Security

The security of our routers and smart switches, which form the backbone of our network, has an important place. For this, how to block certain IP addresses and ports from Firewall, our previous articles have already explained. Now, I will tell you that apart from the firewall, there should also be other settings that we need to make.

First of all, we need to turn off the services we use. If we can change the services we use, let’s change them. For this, we make the necessary settings from the Ip>service tab as seen in the picture below.

It is very important for us to leave out the ports and services that we do not use to create our network security with the Mikrotik router. In this article, we first connect to the Mikrotik Firewall Ip and Port Banning method with the winbox application to see how to do it.

From here;
From the Ip / Firewall menu, we go to the Filter Rules tab.

We add a new rule by pressing the + button.

Pfsense is a BSD-based software firewall. The product generally has many useful features such as msn or program banning, web content filtering, user restriction, and VPN. Now let’s look at the answer to the question of what is PfSense.

What is Pfsense?

Pfsense is an open-source firewall/router, FreeBSD software distribution. FreeBSD consists of the open-source codes of the Research Unix of AT&T, which is considered to be the ancestor of UNIX. It has a Web interface for configuration. You can easily install it on any computer or server.

SQL injection is a web security vulnerability that replaces the OWASP (Open Web Application Security Project) Top 10 every year. In shortly, SQL injection is caused by the fact that the data from the user is directly included in the SQL query.

In the example below, there is a simple login page written in asp language.

         FUsername = Request.Form("username")
         FPassword = Request.Form("password")

               Set RsLogin = SQLConn.Execute("SELECT * FROM Members WHERE username =      '" & FUsername & "' AND Password = '" & FPassword & "'")

         If RsLogin.EOF AND RsLogin.BOF Then
                Response.Redirect "/error.asp"

         Else
               Session("login") = RsLogin("user_id")
             Response.Redirect "../"

         End If

Let’s examine this code.

In this article, we will see how to reset the root password of our Linux operating systems. This will be useful if we forget or do not know the password of our operating system.
Of course, we need to be physically next to our server for this process. That’s why we have to care about the physical security of my servers in order not to hack our servers.

1. As a first step, if our system is on, we shut it down and when starting again we press any key of the keyboard and enter our boot options.