In Linux, IPv6 security is maintained separately from IPv4. Note: This tutorial covers IPv4 security. In this guide, we will discuss how to implement port knocking as a method of obscuring your SSH daemon on an Ubuntu 12.04 VPS using the knockd package. It allows your firewall to protect your services until you ask for a port to be opened through a specific sequence of network traffic. Port knocking is one method of obscuring the services that you have running on your machine. You want access when you need it, but want it blocked off otherwise. However, any computer connected to the internet is inevitably targeted by malicious users and scripts hoping to take advantage of security vulnerabilities.įirewalls exist and should be used to block access on ports not being utilized by a service, but there is still the question of what to do about services that you want access to, but do not want to expose to everybody. Servers, by definition, are implemented as a means of providing services and making applications and resources accessible to users. You can use the search functionality at the top of the page to find a more recent version. If available, we strongly recommend using a guide written for the version of Ubuntu you are using. This guide might still be useful as a reference, but may not work on other Ubuntu releases. Reason: Ubuntu 12.04 reached end of life (EOL) on Apand no longer receives security patches or updates. ![]() Migrate the server data to a supported version.Upgrade from Ubuntu 14.04 to Ubuntu 16.04.If you are currently operate a server running Ubuntu 12.04, we highly recommend upgrading or migrating to a supported version of Ubuntu: This article covers a version of Ubuntu that is no longer supported.
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