Troubleshoot Network Slow Problems In Linux

The Internet is an essential part of modern business. If your company uses the Internet to access information, process orders or send emails, you need to make sure that it works fast and efficiently. If your network slows down, it can affect the productivity of your employees and impact customer service. Fortunately, there are several ways that you can troubleshoot network slow problems in Linux.

Network Performance Could Be Limited on the Guest

  • If you’re using a Guest with a Public Network connection, try changing it to something more private.
  • Try using a different Virtual Machine host for your guest.
  • If nothing else has worked, try switching guest and host machines or operating systems.

Test the network between virtual machines using iPerf

To test the network between virtual machines, you can use iPerf. This is an open source tool that can be downloaded from the internet. You can use it to test network performance.

It works by sending data through a TCP or UDP connection and then measuring how long it takes for the packets to be transferred. If there are any problems with your network, like congestion, you’ll see that reflected in your results as well.

Check for misconfigured LRO or GRO

The most common reason for slow network transfers is a misconfigured LRO or GRO. LRO stands for Large Receive Offload and GRO stands for Generic Receive Offload, but they accomplish the same task. These protocols are enabled by default in many Linux distributions, but you can disable them by changing the kernel module that controls them or disabling them on your network card driver.

To disable LRO/GRO on your computer:

  • Open a terminal window on your computer and type “sudo nano /etc/sysctl.conf.” This will open up the configuration file with root privileges so you can edit it.
  • Change this line: net.core.rmem_max = 16777216

To this line: net.core.rmem_max = 1048576 (This number should be roughly half of what your RAM memory amount is.)

Check for Malicious Processes or Virtual Machines

If you suspect that a malicious process or virtual machine is causing the issue, check to see if this is the case.

  • Check for malicious processes. Use the lsof command to list open files and sockets on your system. If there are any suspicious processes running in your system (for example, netstat or ls), kill those processes using the kill command. Then rerun lsof again to see if it finds any new malicious processes active.
  • Check for malicious virtual machines: Sometimes when you install an application on Linux, a virtual machine gets installed alongside it which can cause trouble on your network connection speed or even slow down other applications that rely on network connectivity as well such as video streaming services like Netflix or Hulu Plus etc.. You can use “ps aux” command in terminal window/command prompt (WinKey+R ->Type cmd->Enter)will display all running process in current session including parent-child relationship between them which helps us understand what exactly happening behind our back during runtime so use this trick wisely with caution because sometimes some unknown third party software might be responsible for messing up things henceforth best option would be removing them from computer completely after proper analysis since they won’t create problem again anyway but still better safe than sorry!

Check your network card’s speed

Use iperf to test your network card speed.

iperf is a tool that allows you to test the speed of a network connection between two hosts. It can be used on any platform, but in this article we’ll be using it with Linux. To use iperf, issue the following command:

iperf -s -B

Disable IPv6 on your network card

If your hardware supports IPv6, there’s a chance it’s enabled by default. If so, you can disable IPv6 by editing the /etc/sysctl.conf file and adding the following line:

net.ipv6.conf.all.disable_ipv6 = 1

This will disable IPv6 functionality on all interfaces except those with the ipv6 address in their name (e.g., eth0:1). To disable it completely on an interface named eth0, add “eth0” as a suffix to the above line in /etc/sysctl.conf: net.(all|default)..disable_ipv6=1

Use Google DNS servers as your DNS servers instead of your ISP’s

  • Google DNS servers are faster than your ISP’s DNS servers.
  • The speed of your network will increase as you switch over to Google DNS servers.
  • Google DNS is more reliable than your ISP’s DNS server.
  • The reliability of your network will increase as you switch over to Google DNS servers.
  • Google’s privacy policy is superior and safer than that of most ISPs, so it’s less likely that they will be selling data about users or doing other shady things with it (although we don’t know for sure).

We hope this article has helped you solve your network problems in Linux. If you have any further questions or comments, please let us know in the comments below and we’ll get back to you as soon as possible!


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