Many people have encountered data packet loss during the use of the network and surveillance camera systems. The reasons for data packet loss are various. Here are some reasons for network data packet loss and camera packet loss. s reason.
Cause Analysis
Camera Lost Packet Cause 1: Routing Error
The network path error can also cause the packet to fail to reach the destination host. If the host's default route is configured incorrectly, packets sent from the host to other networks will be discarded by the gateway. However, this kind of packet loss is a normal case of packet loss. It is expected and will not affect the network.
Reasons for Camera Lost Packet 2: Device Failure
Device failures mainly refer to hardware failures of the device and do not include packet loss due to improper software configuration. If the network adapter is bad, a physical port failure occurs on one port of the switch, the electrical port of the fiber transceiver is connected to the network device, or the duplex mode of the device interfaces on both ends does not match.
Recently, the author found a packet loss phenomenon caused by the failure of the optical fiber module of a switch port. The switch crashed after communicating for a period of time, that is, it could not communicate, and it returned to normal after restart. After a period of observation, it was found that there was a problem with a fiber module, and a new module was replaced. Everything was normal.
For the reason, the switch will perform CRC error detection and length check on all received data packets, and will check out the packets with errors and discard the correct packets. However, some erroneous packets in this process have not detected errors in the CRC error detection and length check. Such packets will not be sent during the forwarding process and will not be discarded. They will be accumulated in the dynamics. In the cache, it can never be sent out. When the cache is full, it will cause the switch to crash. The end result is that the packet cannot reach the destination host.
Reason for Camera Lost Packet 3: Physical Line Failure
When the network administrator discovers that the WAN line is disconnected, when this happens, there may be a line failure or it may be due to 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 use the extended ping to send a large number of packets to the remote router's WAN interface for testing.
If the line is implemented through a three-layer switch, connect one computer to the two ends of the line and set the IP address to the WAN interface address of the local Layer 3 routing switch. Use the command “ping the peer computer address -tâ€. test.
If the packet loss phenomenon does not occur in the above test, it indicates that the line provided by the line operator is good, and the cause of the failure lies in the user himself and needs further searching.
If the packet loss phenomenon occurs in the above test, it means that the fault is caused by the line provided by the line supplier. You need to contact the line supplier to solve the problem as soon as possible.
There are many packet loss phenomena caused by physical lines, such as fiber connection problems, jumper lines that are not aligned with the device interface, twisted pair cables, and problems with RJ-45 connectors. In addition, datagram errors caused by random noise or burst noise on communication lines, RF signal interference, signal attenuation, etc., may cause data packet loss. We can use the network tester to check the quality of the line.
Reasons for Camera Lost Packets 4: Network Congestion
There are many reasons for the increase in packet loss rate due to network congestion, which is mainly caused by the large number of router resources.
If it is found that the network speed is slow and the packet loss rate is rising, the show process cpu and show process mem should be displayed. Under normal circumstances, it is found that the IP input process occupies excessive resources. Next, you can check whether the fast switching is disabled on the large traffic egress port. If yes, you need to use it again.
Let's see if Fast switching on the same interface is disabled. For example, if an interface has multiple network segments and the traffic between these segments is heavy, the router works in the process-switches mode. In this case, you need to run the command on the interface. "enable ip route-cache same-interface".
Next, use the show interfaces and show interfaces switching commands to identify the ports that come in and out of a large number of packets. Once you have confirmed 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 change but the destination address will not change. You can use the command “access list†to temporarily solve this type of problem (preferably near the attack). Source device configuration) The ultimate solution is to stop the attack source.
There are many situations in the application that cause network congestion, 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 there are many DNS packets traversing routers. After the above situation causes the network to be congested, the communication parties adopt flow control and discard packets that cannot be transmitted.
The above is a brief analysis of the reasons for network data packet loss and camera packet loss. I hope to help everyone.
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