Networks – Page 4

Solution for Speedtest CLI error “Failed to find a working test server”

Once, when running the Speedtest CLI on one Linux server, I noticed the following error:

Installing and updating the ixgbe driver

I will give an example of installing or updating ixgbe drivers on Linux.

Installing and using hping

hping is a free packet generator and analyzer, well suited for testing the security of network devices.

Distribution of network card interrupts across processor cores

I will give an example of the distribution of interrupt network interfaces on the processor cores.
For example, I’ll take a server with accel-ppp, 6Gb/s traffic, 500K + pps, nat with ipoe and 6000 dchp clients.
Also, be sure to disable hyper-threading in the BIOS, since load balancing on virtual cores can greatly increase the load on some physical cores.

How to find out on which NUMA node network interfaces

I will give an example of viewing on which NUMA node the network interfaces are located in Linux.

Installing and Using NetHogs on Linux

NetHogs is a network monitoring tool.

LACP. Configuring Link Aggregation on D-Link Switches

Link aggregation is a technology that allows you to combine several physical channels into one logical channel, which increases the bandwidth and reliability of the channel.

Installing and configuring FreeRADIUS

Installation on Ubuntu:

Disabling IPv6 on Linux

First, check whether IPv6 protocol support is enabled or disabled (0 – on, 1 – off):

Using the arping utility

arping – a utility that sends arp packets to a specified host and displays responses.
It is executed from the root user, in Linux, for this, from under a regular user, you can append before each sudo command.