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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...

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

Posted by Alex On April 7, 2022

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

Posted by Alex On March 1, 2022

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

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...

Where NetworkManager stores settings (SOLVED)

Posted by Alex On January 9, 2022

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...