Many friends have encountered data packet loss when using the network and surveillance camera system in security monitoring projects. The reasons for data packet loss are various. The following will introduce network data packet loss to everyone. The reason for the packet loss and the camera.
Camera packet loss cause 1: routing error
A network path error can also cause packets to fail to reach the destination host. For example, if the host's default route is configured incorrectly, packets sent by the host to access other networks will be dropped by the gateway. However, this type of packet loss is a normal type of packet loss, which is expected and will not affect the network.
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Camera packet loss cause 2: equipment failure
Device failure mainly refers to device hardware failure, and does not include packet loss caused by improper software configuration. If the network card is bad, a certain port of the switch has a physical fault, and the electrical port of the optical fiber transceiver does not match the duplex mode of the network device interface or the device interface at both ends.
A switch port loses packets due to the failure of the fiber module. The switch hangs after a period of communication, that is, it cannot communicate, and it returns to normal after restarting. After observing for a period of time, it was found that there was a problem with a certain optical fiber module, and a new module was replaced, and everything was normal.
The reason is that the switch performs CRC error detection and length check on all received data packets, discards the packets with errors detected, and forwards the correct packets.
However, some erroneous packets in this process have not been detected in the CRC error detection and length check. Such packets will not be sent or dropped during the forwarding process, and they will accumulate in the dynamic The cache cannot be sent out. When the cache is full, the switch crashes.
The end result is that the packet cannot reach the destination host.
Camera packet loss cause 3: physical line failure
The network administrator finds that the WAN line is intermittent and intermittent. When this happens, the line may be faulty, or it may be the cause of the user. In order to distinguish whether it is a line fault, you can do the following test.
If the WAN line is implemented through a router, you can log in to the router and send a large number of data packets to the peer router's WAN interface for testing by extended ping.
If the line is implemented through a Layer 3 switch, you can connect a computer at each end of the line and set the IP address to the WAN interface address of the local Layer 3 routing switch. Use the "ping peer computer address -t" command to test.
If no packet loss occurs in the above test, it means that the line provided by the line operator is good, and the cause of the failure lies in the user himself and needs to be found further.
If packet loss occurs in the above test, it means that the fault is caused by the line provided by the line supplier, and you need to contact the line supplier to solve the problem as soon as possible.
There are still many packet loss caused by physical lines, such as fiber connection problems, jumpers not aligned with device interfaces, and twisted pairs and RJ-45 connectors.
In addition, data line errors caused by random noise or burst noise on communication lines, interference with radio frequency signals, and signal attenuation may cause data packet loss. We can check the quality of the line with the help of a network tester.
Camera Lost Cause 4: Network Congestion
There are many reasons for the increase in packet loss caused by network congestion, which is mainly caused by the heavy use of router resources.
If it is found that the network speed is slow and the packet loss rate is increasing, then you should show process cpu and show process mem. Generally, it is found that the IP input process occupies excessive resources.
Next, you can check whether fast switching is disabled on the large-traffic egress port. If it is, you need to reuse it.
Take a look at whether Fast switching on the same interface is disabled. For example, when an interface is equipped with multiple network segments and the traffic between these network segments is large, the router works in process-switches mode. In this case, you need to execute commands on the interface. "Enable ip route-cache same-interface".
Next, use the show interfaces and show interfaces switching commands to identify the ports through which a large number of packets enter and exit. Once you confirm that you have entered the port, open IP accounting on the outgoing interface to see its characteristics. If it is an attack, the source address will keep changing but the destination address will not change. You can use the command "access list" to temporarily resolve such problems (as close to the source of the attack as possible On the device), the final solution is to stop the attack source.
There are still many situations that cause network congestion in the application, such as a large amount of UDP traffic. You can solve this problem by solving the spoof attack.
A large number of multicast streams and broadcast packets traverse the router. The router is configured with IP NAT and many DNS packets traverse the router. After the above situation causes network congestion, both communication parties adopt flow control to discard packets that cannot be transmitted.
The above are some simple analysis of the reasons for network data packet loss and camera packet loss. I hope it will be helpful to everyone.
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