What is the reason why the intranet cannot ping the IP address?

The reasons are: 1. The other party has shut down, or the address does not exist on the network; 2. The other party is not in the same network segment as you, and you cannot find the other party through routing; 3. The other party does exist, but it is set ICMP packet filtering; 4. The IP address is set incorrectly; 5. The protocol is not installed properly and cannot send and receive ICMP packets.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

The reasons are:

1. The other party has shut down, or the address does not exist on the network at all.

2. The other party is not in the same network segment as you, and you cannot find the other party through routing.

3. The other party does exist, but ICMP packet filtering is set up (such as firewall settings).

4. Wrong setting of IP address.

5. The protocol installation is not normal and ICMP packets cannot be sent and received.

Extended information:

Principle of ping

Send a data packet of a certain length to the specified network address. According to the agreement, if specified If the network address exists, a data packet of the same size will be returned. Of course, if it is not returned within a specific time, it will be a "timeout" and it will be considered that the specified network address does not exist.

ICMP protocol is sent through IP protocol, which is a connectionless and unreliable data packet protocol. In Unix/Linux, the serial number starts counting from 0 and increases in sequence. The ICMP sequence number of the Windows ping program is irregular.

ICMP protocol data packet in actual transmission: 20-byte IP header, 8-byte ICMP header, 1472 bytes 38 bytes.

ICMP message format: IP header (20 bytes) 8-bit type 8-bit code 16 checksum (different types and codes have different formats).

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