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This article mainly introduces "how to analyze network performance problems in Linux system". In daily operation, I believe many people have doubts about how to analyze network performance problems in Linux system. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful for you to answer the doubts about "how to analyze network performance problems in Linux system". Next, please follow the editor to study!

Common commands for Linux systems to view the network

Ifconfig command to view and configure network status

Turn off and start the network card

Ifdown network card device name # disable the network card device ifup network card device name # enable the network card device

Query network status netstat options

Option:-t: list TCP protocol ports-u: list UDP protocol ports-n: do not use domain name and service name, but use IP address and port number-l: list only network services in monitoring state (only TCP has listening state)-a: list all network connections-r: list routes, function is the same as route command

Check the DNS nslookup address or the dig command dig hostname mx dig hostname cname dig hostname + short [dig is a very powerful command, you can @ server to get the dns record on a dns server.] (https://www.howtouselinux.com/post/linux-5-ways-to-check-a-remote-port-is-open) view native DNS server

Learn more about Linux network commands to view this post.

Network test command

The ping option ip or domain name ping uses the icmp protocol to obtain the status of the peer machine, which is usually checked by echo request and echo reply. More information about the icmp protocol can be found in this post. Check whether the network is unblocked option:-c: number of times, specify the number of ping packets

Telnet [domain name or ip] [port] remote management and port probe commands are rarely used because the protocol is not encrypted, and are mostly used to detect whether a port is open. We can also use python to determine the condition of remote network ports. You can check this post.

Poor performance of Linux network

Poor network performance is a problem that is not easy to analyze. We can probably analyze it from the following aspects.

The physical layer looks at the network port network packet loss and the physical link. There are corresponding indicators to measure on os.

Mtu configuration of data link layer links, packet grouping, reassembly testing, and so on.

The data retransmission of tcp is recorded in the output of netstat-s.

This post on the application layer describes in detail how to analyze the poor performance of Linux networks.

All of the above network indicators can be obtained through the graphical monitoring of Linux, so that we can get real-time data to help us analyze the corresponding problems. We use open source software, and the performance is very powerful.

Some network configurations will also have a great impact on performance, such as tcp window scaling will greatly improve the bandwidth of the network.

At this point, the study on "how to analyze network performance problems in Linux systems" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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