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Hey, welcome back to this video.

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So in this video, we're going to see how you can perform a search.

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Now, a search is used to do a remote login into another host device or, in simple words, another

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Linux operating system.

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All right.

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So let's see how to do it.

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So in this lesson, we are going to perform three different ways to do a search.

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So let's quickly begin with.

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Now, as you can see on the screen, this is my OS number one or host one, which is the Mac OS.

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And I also have my second OS, which is the host two, which is the pirate OS.

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Perfect.

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So now I'm going to log in into my parrot OS, which is this operating system from my host one, which

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is the Mac operating system.

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Now let me quickly see the IP address of this device to home, which we are going to log in and you

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can see the IP was one 92.1 60 8.0. 69.

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Now to log in into the remote device, we are going to use the command, which is SSH and the IP address

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of the remote host, which is the host to in our case, which is our parrot operating system.

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Now, once we give the IP address, we simply need to hit enter and we can see it will by default give

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route at the rate the IP address and it is asking for a password prompt.

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Now it is by default trying as to login into the default user, which is Rohit.

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Now.

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Once I give the correct password, I will be able to successfully login into the operating system.

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As you can see, Rohit added Parrot and I'm successfully logged in into the remote OS and I can control

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the whole operating system from here.

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Perfect.

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Now let me simply exit from here, which is basically log out and the connection gets closed.

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So we have seen the first way, which was simply a search and the IP address of the remote host.

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Now.

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In case you need to log in through a specific user.

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Only in our first case it was Rohit.

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But let's say I want to log in using an admin user.

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So for that you can simply specify the name of the user, add the rate, the IP address of the remote

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host.

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So as you can see as a such admin, add the rate IP address of the remote host where we want to log

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in, just specify the password and you will be able to log into the remote machine.

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As you can see, I have successfully logged in now I have typed the command, which is who am I to confirm?

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And you can see the user which has successfully logged in as admin.

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Perfect.

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So this was our second way to do a search using a username.

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Now let us see the third way in which we are going to search into the remote host using the default

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port number.

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Now we always know that search uses the default port, which is port 22, which you can specify using

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the flag hyphen P, which stands for the port number and the port number is 22.

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Now I will simply hit enter and it will ask me for a password prompt and I will specify the password

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and you can see I have successfully logged in into the machine.

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Now let us do one thing.

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Let's try to change the port number.

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This is basically a configuration which is done many times by sysadmins wherein they do not want some

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random persons to try to do a search login.

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That is the main reason they most of the times change the port numbers of these services like SSH.

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So by default no other random people are trying to brute force the search logins.

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So let's see how to change the port number.

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It is through the ssh configuration file.

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So nano slash etsy slash search slash search d config.

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And here you can see I have modified the port number and I have written it as Port 69 and I'm just going

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to save the file.

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Now, remember, once you have modified the configuration file, you need to restart the SSH service

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for which the command is surface ssh restart.

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Once we do that, our search changes get replicated into the system.

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Now let's quickly see the status of the service if it is running fine and our changes have been modified

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or reflected or no.

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So let us just confirm that the search server has started on Port 69 or no?

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Or is it still running on 22?

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So just hit status and you can see it is active running and the new port number is 69, as we can see

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over here.

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Perfect.

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Now our set server has configured correctly on our new port.

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So now let us try to log in again.

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But this time when we try to log in into the port 22, you can see we get an error which is connection

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refused because we know that SSH is not running on the default port, which is 22.

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Now, does it say connection refuse?

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The port is not accepting any connections and we know that we have just now modified the port number

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and the new port number is six nine.

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So let us try to connect onto our new port that is six nine and hit enter and you can see it immediately

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gave a prompt to give the password.

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When the user gives the right password, he is able to successfully log in and you can see who am I

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say is the user which is currently logged in as admin.

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So I hope you guys understood how you can do a search to the host.

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You can do a search using the second method that was using the name of the host, and the third way

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was using the port number in case the SSH service is not running on the default port.

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I hope you guys understood.

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Thank you.