The ping command is used to check network connectivity and estimate the round-trip time of packets. It can help you find the following network problems:
Network connectivity: Sends packets to the destination host and waits for a response to check whether the destination host is reachable. If no response is received, the network is interrupted, the destination host is shut down, or the firewall blocks ICMP traffic.
Network latency problem: Calculate packet round trip time and evaluate network speed. High latency can affect online gaming and video experiences.
Packet loss problem: Multiple packets are sent, the number of packets that do not receive any response is counted, and the packet loss rate is calculated. High packet loss rate leads to slow data transmission and poor communication quality.
Routing problem: Use the tracert (Windows) or traceroute (Linux, macOS) command to view the routing path of data packets and find that the route is incorrect or congested.
Network configuration faults: Check whether the IP address, subnet mask, and gateway are correctly configured. Incorrect configurations may cause connectivity problems.
Network congestion: Observe the latency and packet loss rate to determine whether the network is congested, optimize the network layout, or upgrade the bandwidth.
DNS resolution failure: If the domain name is used as the target, check whether the DNS server is working properly. If the resolution fails, the website cannot be accessed.
Firewall and security device fault: If no response is received, the firewall or security device may block ICMP traffic. You need to check related Settings.
Physical layer faults: Hardware faults such as network cables, optical fibers, and network adapters need to be replaced.
Quality of Service (QoS) problem: On a network with QoS policies, check whether improper QoS configuration affects the performance of certain traffic.
Although the ping command is powerful, it can only detect problems at the network layer (OSI Layer 3), but cannot detect problems at the application layer (such as HTTP errors). Some networks may disable ICMP response, resulting in inaccurate results.
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Network connectivity: Sends packets to the destination host and waits for a response to check whether the destination host is reachable. If no response is received, the network is interrupted, the destination host is shut down, or the firewall blocks ICMP traffic.
Network latency problem: Calculate packet round trip time and evaluate network speed. High latency can affect online gaming and video experiences.
Packet loss problem: Multiple packets are sent, the number of packets that do not receive any response is counted, and the packet loss rate is calculated. High packet loss rate leads to slow data transmission and poor communication quality.
Routing problem: Use the tracert (Windows) or traceroute (Linux, macOS) command to view the routing path of data packets and find that the route is incorrect or congested.
Network configuration faults: Check whether the IP address, subnet mask, and gateway are correctly configured. Incorrect configurations may cause connectivity problems.
Network congestion: Observe the latency and packet loss rate to determine whether the network is congested, optimize the network layout, or upgrade the bandwidth.
DNS resolution failure: If the domain name is used as the target, check whether the DNS server is working properly. If the resolution fails, the website cannot be accessed.
Firewall and security device fault: If no response is received, the firewall or security device may block ICMP traffic. You need to check related Settings.
Physical layer faults: Hardware faults such as network cables, optical fibers, and network adapters need to be replaced.
Quality of Service (QoS) problem: On a network with QoS policies, check whether improper QoS configuration affects the performance of certain traffic.
Although the ping command is powerful, it can only detect problems at the network layer (OSI Layer 3), but cannot detect problems at the application layer (such as HTTP errors). Some networks may disable ICMP response, resulting in inaccurate results.
https://medium.com/@jtticloud?source=post_page---post_author_info--7a5283fcea03---------------------------------------
