I will give a short list of popular network emulators and network equipment:Continue reading “List of network and network equipment emulators”
ifstat is a program for collecting statistics on network interface load.Continue reading “Installing and using ifstat on Linux”
I will give an example of installing Quagga in Ubuntu Server 18.04 (bionic).Continue reading “Installing Quagga on Ubuntu Server 18”
One day after restarting the Ubuntu server, due to the long start of a large number of network interfaces, my script which increased the values of the buffers and also performed other settings was performed ahead of time, respectively, the changes did not apply and I found out about this problem only after 24 hours, so I decided monitor current RX and TX buffers.Continue reading “Monitoring current RX and TX network interface buffers in Zabbix”
For example, take the server with the operating system Ubuntu Server 14.04, in which let’s say we changed the network settings when executing the commands:Continue reading “Why service networking restart or /etc/init.d/networking restart does not work”
Once on one high-load access server with about 5 Gb/s traffic in /var/log/syslog, errors began to appear frequently:Continue reading “Solution «TX driver issue detected, PF reset issued»”
In this article I will briefly describe the difference between MASQUERADE and SNAT.
MASQUERADE. Less fast routing than SNAT with mass requests, since for each new connection an IP address on the external network interface (WAN) is determined. Great for home use routers and when changing the IP address on the WAN interface.
Continue reading “Difference between MASQUERADE and SNAT”
The script every second displays the number of incoming and outgoing packets per second on the specified network interface.
Place the contents of the script into a file, for example, pps.sh and execute by specifying the name of the network interface (you can stop the execution of the script with CTRL+C):
ipset – a tool consisting of a kernel module, libraries and utility, allowing you to organize a list of networks, IP or MAC addresses, etc., which is very convenient to use for example with IPTables.
Installation command in Ubuntu:
Once I noticed on one of the computers that nothing was displayed in the network environment, and after selecting “Enable network discovery” in “Control Panel \ Network and Internet \ Network and Sharing Center \ Advanced Sharing Options”, the choice was still on “Disable network discovery”.
Continue reading “What to do if “Network Discovery” does not turn on in Windows”