Directly connect to the server with a network cable, but the host IP cannot be spelled

Did you add a switch in the middle?

First, see if the other end of the network cable is connected, and then, what kind of network cable is used, the line is too long will also cause the line to pass but the computer can not detect the signal.

The network cable goes through the modem (cat) and the router does not.

In this case, you should use the elimination method, first unplug all the network cables on the router, only connect one computer for testing, see if it is normal, ping between the computers to see if it is normal, you can't open the shared files on the server, I don't know whether your server is directly on the router or the switch, you should check it gradually, and finally find the problem!

Initialize the router and switch down, and then the router cannot be directly changed to Mercury R807 route after initialization. If it is normal, then connect the switch and try to connect the switch after connecting to the switch, which will be good and bad or cannot be replaced, and the router will be changed when the route is good and bad.

There is a problem with the router, or the telecom service network is down.

The ping command is based on the ICMP protocol, if the computer disables the protocol, or the firewall prohibits it, then the ping command will not work.

1. The server is set up with a firewall to prevent ping.

It is recommended to turn off the firewall on your computer or the firewall function in your network device before attempting.

2. Some network services of the server are started, blocking the ping protocol. Cannot be pinged.

3. In a local area network, the ARP information can be returned after pinging, which proves that the network is connected.

1. Other computers and servers are not in the same network segment, and there is no route to the server network segment 2. The server is set to prohibit ping

3. Or the access control is done in the intermediate network equipment.

4. Use the elimination method to slowly test in sections to find out where the problem is.

The server may have a firewall turned on.

If you can't ping the other party on the server, you can plug this port directly into the notebook, set the IP address of the peer, and simulate the user to ping the server, so that if it works, otherwise it should be in the server, and the two ends ping each other to see if it can be passed.

You have to figure out that you plug in **, and then they are not a network segment.

Then don't unplug the network cable! It can be plugged in with two network cables.

First check whether the network card is connected normally (there is no red cross), which means that the physical line connection between the computers is normal, and then set the same network segment in the IP address of the network card to ping each other. Note: You need to turn off the firewall to ping.

The probability that the firewall is not turned off is very high, and it is recommended to see if the firewall is turned off, and I have experienced it myself, and it has been because of the firewall problem for a long time.

If the ping doesn't work, then the connected network cable doesn't work, try to change the network cable.

Straight connections usually have to be crossed.

The ping must also be on the same network segment.

You can surf the Internet normally, but you can't ping your external IP address for the following reasons:

The router or modem is set to prevent pinging;

The public IP address of the ping is incorrect.

The router does a NAT mapping;

The local side has been set up.

The third and fourth situations are mostly seen in small network access companies such as the Great Wall Network and various industrial and scientific and technological parks.

The host subnet mask is not set as required. Although it is possible to access the Internet, it affects the use of many functions. For example, the problems encountered by the landlord are very representative.

The main problem is on the XP, reset the XP top, and it is best to turn off the firewall.

It used to be able to connect, which means that there is nothing wrong with the line.

Check to see if the firewall is turned on for the antivirus software and local connection, and if so, turn it off.

This is not a clear question.

1. The network cable is not in good contact, and the computer and the cat are not connected;

2. There is no broadband connection for dial-up, and the network is not connected, so you can't get the IP address;

3. The cat is not plugged in, and the computer cannot dial the local equipment;

4. The broadband expires and is pinched, and you need to go to the business hall to pay for the renewal of the contract;

5. The ISP operator's central office equipment is faulty and cannot be connected temporarily.

1. The device is connected incorrectly, and the correct connection method should be shown in the following figure

If you connect the cat to the LAN port and the computer to the WAN port, you will definitely not be able to access the Internet;

2. There is a problem with a network cable used for connection, which may be damaged or crushed by furniture, resulting in inability to connect;

3. The router has turned off the DHCP server, and all access devices need to use a static IP address to access, so it is impossible for the desktop to obtain the IP address assigned by the router;

4. The router sets DHCP to automatically assign IP ranges very small, only a few IPs can be freely assigned, and all of them have been allocated, and there is no extra IP assigned to the desktop.