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The router in our dormitory is limited by property, so we can only use switches. I don't know how to crack it.

Connect the hub behind the router or switch.

Supplement: ADSL*** has two ways to surf the Internet, one is proxy and the other is address translation (NAT). The routing mode that people often say is actually NAT mode. In fact, the principles of routing and NAT are still different. I won't discuss it here. Nowadays, ADSL cats generally have the function of NAT, so it is more economical and convenient to surf the Internet with its own function. This paper mainly discusses this way.

If you want to block multiple computers from surfing the Internet, you must find out whether there are multiple computers behind you. The working principle of NAT is shown in figure 1. After NAT conversion, the addresses of computers accessing the external network are all changed to192.168.0.1,and the MAC addresses are also converted to the MAC addresses of ADSL, that is, in principle, they are directly at the ADSL exit. How did you find out? Through research, it is found that it uses a variety of methods to detect whether users use * * * to surf the Internet, thus restricting it. The following are cracked:

1. Check whether there are different MAC addresses in packets with the same IP address. If there are, judge that users like surfing the Internet. The solution is to change the MAC address of each computer to the same one. The modification method is as follows:

First, get the MAC of this machine: The MAC address is the physical address solidified in the serial EEPROM on the network card, which is generally 48 bits long. Ethernet switches exchange and send packets according to the MAC source address and MAC destination address in the packet header.

(1) in Windows 98/Me, click start → run → enter winipcfg"→ enter.

2 In Windows 2000/XP, click Start → Run → Enter CMD"→ Enter → Enter ipconfig /all"→ Enter.

Or right-click the local area connection icon, select the status and click the Support tab, where "Details" contains MAC and other important network parameters.

1. If your network card driver directly provides the function of cloning MAC address, such as RTL8 139 chip produced by RealTek, congratulations. Click Start → Settings → Control Panel, double-click Network and Dial-up Connection, right-click the icon of the network card whose MAC address needs to be modified, and select Properties. On the General tab, click the Configure button, and then click the Advanced tab. In the Properties area, you should see an item named Network Address or Locally Managed Address, click it, and enter the MAC address value you want to specify under Value on the right. To enter 12 numbers or letters continuously, do not enter "-"in the middle. The setting will take effect after the system is restarted once (Windows 98 and Windows 2000/XP have slightly different user operations, please refer to the system description).

2. If your network card driver does not provide the function of cloning MAC address, here are some ways to find one that suits you.

Under WIN98:

A. Right-click the Network Neighborhood icon and select Properties to open the Network dialog box. In the Configuration box, double-click the network card you want to modify to open the network card properties dialog box. In the "Advanced" option, click the "Network Address" item under the "Properties" label, select one of the two items on the right, and then enter the MAC address of the network card you want to modify in the box. After clicking OK, you will be prompted to restart. After restarting, your network card address will be successfully modified! !

B Click "Start → Run", type "winipcfg", select the network card to be modified, and record the MAC address value. Click "Start → Run", enter "regedit" to run the registry editor (the registry must be backed up before modification), and find "HKEY _ Local _ Machine System Current Control Settings Service Network" in turn according to the registry tree structure, and you will see something similar to "0000", "000 1" and "0002". Click from the subitem "0000" and look for the contents of the subitem "DriverDesc" in turn until we find the registration information of the network card exactly the same as the target we are looking for.

After finding the correct network card, click the drop-down menu Edit → New → String with the name "networkaddress". Double-click the newly created "Network Address" string name and enter a numerical value. Enter the new MAC address value you specified. The new MAC address should be a number or letter of 12 without "-",similar to "00c095ebc761".

There are two ways to activate a new MAC address:

If you use a normal built-in network card, you must restart your computer for the changes to take effect.

If you are using a PCMCIA card, you can perform the following steps without restarting the operating system: run winipcfg, select and release DHCP settings, and then close winipcfg. Open the control panel or the system tray "PCMCIA", stop and eject the PCMCIA network card. Reinsert the PCMCIA network card, open winipcfg, select and refresh DHCP settings, and run winipcfg to ensure that the modified MAC address has taken effect.

Under WIN2000:

A. Right-click the My Network Places icon on the desktop and select Properties. In the "Network and Dial-up Connections" window that appears, there are generally two icons, one is the "New Connection" icon and the other is the "My Connection" icon. If you have two network cards on your machine, there are three icons.

If you only have a network card, right-click the My Connection icon and select Properties to open the My Connection Properties window. At the top of the diagram, there is a sign "Use when connecting". This is the model of the network card on your machine. There is a "Configure" button below. Click this button to enter the network card properties dialog box. There are five property pages in this dialog box. Click the second "Advanced" page, and there are two items under the "Properties" label: one is "Link speed/duplex mode", which is to set the working speed of the network card. What we need to change is the following "network address". Click this item. There are two radio options under the "Value" logo on the right side of the dialog box, and the default value is "Does not exist". We just need to select the radio above, then enter the MAC address of the network card you want to change in the box on the right, and click OK. After a while, the network card address will be changed, and you don't even have to stop using the network card!

You can also open the property page of the network card in "Settings Manager" to modify it, and the effect is the same.

B. 1。 In the "HKEY _ Local _ Machine System Current Control Control Class 36E972-E325-11ce-bfc1-08002be10318.

ADSL*** enjoys surfing the Internet in two ways, one is proxy and the other is address translation (NAT). The routing mode that people often say is actually NAT mode. In fact, the principles of routing and NAT are still different. I won't discuss it here. Now ADSL cats generally have the function of NAT. It is more economical and convenient to enjoy the Internet with its own functions. This paper mainly discusses this way.