Networks – IT Blog

Testing a DHCP server with dhcpperf

dhcpperf is a DHCP load testing tool.

Installing FRRouting on Ubuntu 18.04

For example, I will install FRRouting on Ubuntu 18.04

Description of DNS Amplification Attacks

In this article, I will briefly describe the principle of DDoS DNS Amplification attacks.

Installing and configuring xt_NAT

I will give an example of installing and configuring xt_NAT on Ubuntu Server 14.04 with kernel version 4.4.0-142. xt_NAT may not work on newer kernel versions. According to the developer, it should work on Linux Kernel 3.18 and 4.1. To make it work on newer versions of the kernel, you can find patches.

How to return ethX names to network interfaces

I will give an example of returning the old scheme of names of network interfaces in the Linux operating system.

Configuring RPS (Receive Packet Steering)

Receive Packet Steering (RPS) is a software implementation of RSS. Useful for example when there are fewer interrupts on the network interface than the processor cores.

Hyper-V Network Configuration

I will give an example of creating virtual switches, configuring network and NAT in Hyper-V.

Netplan. Adding Routes

I’ll give an example of adding routes in the Netplan configuration.

VLAN Generation Script for Netplan

Once it was necessary to add several hundred VLANs without IP addresses to the Netplan configuration and in order to simplify the process, I came up with the following script:

Changing gc_thresh on Linux

In this article I will give an example of changing gc_thresh on Linux, this parameter usually needs to be increased on highly loaded access servers.