Summary of embedded network problems (packet loss of network card, unrecognized network card)

Classification of network problems

It's better to troubleshoot problems that cannot be identified by the network , But there are too many links involved in network packet loss
For example, whether the switching chip is abnormal , Whether the other party's working mode is normal 、 Whether the network isolation transformer is normal 、CPU Occupancy rate 、 Impact of equipment interruption
First eliminate the network environment and the other party's equipment 、 When confirming equipment problems, such as phy Whether the clocks of overlap 、phy Whether the flow control of is turned on