “Network Address” or “Locally Administered Address”, click on it.
6.
On the right side, under “Value”, type in the New MAC address you want to assign to your NIC. Usually this value is entered without the “-“ between the MAC address numbers.
7.
Goto command prompt and type in “ipconfig /all” or “net config rdr” to verify the changes. If the changes are not materialized, then use the second method.
8.
If successful, reboot your systems.
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