Tag: computer network

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

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...

How to edit the Access denied page in Squid? How to insert custom pictures and mail?

The custom Access denied page can only be shown if the user connects via HTTP. For HTTPS connections (which are currently the vast majority), it is impossible to change the displayed page (that is, display the configured Access denied page) due to the very nature of HTTPS, which is precisely designed to ensure that the transmitted data cannot be modified....

How to connect to Tor with OpenVPN

Connecting to Tor via a VPN is usually used in practice not so much to increase anonymity (although such use takes place), but to bypass the blocking of the Tor network. In some countries, the Tor network is blocked at the state level, so to connect the Tor browser or the Tor service, you must use bridges – intermediate nodes...

Script to connect and disconnect from OpenVPN depending on server availability

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...

Where NetworkManager stores settings (SOLVED)

NetworkManager Configuration Files NetworkManager supports various plug-ins that can define new locations for storing configuration information. The main configuration file for NetworkManager, which is usually changed, is /etc/NetworkManager/NetworkManager.conf. You can view its contents with the following command: cat /etc/NetworkManager/NetworkManager.conf In addition to this file, NetworkManager settings can be saved in the /etc/NetworkManager/conf.d and /usr/lib/NetworkManager/conf.d directories. For a list of all...

How to manage VPN Settings in GNOME 3

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

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

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

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

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...
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