I used a routing broadband connection, and after modifying the MAC, the re broadband connection show

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.

It is recommended to use a router myself, and I have never had this annoying situation since I used it.

You're invincible.,MAC address can't be changed casually.,Restart the route,Restore to factory settings!

Have you modified the MAC address of your router? Let's go back to factory settings.

Is your telecom bound MAC address there? If you use a router, why do you need a broadband connection??? The router has settings and a password on it.

You can route the link. How can you still use a broadband connection with routing? You have to break out the number of the starry sky.

If it is a broadband problem, please call the broadband customer service ** and ask them to check for you. If it is a router problem, please call the brand router customer service for **consultation, they have **guidance.

1) If it is a problem with the broadband itself, first directly connect the broadband network cable to test, if it is a broadband problem, contact the broadband customer service to solve it.

2) If it's a problem with the router, if it can be used originally, it can't be used for the time being, my own practice is to disconnect the power of the router and plug it in, and I'll take a look. In there is a factory reset, from the new strict according to the manual settings can be used, I don't understand, it is not recommended to set it at will (this is under the premise of the correct physical connection, sometimes the router is slow or failed to find the IP address, not that the router is broken).

If it can't be solved all the time, it is recommended to call the customer service of the router, they have **** guidance, I encounter a problem that I can't solve by myself, it is very useful to consult the advice they gave, and they will give the correct advice for your settings or operations.

3) If you turn off the wireless switch, turn it on, if it is a wireless connection with software, it is normal for the software to be difficult to use and often have problems, there is no better way, use a router. In addition, it is caused by the network card driver is not or is not suitable, and whether there is a problem with the network cable interface or network cable.

4) If it is caused by a system problem, it is recommended to restore the system or reinstall it.