There are two ways for ADSL to share the Internet. One is proxy and the other is address translation (NAT). Generally, the routing method is actually Nat, in fact, the principle of routing and Nat is still different. We will not discuss it here. Currently, ADSL cats generally have Nat functions. It is more economical and convenient to use its own functions to achieve Internet sharing, this article mainly discusses this method.
If you want to block more than one computer from accessing the internet, you must find that there are more than one machine behind the sharing, as shown in Nat working principle 1, after Nat translation, the addresses of computers accessing the Internet over the Intranet are changed to 192.16 8.0.1, And the MAC address is also converted to the MAC address of ADSL. That is to say, in principle, you cannot find several machines accessing the internet by directly capturing nat-converted packets at the ADSL egress. How did we find it? After research, it is found that it uses a variety of methods to detect whether users use the Internet sharing mode, thus limiting, the following are cracked:
1. check whether there are different MAC addresses in the packets with the same IP address. If so, determine that the user shares the internet. The solution is to change the MAC address of each server to the same one. The modification method is as follows:
First, obtain the MAC address of the Local Machine: the MAC address is the physical address that is fixed in the serial EEPROM on the NIC, usually with 48-bit length. The ethernet switch implements packet switching and Transmission Based on the Mac source address and Mac destination address in a packet header.
(1) In Windows 98/Me, choose Start> RUN> enter winipcfg> enter.
(2) in Windows 2000/XP, click Start → run → Enter cmd → press ENTER → enter ipconfig/All → press Enter.
Alternatively, right-click the local connection icon, select the status, and click the support tab. "details" contains Mac and other important network parameters.
1. If your NIC Driver directly provides the clone MAC address function, such as the rtl8139 chip from RealTek, congratulations. Click Start → set → control panel ", double-click "network and dial-up connections", right-click the NIC icon to modify the MAC address, and select "properties ". On the "General" tab, click the "configuration" button and click the "advanced" tab. In the "attribute" area, you should see a project called "network address" or "locally administered address", click it, and under the "value" on the right, enter the MAC address value you want to specify. You must enter 12 numbers or letters consecutively. Do not enter "-". After the system is restarted, the setting will take effect (Windows 98 and Windows 2000/XP user operations are slightly different, please refer to the System Instructions)
2. If your NIC driver does not provide the clone MAC address function, here are some methods to find a suitable one for you.
Win98:
A. right-click the "Network Neighbor" icon and select "properties". A "network" dialog box is displayed. In the "configuration" box, double-click the NIC you want to modify and a NIC attribute dialog box is displayed. In the "advanced" option, click "network address" under the "attribute" identifier, and select the preceding one from the two single options on the right, enter the MAC address of the network adapter you want to modify in the box, and click "OK", the system will prompt you to restart. After restarting, your NIC address will be modified !!
B. Click "Start> Run", type "winipcfg", select the NIC you want to modify, and record the MAC address value. Click "Start> Run", enter "Regedit" to run the Registry Editor (you must back up the registry before modifying the Registry), and locate "hkey_local_machinesystemcurrentcontrolsetservicesclassnet" in sequence based on the registry tree structure ", you will see subkeys like "0000", "0001", and "0002. Click the "0000" sub-key and search for the content of the "driverdesc" key under the sub-key until you find the NIC registry information that is exactly the same as the target.
Describe the best method to crack China Telecom's route-prohibited Internet access (2)
After finding the correct Nic, click "Edit> New> string" in the drop-down menu, and the name of the string is "networkaddress". Double-click the name of the newly created "networkaddress" string, you can enter a value. Enter the new MAC address value you specified. The new MAC address should be a 12-digit number or letter with no "-", similar to "00c095ecb761.
There are two ways to activate a new MAC address:
If you are using a common built-in Nic, you must restart the computer to make the change take effect.
If you are using a PCMCIA card, follow these steps without restarting the operating system: Run winipcfg, select and release DHCP settings, and disable winipcfg. Open the control panel or System Tray "PC Card (PCMCIA)", stop and bring up the pcmcia Nic. Re-insert the pcmcia Nic, open winipcfg, select and refresh DHCP settings, run winipcfg, and confirm that the modified MAC address has taken effect.
In Win2000:
A. right-click the "Network neighbors" icon on the desktop and select "properties". In the "Network and dial-up connections" window, there are usually two icons. One is the "New Connection" icon, one is the "my connections" icon. If your machine has two NICs, there will be three icons.
B. if you only have one Nic, right-click the "my connections" icon and select "properties". A "My Connection Properties" window is displayed. In the upper part of the graph port, there is a "Connect with:" icon. The following figure shows the NIC model on your machine. There is a "configuration" button below. Click this button to enter the NIC Properties dialog box. This dialog box contains five properties pages. Click the second "advanced" page, there are two items under the "attribute" identifier: one is "link speed/duplex mode", which is used to set the NIC working rate. We need to change the following "network address ", click this item. There are two single options under the "value" icon on the right of the dialog box. The default value is "no". We only need to select the single option above, enter the MAC address of the network card you want to change in the box on the right, and click "OK". Wait a moment, the network card address will be changed. You don't even need to disable the network card!
You can also open the NIC properties page in "Settings manager" to modify the settings.
Many broadband providers have set the MAC address binding function for users to restrict users from accessing the Internet through sharing multiple computers at the same time. Since the MAC address of each network card is fixed, after the address is bound, the relationship between the IP address and the computer or user is fixed, that is, only a specific host can use a specific IP address to connect to the Internet.
However, in many cases, we need to make all or some computers in a LAN share the Internet over one line. Generally, we need to set up a proxy server on the computer bound to the MAC address, all computers access the Internet through this proxy server. In this case, it is inconvenient to have a computer that is always in the starting state as a server. Next, I will introduce how to use the "MAC address clone" function of the Broadband Router to break through the address binding of the broadband provider and achieve Internet sharing among multiple computers.
Take the author's TP-link TL-R402m small router as an example. Go to the Web Settings page of The vro from the computer with the bound MAC address, and select "Initial Settings" under "Basic settings" in the main menu ", click "modify" in the "wan interface type" column, and then select "Dynamic IP ".
After saving, return to the "Initial Settings" Page. There is a text box after the option in the "Wan MAC address" column, where the content is the MAC address of the local machine, you can modify the MAC address in the text box and enter the MAC address of the bound Nic. If you do not know the MAC address of the NIC, you can select the clone Mac button to clone the MAC address of the NIC of the current computer to the WAN port of the TL-R400 +. Save and restart the vro.
Note: You must select "Dynamic IP" in the "wan interface type". Otherwise, the option of modifying the MAC address and cloning MAC address of the WAN interface will not appear. If you are using other access methods, such as static IP addresses and pppoe, you can re-enter the configuration page to modify the WAN type after completing the preceding settings.
