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_In recent years, many service providers have been using NetFlow.
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Port monitoring is not a complicated technology, but it can solve some local problems. For this reason, a special small tool-port listener has appeared. For example, when Win2000 is OOB***, NETSTAT will crash before waiting for it. Many people already know that you can use NETSTAT -AN to check the current connections and open ports, but NETSTAT is not a panacea. Ntop can monitor almost all protocols on the network: TCP/UDP/ICMP, (R)ARP, IPX, Telnet, DLC, Decnet, DHCP-BOOTP, AppleTalk, Netbios, TCP/UDP, FTP, HTTP, DNS, Telnet, SMTP/POP/IMAP, SNMP, NNTP, NFS, X11, SSH and eDonkey, a protocol based on P2P technology. At present, network-managed switches and routers on the market all support the SNMP protocol, and Ntop supports simple network management protocols, so network traffic can be monitored. If you use mobile phone bills to compare traffic, MRTG is like providing a telephone bill for the total cost, while Ntop lists the details of each cost.
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Detailed information such as the host, the target host of each communication, the sending time of the data packet, and the delay of transmitting the data packet. _ Ntop can determine various problems on the network by analyzing network traffic it can also be used to determine whether there is a VPN network system it can also easily display a specific network protocol that takes up a lot of bandwidth. Detect communication bottlenecks in the network environment and record the time and process of network communication. Analyze the communication failure in the network environment Convert the intercepted data packet into an easily identifiable format Automatically identify useful information from the network Ntop mainly provides the following functions: NTOP can even list the network bandwidth utilization of each node computer. Using NTOP to display network usage is more intuitive and detailed than other network management software. _ Ntop is a tool for monitoring network traffic. Ntop is integrated in the Ossim system and can be used directly. Ntop, which will be introduced in this section, can provide a detailed list of network traffic. Through tracking the number of connection sessions, source/destination address pair analysis, TCP flow analysis, etc., abnormal traffic in the network can be discovered in time, and real-time alarms can be issued to ensure network security. Monitoring and analyzing network traffic can establish network traffic benchmarks. Service deployment to improve network performance. Through flow measurement, it can not only reflect whether the network equipment (such as routers, switches, etc.) is working normally, but also reflect the resource bottleneck of the entire network operation, so that managers can take fault remedial measures and carry out relevant measures in time according to the operating status of the network. In the actual network, if the network traffic is not well controlled or network congestion occurs, it will lead to a decrease in network throughput and network performance. _Network traffic reflects the operating status of the network and is the key data to determine whether the network is operating normally.