Run the unit normal LAN network obstruction suddenly, the computer terminals in the network data transceiver unusually slow, the implementation of the two computers Ping test, severe packet loss.
Trouble
First, the terminal may have infected local area network such as Blaster or Sasser virus, which causes serious network congestion; second hub switching equipment may have malfunctioned, resulting in lower device switching performance, transmission anomalies.
Troubleshooting
Central room in the network equipment, it was discovered a 24 port switch for all data access users from the blinking status light into the long bright. However, the switch in the normal communication, the light should be blinking state.
I suspect that the switch has crashed, but after the restart switch, fault phenomenon still. Disconnected access cascade line, switch lights return to normal display, access failure occurs after the cascade line.
Access lines on one level Cascade investigation revealed the source from the fifth floor of the four fault users. I use the software of the four-port data flow control, found that four had been kept outside the user data to send UDP broadcast packets. I follow it back to the client for a look and found that few people are using several sets video server access to LAN network video transmission experiment.
Video transmission through the codec to view, I found them all to set the network transmission of data to UDP broadcasts, resulting in several devices at the same time send out broadcast packets to the network broadcast storms caused serious interference, causing the network failure occurred.
To understand the situation, the author of the video transmission based on user demand, on the device itself and the network transmission mode type a change transmission protocol, the network broadcast storms are removed, local area network communications back to normal.
Summary
Part of the video network transmission equipment to facilitate online video on demand, often using the external form of broadcast packets to send. After this manner, the private network, network congestion was not significant, but the user LAN traffic is large, crowding is made more prominent. Thus, we can transfer the relevant settings to prevent this type of approach to the whole network of influence, Yeke Jianlizhuanyong network channel to protect the different modes of transmission δΈ‹ video data streams, or through the classified network switch port, set VLAN The reduction of Tai data flow the impact on the entire network to ensure the normal operation of the entire LAN.