The expert came in to help with the network .

VLAN assignment of switches. Follow-up: Can you elaborate a little more?

That is, the switch should be a switch that can be managed, through the serial port of the switch can be divided into different VLANs, if different in different VLANs, even a network segment is unable to communicate, if you want to set up, look at the manual of your switch to understand. Follow-up:

Now it's like this, the device and the PC use a network cable, the same IP address, the server can ping the PC, after replacing it with the device, it can't ping, the device has no problems, and even get to the manufacturer to do testing, there is no problem at all, there is no problem with the same network segment across network segments, it's really weird: the switch connected by the device is still directly connected to the computer, if it is connected to the switch, or the above problem. Follow-up:

It must be connected to the switch, an IP, you can use it on a PC, but you can't use it on a device, I don't understand this: it doesn't have to be related to the IP of the device, it may be related to the MAC address. Follow-up:

PC is a laptop I found casually, before I took it, the IP was automatically obtained, which will bind the MAC, all the IP is not bound: you can try without the switch, I mean switch settings, not a computer. Follow-up:

I don't understand what you mean, can you tell me how to do it: Your problem is caused by the problem of switch settings, look at the description of the switch, set it up, the settings of each switch are different, it is recommended that you read the manual first. Follow-up:

I want to ask again, how to set up the switch to achieve such an effect, that is, the same IP, can be used on the PC, but it can't be used on the device Follow-up question: The problem is solved, the blind cat touches the mouse and touches it, just restart the port of the switch, it's weird, thank you for your help.

Does your PC use the same network cable that is connected to the device? In this way, you can rule out problems such as equipment network cables, switch ports, VLANs, etc

I mean to ask you to unplug the network cable of your device that can't ping, and find it on your PC for testing Follow-up question: According to the test you said, the result is that the network cable of the device that can't ping can be plugged into the computer to ping through: Then you can basically confirm the setting problem on that device Follow-up question:

When crossing network segments, it can ping the PC, but the server still can't ping the device. In the network segment used by the server, the same network cable and the same IP can be pinged on the PC, but it cannot be pinged when the server is connected to the device. And change a network segment, the PC and the device can be ping, at this time the server can also ping the PC, still can't ping the device:

If the device and server are connected to the same switch, log in to the switch and ping the device directly on the switch.

It is recommended that you explain the previous two points:

1.If you want to use wireless Internet access, first know the link password of the router, if you connect it directly, it can only mean that the network department is derelict in its duties, how can anyone not change the password, so the punishment must be borne by him.

2.What you want to say should be that the MAC address and the IP address are bound to the pair, then you tell him, at the beginning, enter ipconfig all in the run, what MAC address, IP, and gateway all know, and it is very simple to change, and I can change it without software. If someone from your network department says he won't, I will do all the work of your company's network department by myself and let your network department disband, and you ask him if he dares.

3.I think the problem may be here, you offend people, is it that sometimes the methods of ordinary work are not very appropriate, and people estimate you. The Human Network Department installed wireless for you, and you let it be withdrawn, which is obviously not good-looking.

It's too easy for people to frame you up, usually make the relationship better, eat and drink when it's okay, and everything will be easy to say.

I work in the IT industry, mainly Cisco. I know that sometimes being human is more important than technology. Pure hand-to-hand play, these 20 points are really tired,

Usually 2 or 3 lines will be changed to 50,100 points, just kidding, it would be nice to be able to help you. It's not easy to mix in this society. Long live understanding.

The guy who installed the wireless router was from your department? Who is a wireless router for? Will there be insufficient IP addresses on the intranet? Your narrative is problematic, incomplete or incorrect.

Obviously, your wireless network card is not disabled, and as soon as you turn it on, the computer automatically finds the wireless network and automatically connects it when the wired network is not ready.

Tell me about it, after all, this thing is not intended to be accessed. Next time, remember to disable the wireless network card and it will be fine.

The network is small, but the relationship is big.

Agree with the upstairs solution!

Three points can be seen from your question:

1. Whether you plug in the network cable or not, you are connected to the Internet through broadband dial-up, which means that you are using China Telecom's Tianyi home broadband E8 or E9**PPPOE connection to the Internet; Rather than using a wireless router or other carrier's network; In this way, the problem is solved, which is the so-called right medicine;

2. This moden of telecom is commonly known as "cat", whether it is ADSL cat or EPON fiber optic cat, we are collectively referred to as "cat" for the time being, it has and enables the function of wireless connection, so this is further helpful for us to solve the problem.

3. A few days ago, your laptop was restored, which means that the password of your wireless connection has been emptied, if you do not enter the wireless password when connecting again or accidentally enter the wrong one, of course, you can't connect it.

It is the three reasons that cause the wireless connection to fail, and the following methods are used to troubleshoot and solve them:

1. The "cat" provided by Telecom has turned off the wireless function or the wireless function module has broken down due to lightning or high voltage, so it requires the maintenance personnel of Telecom to come to the door to detect and replace the solution until the customer can use it normally;

Second, the second possible reason is that your own laptop wireless network card and the system on wireless service configuration is not enabled normally, for this, you can take the notebook to other wireless places to test whether the function of the wireless network card is normal or not, if it is normal, then connect the telecom cat, three, if your laptop can find the network named by the cat of telecom in the wireless network, double-click to connect, enter the wireless password, establish a point-to-point wireless connection, and then broadband dialing, If someone changes the wireless password or you enter the wrong wireless password, of course, you can't connect.

I've changed the system, so I'm looking for someone to take a look at it.

In the past, your broadband was wireless, but now it is wired, so you have to plug in the network cable.

Is it through a router to access the Internet?

You can install e-Surfing broadband dialing software to try.

I also had this problem on the 4th computer at home, and then the 5th didn't know why.

There are many problems with wireless routers, you can try to brush the router system, but you can only try another one.

Let me answer question 2:

1. The broadband using telecommunications is PPPOE, that is, the service of dial-up Internet access. Now the IPv4 address is very tight, and it is impossible for this telecom to assign you an independent IP address, so your external IP is not unique.

2. If you enter ipconfig under cmd, it will show the private network address of the local area network, which is impossible to access through the external network.

3. Why does the IP address keep changing? Because the IP address you are using temporarily is randomly assigned by the telecom bars in the default address range, you share an address pool with other people when dialing up, for example, 100 people actually only share 5 addresses, and each person is assigned by subnet mask.

Dynamic domain name binding for IP changes.