Tag: IP

What happens if an IPv4 client tries to access an IPv6-only server (SOLVED)

Posted by Alex On April 9, 2022

Question: Hey! The article says that IPv6 is a completely different protocol, I had a question. If my recipient's email works only on IPv6 (that is, his mail server listens only through the IPv6 protocol), does this mean that when sending a letter from a mail server that is connected only to IPv4, the letter simply will not reach the...

Script to connect and disconnect from OpenVPN depending on server availability

Posted by Alex On January 25, 2022

Task: Branch subnets are connected via OpenVPN. All clients connect to the server and routes to the Internet are set through the OpenVPN server. Everything works, but there is a problem. If the OpenVPN server for some reason loses Internet connection, then all other branches also lose Internet access, because the traffic does not go through its gateway, but through...

How to manage VPN Settings in GNOME 3

Posted by Alex On November 25, 2021

A popular example of a Linux distribution using GNOME 3 is Ubuntu. Install NetworkManager VPN plugin for OpenVPN In order for you to have the menu item shown in this manual in NetworkManager, you must have the NetworkManager VPN plugin for OpenVPN installed. Some distributions have it installed by default. If you don't have it, run one of the following...

How to manage VPN Settings in Xfce

Posted by Alex On November 25, 2021

Popular distributions with Xfce include Kali Linux and Xubuntu. In Xfce, networks are managed in the “Network Connections” window. Install NetworkManager VPN plugin for OpenVPN In order for you to have the menu item shown in this manual in NetworkManager, you must have the NetworkManager VPN plugin for OpenVPN installed. Some distributions have it installed by default. If you don't...

How to manage VPN Settings in Cinnamon

Posted by Alex On November 25, 2021

The Cinnamon desktop environment is primarily characteristic of Linux Mint. Install NetworkManager VPN plugin for OpenVPN In order for you to have the menu item shown in this manual in NetworkManager, you must have the NetworkManager VPN plugin for OpenVPN installed. Some distributions have it installed by default. If you don't have it, run one of the following commands to...

Simultaneous use of multiple OpenVPNs on one server

Posted by Alex On November 25, 2021

You can simultaneously use several OpenVPN processes on the same server, while they will work on different ports and provide separate virtual private networks that do not overlap with each other. Multiple instances of OpenVPN are provided out of the box, but additional configuration is required. 1. OpenVPN services must use different ports All OpenVPN services must use a free...

Comparison of performance (data transfer rate) of OpenVPN over UDP and TCP

Posted by Alex On November 25, 2021

The previous article showed how to use OpenVPN with TCP instead of the default UDP. It is also known that the use of the TCP protocol is not recommended because, due to the “overhead” of the TCP transport protocol, less payload will be transmitted, since part of the channel will be occupied by the transmission of overhead information necessary to...

How to use OpenVPN with TCP protocol

Posted by Alex On November 25, 2021

By default, OpenVPN uses UDP and it is officially recommended to use it. However, TCP also works great with OpenVPN and you can use it if needed. Theoretically, the TCP protocol has more “overhead”, that is, some part of the transmitted data will not carry the payload, but is only necessary for the normal operation of TCP, which monitors the...

How to change configuration files when migrating from OpenVPN 2.4.* to OpenVPN 2.5.*

Posted by Alex On November 25, 2021

As of fall 2021, OpenVPN has moved to the new major branch 2.5.* for almost a year. If you were slow to update, now the new branch can be considered time-tested. However, if you are upgrading from the 2.4 branch, you may need to adjust the configuration files. 1. In the server and client configuration files, replace the line cipher...

How to configure Squid proxy to work with multiple users

Posted by Alex On October 13, 2021

For example, the task is to organize the work of Squid with several users, each of which received an IP address (the same for all) and a port number (individual for each user) as proxy settings. Also, users have an individual username and password. The server has several external IP (in this case, IPv6) addresses, you need to make sure...
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