It is possible for my computer to connect directly to the wall connector, but it is not possible to

1. Has your computer been touched recently? In particular, have the ADSL modem wiring and lines been moved? Please check whether the signal light on the "cat" will flash (the cat is different, the indicator light is also different, mainly dsl, adsl, line, link, @等都是宽带信号指示灯), if you want to flash, check whether the line is connected to the pair (mainly on the separator, there are three ports, each port corresponds to a line, the connection method is the bus is the incoming line port, ** machine connected to the phone port, in addition to modem or adsl connected to the broadband cat, you can also directly connect the ** incoming line on the cat to try, This can rule out the bad separator), if the connection is still flashing, check whether the line has a joint, and the signal will not be stable if the line oxidation contact is not good (the crystal head or line of the line into the cat has a problem, which will also cause the line to be blocked.

2. Confirm that ADSL modem dialing is normal, because the IP automatically obtained by the network card is not cleared, so when dialing again, the network card can not get a new IP address will prompt 678, the operation method is: turn off ADSL modem, enter the network connection of the control panel, right-click the local connection and select disable, after 5 seconds, right-click the local connection to select enable, and then turn on the adsl modem dial-up;

3. If the first step is invalid, then in the case of turning off ADSL MODEM, still disable the local connection (network card), restart the computer, then enable the local connection (NIC), and then turn on ADSL MODEM to solve the problem;

4. If the above steps cannot be solved, check whether the NIC light is on, if the NIC light is not on, check the NIC and network cable.

5. If the NIC light is normal, step 1 and 2 cannot be solved, uninstall the NIC driver and reinstall the NIC driver.

6. If the above operation is invalid, contact the telecommunications department to confirm the port. The author also encountered the "678" error when surfing the Internet at home, and at first I couldn't check any problems, but later found that the port on the side of the telecommunications bureau was loose, resulting in the line not working.

7. There is another situation, the author has also encountered that if you have more than two computers at home, and the hub port used to connect to the computer is damaged, there will also be a "678 error", so you can replace a good port.

8. Some of the network conditions are normal after telecom testing, and there is also a prompt of error "678", at this time, it is necessary to consider the conflict of various application software in the process of use, which will also cause the network to be unconnected. For example, "Yahoo Assistant", anti-virus software, or firewall have abnormal errors that cause the error "678". So, if you find the error "678", you can try to temporarily uninstall Yahoo Assistant, exit the antivirus software, or temporarily turn off the firewall and reconnect to see if that solves the problem.

9. As a last resort, you can use the method of restarting the "cat" and the computer to see if it works.

1.If your modem provides routing function, set modem to pppoe automatic dialing, turn on the routing function, then connect to the hub, and set the two computers to be addresses in the same segment as the modem intranet IP but do not conflict, so that the two machines can access the Internet as long as they are turned on, and they do not affect each other;

If you do not provide routing function, you need to install PPPoE dial-up software on your PC, and then dial-up Internet access through PC, and then use the system's built-in Internet sharing, or install ** server software.

3.With a broadband router, you can automatically dial up on the router, then connect to the computer, and set the computer IP to the IP of the same network segment as the router (or set to automatically obtain the IP, but you must set DHCP on the router) to access the Internet.

Several computers can only use the router to access the Internet at the same time, not the hub, and you have to fill in the account number and password in the router, and after connecting, the router will assign an IP address to each machine, and the IP of each machine can be automatically obtained Because the hub does not have the function of assigning IP, only one machine can access the Internet.

Dial-up is not available for hub use, but for broadband routers.

Don't change sockets all the time.

My Computer --Properties -Hardware-Device Manager-Scan for Changes.

Maybe you didn't set up the extension's DNS!! I've tried to get out of this situation as well.

1. Is there a connection between the cable of all your router LAN port and the interface on your bedroom wall? If you don't have a connection, then you can access the Internet with a socket on the wall out of thin air?? If you are connected, please check the connection line and interface, but usually the probability of interface problems is very low, you can also look at the LAN port settings of the router!

Hello, this is because your hub is yes, so, the USB flash drive is recognized into.

The hub is the interface of the computer, that is, you are everything.

This is determined by your hub, depending on the model of the hub.

Use a hub to connect two computers to access the Internet, there must be a computer as the host, so that the host needs a block network card to realize, it is better to change to a router, you can realize the router dial-up Internet, two computers directly connected to the router do not need to set up the host.

Connect your computer to any of the hub's ports and connect the hub to the LAN port of a router that can access the Internet;

If the router has DHCP service enabled, the computer does not need any configuration, and it can automatically obtain the IP address assigned by the router to access the Internet.

If the router does not have DHCP enabled, the computer needs to configure a static IP address to access the Internet.

Here's how I got online:

1: Spend 3 yuan to buy a network tee. Connect both computers to the network cable. Only one computer can access the Internet.

2: Add an additional network card on a computer, as the host, set it as a network share, and implement dual-machine interconnection. This allows two computers to access the Internet at the same time.

Advantages: Only one computer is required to access the Internet, usage 1Usage when two computers are online at the same time2With this method, save a router, cheap and affordable, buy a second-hand 100 Gigabit network card on 5 yuan, disadvantages: the secondary machine alone Internet access and as a secondary network, the IP address is different, need to be changed.

Note: The practice of the network cable of the dual-machine interconnection network cable is different, so you should pay attention. There is a lot of material on the web about how to do it.