Summary of points to note about port traffic

This article mainly introduces how to count port traffic under Linux. The editor thinks it is quite good, so I will share it with you now and give it as a reference. Let's follow the editor to see how to monitor and count the program's exposed port traffic without modifying the source code. You can use the Iptable that comes with Linux to add simple rules to make it play the role of port traffic statistics. However, it should be noted that the statistics will be reset to zero when the server is restarted and the Iptable service is restarted. Add ports that need statistics 1. Input monitoring The following example is to monitor the input traffic of the target port 8080--dport (abbreviation of destination port) iptables -A INPUT -p tcp --dport 80802. Output monitoring The following example is to monitor the source port Output traffic of 8080 --sport (abbreviation of source port) iptables -A OUTPUT -p t

1. Instance analysis of port traffic statistics under Linux

Introduction: This article mainly introduces how to count port traffic under Linux. The editor thinks it is quite good, so I will share it now. For everyone, and as a reference for everyone. Let’s follow the editor and take a look.

2. Please ask questions about the CACTI tool

Introduction: Ask for advice Regarding the issue with the CACTI tool, I recently used JAVA to write a program to count the traffic of network devices using the SNMP protocol. I found that in the SNMP protocol, the value of the device port traffic is the accumulated traffic value. The difference needs to be divided by the time difference to get the value of each port. seconds of traffic. However, the data type corresponding to the port traffic is unsigned 32-bit. For ports above Gigabit level, this value will reach the maximum in tens of seconds, and then it will return to zero and start accumulating again. I know that CACTI also uses SNMP

3. May I have questions about the CACTI tool

Introduction: Please tell me about CACTI Problems with the tool. Recently, I was using JAVA to write a program to count network device traffic using the SNMP protocol. I found that in the SNMP protocol, the value of the device port traffic is the accumulated traffic value. The difference needs to be divided by the time difference to get the port per second. flow. However, the data type corresponding to the port traffic is unsigned 32-bit. For ports above Gigabit level, this value will reach the maximum in tens of seconds, and then it will return to zero and start accumulating again. I know that CACTI also uses SNMP protocol

4. mysql 'max_allowed_packet' Problem

Introduction: I built one myself The website monitors the company's internal core switch port traffic and CPU utilization. During the use of the website, it was found that PHP often failed to write data to the database. After debugging, it was found that the message "Got a packet bigger than'max_allowed_packet' bytes" was displayed. Later, the mysql configuration file was modified to max_allowed_packet=512m, saved and restarted MYSQL. Then show VARIABLES like 'max_allowed_packet'; in the mysql console show

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