Troubleshooting Network Speed ​​Issue In Linux

Hopefully, if you have a Linux fix for network speed on your system, this guide can help you fix this problem.

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    Check your network configuration.Check any network configuration file.Check the DNS records of the respective servers.Experience romance both ways.Find out where the connection usually fails.Firewall settings.Reference information about the host.

    How do you troubleshoot network slowness issues?

    Also monitor and analyze slow network performance. Track disruptions, availability and performance of communicating devices, and traffic-only flow data.Revealingusers and applications needing bandwidth.Check the guidelines for prioritizing network traffic.

    Where to start troubleshooting a system?
    I think most of the sections are about software issues, but all of a sudden I found myself on a slow network and it was actually a hardware issue. I will give a description of what happened and how I solved it.

    Network System Problem

    How do I check my network speed in Linux?

    You can view the network speed / bandwidth between Ubuntu / CentOS / Debian / Fedora Linux or Unix using the iperf command. Iperf commands display information about bandwidth, latency, jitter, and datagram loss. It is a tool for measuring network bandwidth. It can check TCP or UDP throughput.

    I used rsync for backups, and one day a good rsync told me that it wasn’t taking any data from the remote host. I don’t remember exactly the accident report.

    To debug and isolate the problem, I used iperf, an application that measures connection speed. Do you have an instance,which runs often on the server, and an instance that runs on your client. He sees how fast your own personal network is.

    Iperf reported that my typical network speed is actually below the nominal 100 Mbps. I only have 80 kbps.

    This all happened after I bought a new computer, so I decided that the problem was in the network card and started doing some serious research.


    Which of the below can you use to troubleshoot a connectivity issue in Linux?

    The ip command is the best all-in-one utility for viewing and managing Socialize objects on your Linux system, consisting of IP addresses, routes, and dining ARP tables. It is a useful networking tool that helps you troubleshoot network connectivity problems.

    I ran the social media card diagnostics on an HP z240 workstation that I purchased in the UEFI BIOS and it repeatedly resulted in big errors.

    However, there was no problem, and I discovered it shortly before contacting the appropriate helper.

    However, I thought the problem was with the hardware network or card, so I ran the ifconfig command. I have seen that not all error fields display zero as they should, and the number of errors increases as network traffic increases.

    troubleshooting network speed linux

    To better understand where slippage comes from, I ran some Ethtool this way

    where eno1 is the corresponding NIC (I’m used to knowing it as eth0, this is definitely new the name I saw on Linux Ubuntu 16.04 LTS).

    I was able to confirm with Ethtool that errors turned into errors, all CRCs, because the rx_crc_errors field was not empty.

    I used a crossover cable to transfer data between the two methods I have, and as a result, the correct network speed in the real world was probably close to nominal (100 Mbps). So the problem was what kind of router or cables and wires.

    What Have I Tried

    troubleshooting network speed linux

    I tried to replace the cable with a new one, I thought that the contacts could oxidize. But nothing changed, so I identified the real culprit: the router.


    Luckily, I can reduce the speed of the network cards from 100 Mbps to 10 Mbps. Everything came back to work miracles.

    I set the network speed to a lower speed with the following command placed in the /etc/rc.local file on my Ubuntu.

    You can also say that you can set a lower speed when accelerating Windows 10. Some

    How do I troubleshoot Linux server performance issues?

    Troubleshoot common Linux performance issues.Frequent presentation problems.Investigate performance issues.Use these sysstat packages to get historical information about the implementation of a resource.Eliminate irregular and sudden slowness.Analyze the use of CDs with iostat.Memory usage.

    For logical reasons, the ISO / OSI Level 2 section associated with my router actually no longer works and is only supported with The speed is 10 megabits.

    I keep swapping the router, but for now it’s best to slow down to keep the 100Mbps network running at near zero speed.

    I found this page helpful when troubleshooting network problems

    / sbin / ethtool -south eno1 speed 10 duplex including Autoneg and

    Troubleshooting a slow network or losing system packets can be difficult. In addition to slower networking, you may experience other symptoms such as:

    • Attempts to connect to the server using ssh and / or sftp will time out or delay the final response.
    • In addition, there is a lot of retransmissions from the community when network traffic is high.
    • Processing the Ifconfig “eth [x]” command may result in a large number of packets being lost.

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  • – Command output: netstat -s shows increasing values ​​for the following statistics type: (execute multiple times from all “netstat -s”):

    – Instruction output: ethtool Eth [x] -s displays increasing values ​​ Compared to the counter: “rx_fw_discards”:

    Reasons For Poor Network Performance

    There can be several reasons for slowing down the network. But here are some of the possible resolutions:

    • The network is already very busy, and there are traffic jams up to maximum capacity. Welcome
    • the accumulated buffers are not sufficient to load the connection.
    • Packet loss due to physical layer interference.

    Troubleshoot Network Performance Issues

    1. Check the network speed with the iperf tool and find out if the network bandwidth is close to the maximum observed speed.

    2. The packet values ​​for the network settings clearly support the maximum network speed. Find the bandwidth latency (BDP) value and set the appropriate network size. This is similar to calculating the product of the channel data rate and the round trip time. For

    – 1 Gbps network and 0.1 s round-trip time, BDP = (0.1 10 ^ 9) / 8. In such a network, define the following parameter values ​​under each: file /etc/sysctl.conf < / p>

    a) No reloading system start-up is not required.

    b) In this post-hop, it is necessary to monitor this output of the “netstat -s” command and therefore check if the following routes continue to work:

    3. Increase the size of the RX ring screen of the NIC. There is a trade-off with this customization number. A higher dollar value can delay processing of the packet type, while a lower value results in packet loss if the same driver experiences a delay in processing incoming packets. In general

    a) First increase the size of the RX ring and follow the output of the command “ethtool -S eth [x]”.

    b) To make this change irreversible, add the following to your document: / etc / sysconfig / network-scripts / ifcfg-eth [x]:

     13336 packets that were dropped from the search queue due to socket barrier overflowThe list queue of this socket has overflowed 516 times516 SYN to LISTEN are ignored.2040077 crashed on the receive line due to a low socket bufferTCPBacklogDrop: 744165 
     # test template /etc/sysctl.confnet.core.rmem_max = 1250000net.core.wmem_max corresponds to 1250000net.ipv4.tcp_rmem = 4096 87380 1250000net.ipv4.tcp_wmem matches 4096 1250000 
     # 65536 vi /etc/sysctl.confnet.core.netdev_max_backlog implies 30000net.ipv4.tcp_max_syn_backlog = 4096 
     Packets that were dropped from the receive line due to a socket buffer overflowtimes the whole list queue from a socket of any type of overflowSYN for ignored sockets LISTENThe number of packets has decreased in the receive queue due to insufficient connection bufferTCPBacklogDrop 
     # ethtool -G eth [x] rx 512 
     # test template / etc / sysconfig / network-scripts / ifcfg-eth [x]ETHTOOL_OPTS = "- G RX 512" 

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