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Complete Linux Networking Tutorial

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In this video we’re not going to be doing anything, we’re not gonna be learning about networking specifically on Linux. We need to understand a few general concepts before we get to that. So, this video is going to be a sort of introduction to networking on Linux. An introduction to networking in general. So, right now you are on a computerized device watching this video which is on the Internet. And the way that’s happening is basically you’re connected to a router, or a modem router all-in-one device, and the router is connected to your internet service provider, and your internet service provider has devices that are connected to the bigger world of the internet. So, you send a request, if you open up a browser and type in google.com and then hit enter, your web browser sends that as a request. It’s basically saying okay this is the web page that this computer wants to look at right now. It sends that through your router, which sends it to your internet service provider, and your internet service provider has all these fancy computers that properly route certain requests to DNS servers, any requests actually. What a DNS server does is it says okay, you gave me this string of text, a domain name or URL, and I have a record here that shows this domain or string of texts is supposed to serve up the content at this IP address. And so how the internet works is it doesn’t understand Google.com or Facebook.com. The internet uses network addresses, right, and so think of it like each web server, each server out there has and address just like every house on your street has an address. So, if you were gonna send somebody down the street to Joe’s place, you would say okay well go to this address, then you would give them the address of Joe’s place and they would be able to find it. The same thing is happening on a DNS server. You give the DNS server a domain name that you want to look at, and then th the DNS server takes that and says okay well I know this domain name is supposed to route to this IP address. So, you request, you need to go over to the server to get that content, and so your request then gets translated to an IP address and other information, and it gets to the web server that it’s supposed to be at. And then the web server running Apache or anything really nginx, I’m sure there’s tons out there that I don’t know about, but the web server receives requests, it receives all of the information related to it. So, cookies you know session variable stuff like that as well as the exact item you want to look at it. So, if you go to website.com/something /something else, everything after the .com/ is called a URI and that indicates what piece of content on the server you want. So, think of the first part domain.com as what server you need to be communicating with, and then afterwards you know /about.php or something that’s gonna tell the server once it gets the request what page it needs to send you. And then it does it’s you know rendering process and it sends you that page in the exact same route that your request took to get there. So, it’s like when you send your friend down the street to Joe’s place to pick up a box of pizza. So, your friend walks down the street he turns left you know maybe turns right, he gets to Joe’s place, he walks in says hey I need to get a pizza, Joe gives him the pizza, then he walks same way back to your house, and before you know it a web page has loaded within your computer box. That’s how that happens. I hope you guys understood that. In the next video we’re actually gonna cover a few more concepts before we dive into you know really understanding to the point that we can use applications to do certain things. So, I hope you guys found that informative. If you didn’t, if there’s any point in this video that you felt lost, or confused, or even that I was just rambling, or even if you just want to tell me you know a few more web server applications aside from Apache, there is a comment section to the side of this video. You just leave a comment I will reply and get you whatever information you need, and hopefully this will make sense to you. So, in the last video we described how the internet works, what the internet is, is technically an interconnected collection of networks. So, all these little networks all over the world can now be connected to other networks in the world, and so we have the internet which is just that. So, to understand the network here we’re bringing it down from you know the top level stuff, down to a more localized thing. And so a local network is the type of network that you have set up in your house, where you connect to the router, the router then you know can interact with the internet for you, and then return the information to you computer. Now, I wanted to talk for a moment about IP addresses and the current issues that face them, while still using ipv4. So, let’s open up a document here. So, an IP address looks like this. This is an IP address of a server somewhere, probably, if you put this in your browser…actually let’s try. That was just a random one that I just wrote up, let’s see what happens. This is probably the address of somebody, somebody you know, somebody is connected to an internet service provider and they get one IP address for all their computers, and the reason why that happens is because these IP addresses can go from 1.1.1.1 all the way to 255. So, as you can imagine the range is pretty big but it’s not quite big enough for the human population, and so we’ve been running out of IP addresses for the last fifteen or twenty years. And, multiple solutions have been brought into the equation to try and solve this problem. One of them was called a NAT. What this is is a network address. Basically, you have one router you have one IP address. So, the IP address you have let’s say is this one up here at the top, this is your IP address that the internet service provider has given you. Without the use of a router you can plug one device into the modem and your computer will use this IP address in requests, so basically when you send a request to google.com to load a page or to load a search what happens is your IP address gets sent to Google as well so that Google can return this data to your device. But, what happens when you only have one IP address and seven computers, that’s when the NAT comes into play. So, this IP address now is the IP address of your modem or router, and it assigns NAT addresses to all the devices on your network. So, let’s say you just have two devices on the network. The first one, actually the IP address of your actual router is likely this. I’ve seen one instance where a network did not use this IP address as its routers IP address. The IP addresses that your router will assign to computers in your home all begin with 192. So, basically it would be something like that, right, that would be the IP address, actually hold up I got this wrong. This is the IP address of your router, this is the IP address of your first computer. So, it always begins with 192.168 Your second computer might be this, and your 3rd computer might be this. So, now you have three IP addresses, three devices on your network and your router here is keeping track of them. So, from this device I type google.com into the address bar, what happens is this IP address along with the request gets sent to my router, the router then sends the request off to the ISP and then over to the internet and stuff, with the IP address of the router which internally is this and externally this is our ISP IP address they gave us. So, what happens this gets sent to google.com, google.com sends the page back to this IP address connected to the router here, the router then takes that request and connects it with the device that requested it, and then it sends it back to that device. And so that’s how a router interfaces between a local network and the internet. So, in the olden days before the NAT address and routers really took off each one of these computers would have had a different IP address, so it would have looked something like this. So, that would have been 3 actual IP addresses when we found a way that you actually only need one IP address for our network, and so that’s what a router does and so these IP addresses are local and you’re gonna see these in terminal. Now, one other special IP address is 127.0.0.1 On every computer this means this computer. It’s basically a self identifying IP address. If I were to type this into my browser I would see my localhost, where if you put this in your browser you would see your localhost. The NAT IP address basically works the same way. So, if I were to go to 192.168.0.3 it would try to find a computer only on my network that has this address and then connect to it. So, that’s how a router works, in the next video we’re getting into the ifconfig. On Windows you have an ipconfig command, on Linux here you’ve got ifconfig and we’re gonna cover that in the next video, and a a few other commands as well. So, thank you guys so much for watching, and I’ll see you guys soon.

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How to Setup an SSH Host on Your Local Machine

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So, the last video that we’re doing is setting up an SSH host on our local machine, and it’s really simple. So, let’s go ahead and open up terminal. We need to install openssh-server. So, go ahead and run “sudo apt-get install openssh-server” I believe it is. We’ll get an error message if that’s not it’s been awhile since I did this, so. Once we have it installed you’re basically good to go, however we are going to make it a little more secure. We’re gonna change the port that this runs on and so there is an SSH deconfig file now. Let’s go ahead and run “sudo nano /etc/ssh/ssd_config” So, we can go ahead and make this more secure by changing the port and also changing the authentication stuff. So, let’s go ahead and change the port to 2212 instead of the default 22, and then we’re going to scroll down here a bit, and under authentication here we’re going to change permit root login to no, so nobody’s gonna be able to login as root. Scroll down a bit here as well, and we’re going to add a line this is allow users, and this is going to take basically a list of usernames of users who are allowed to log in through SSH. So, I’m going to make my user account able to login through SSH and this is going to restrict all other users from connecting to this machine via SSH. So, I’m going to save it and exit, gonna clear this up, and then what we need to do is restart the SSH service. So, run “sudo systemctl restart ssh” and you’re good to go. And so now if I were on a different machine here, actually let’s see if I can get my external IP address here, I don’t think I can get it through here, no. Alright, clear this. I’m gonna open up network-tools and I’m gonna do something like if you guys have seen the movie Inception, this concept that I’m about to do will feel a little little bit familiar to you. This by the way when you go to network-tools.com the IP address that pops into the input field by default is your external your public facing IP address. This is the IP address that your internet service provider gives to you. Now, actually in order for this to work, this would have to be the only machine or I would have to set up through the router DMOZ port forwarding or a host forwarding, but what we can try, we’re gonna try it anyway. I’m going to
“ssh [email protected]” and then from here I’m going to ssh into this machine. It probably won’t forward that port. So, I would have to go through my router at this point to configure port forwarding for that port 2212 in order to be able to connect from an external host to this host. If you only have one machine, so basically like the IP address of my server when I, when I go to the IP address, it goes directly to my server. It’s not configured through NAT addresses my server actually has five IP addresses, and those IP addresses go directly to my server, and that’s why I can access SSH on that server without having to configure any routers or anything. I think actually the server provider manage that in some way. So, anyway you know if I were to go into my router and configure DMOZ or port forwarding, what I was just doing would in fact work. So, thank you guys so much for watching, and I will see you guys again soon.

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How to Transfer Files Between 2 Computers Using SFTP

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Hey guys, let’s go over some SFTP. So, first what is SSTP? Well first before we answer that question, let’s ask a similar but different question, what is FTP? FTP is an acronym for the term file transfer protocol and it uses the port 21, and basically what it does is it transfers files between two machines. So, SFTP, because in regular FTP everything is transferred in clear text, so if anybody is sniffing packets on your network like we learned in a previous video, they would be able to read all those packets, basically. So, we’re not going to use FTP, I actually recommend never use FTP. SFTP is just easier anyway, and so we’re just going to use SFTP. So, similarly to the “ssh” command, you’re gonna write “sftp” and then the connection string. So, in my case it’s exactly the same as before. Then it asks for my password for the remote host, so I’m gonna put that in here, and now I can list what’s on the remote host by typing “ls” but we also have a few different commands to list what’s on the local host. I’m actually gonna exit here. I’m going to make a directory called “sftp-demo” I’m going to change into sftp-demo, and I’m going to “touch” a file called “names.txt.” Now, I’m going to reconnect while in this directory, to my server. Now, if I run “ls” I get the remote directories current directory listing, if I type “lls” I get the local listing of the directory that I’m in on the local host. And so here we can actually, we can grab files and transfer them to and from both machines. So, if I wanted to put names.text on to the server in the current directory, what I would do is type “put names.txt” and it’s going to upload it to my remote host with the same name. So, that’s when you would use “put” if you want to push a file from from your local machine to the remote host. Similarly, use the command “get” to get files. So, I’m going to, I really don’t recall any of these files, I’m just gonna get the composer.json file. So, I’m going to type “get composer.json” and if I run “lls” on my local machine I can now see that I have that file there. So, if I exit and then run “ls” I’ve got that file there. So, that is how you would use SFTP to transfer files to and from machines, and also a few commands there that can help you see what files are available. So, thank you guys so much for watching, and I will see you guys again soon.

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Using SSH to Access the Command Line of a Remote Host

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Hey guys, in this video it’s all about SSH. So, first what is SSH? It’s an abbreviation that stands for Secure Shell and it basically allows you to access the shell or the command line of a remote host that has an SSH server setup. So, in one of the previous videos I connected via SSH to my own server and so I’m gonna do that again, and I’m going to explain exactly what I’m doing as I’m doing it. So, the way to get connected to a remote host through command line is using the “ssh” command, and then the only argument it’s gonna take is the connection string. So, in this case it’s my username on my remote host at, and then the remote host. So, I can use this or any other domain name that points to that server or I could use the server’s IP address, and when I hit enter it’s gonna ask for my password on that machine, so I’m gonna put it in and you’re gonna see that the prompt is gonna change. I’ve actually got this machine named the exact same thing is I have my server name, so it’s nick@voltron here, and I’m on my local machine. So, if I were to go to “var/www/html” and then run the “ls” command, I’m gonna see that I’ve got a lot of directories here actually, and a lot of these are actually unused and old projects that I worked on. But, anyway, basically once you get connected all the commands are the exact same because it’s essentially just a remote Linux shell. So, I could return to my home directory, then list those files, and you’ll see that again I’ve got just a bunch of random files. So, that is how to connect to SSH, when you’re done just type exit the connection will be closed. So, that was a really short video just to recap how to get connected is type “ssh” your remote user name at the name of the remote host, and hit enter and its gonna ask for your password. So, thank you guys for watching this video. In the next video we are going to be going over some SFTP, which is a bit bigger.

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How to Scan External Host Names & IP Addresses using Nmap

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So, now you don’t only have to scan devices on your local network, you can
also scan external IP addresses or host names. So, I’m going to scan my server here by typing “nmap pointybracket.net” and then the host name of my server. It’s gonna take a moment and I’ve got a lot of open ports just because I have so many different things running. I’ve got, there’s a lot of things that run on it and some things that I just setup that I’ve never really used and haven’t bothered to shut them down, and so what we get here is my host and we can see that I’ve got FTP, SSH, SMTP, we’ve got the standard domain in HTTP, pop3, there’s a bunch of stuff here and I’m not going to go into what all those are but we can see that these are everything that the server has. You can also set a file, so let me clear this. Let’s open up gedit. So, we’re going to create a file of of hosts that we want to regularly scan and this can save time when we scan them if you’ve got like you know a few hosts that you regularly check on. So, I’m going to put “pointybracket.net” “192.168.0.1” and “192.168.0.100” and I’m gonna save this as “networks.txt” So, what we can do there is we can type “nmap -iL -/networks.txt.” so it’s a lowercase “i” and a capital “L” and then the location of that file, so it was “networks.txt” in my home directory. This is going to scan each of the hosts that is in that networks file. It returns in the order that they were scanned in, so that’s pretty neat. I want to go over a few more things with you guys regarding this command it does get pretty big there’s so much so that you can do with this, and so I really urge you guys to go and explore this if networking is one of your interests, if you want to really you know follow that. One of the things I want to show you guys is how we can turn on OS inversion detection during the scan, and so what we’re going to do is type “nmap -A 192.168.0-100” and this is going to scan, oh I had a little typo in the IP address there so I had just fix that, so this should tell me the operating system versions that are running on the devices on my network, and you can also find this information about other hosts. Aside from this, just while this is running you can scan aa network and find out which servers and devices are up and running by using the flag “-sP” You can display the reason that a port is in a particular state by having the flag “–reason” You can choose to only show opened ports which appears to be the default functionality here, it doesn’t show the closed ports. You can actually also show all of the host interfaces for a machine by typing “–iflist” in the list of arguments for this command, and I mean again it’s really big so go ahead and look this up. If you wanna type in google.com “nmap commands” there’s a bunch of different ones that you guys should play around with, this was more of an introduction onto the most common or basic functionalities of this program. I’m going to cancel this here and I’m just going to restart. This will go a bit faster, I’m just going to target my own IP address here so we can get this done and you guys can see the example output that this is gonna do when adding the “-A” slag in here. So, here you can see a lot of information about this machine. Let’s go to the top here. We’ve got the port, the state, and the service, as well as the version of the service. So, I have Apache 2.4.12 installed and that’s also the same one here. If we go down we get more information about the host cell, so we have OS UNIX, we’ve got the computer name, the domain name if anything is configured, the fully qualified domain name, and just a lot more information. So, that is the nmap command and it would be useful if you’re trying to just scan your network, and one of the examples that comes off the top of my head that would be you know when I would use command is if I noticed that the internet’s you know running a bit slow. Let’s say I’ve got 10 people in my house and half of them may or may not be using the internet and I wanna see how many people are online, this is what I would do in that instance or if you you know if you want to check how many machines offer a certain service, or what the IP address is that you need to use to access a certain service on another machine, this would help you figure that out. So, thank you guys for watching this video, I will see you guys again soon.

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Linux Host File Explained

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Alright, so I just had to restart Firefox here. This is the default server page, the route page for my server, if were gonna “server.pointingbracket.net” and actually get the exact same page, and so what I can do I believe is access the routes on the server as normal and it works. So, what we’re doing as you can see is we’re just, we’re just setting DNS records internally for this machine that it looks at before it goes at you the correct DNS information. So, again I’m gonna go to network-tools. We’re going to try with like, let’s try and find Joe’s Pizza, a
website for them, there we go. So let’s see if this works. This is the IP address I’m getting. So, I’m going to check if that IP address will route to the website as well. No, but it routes to this page. This is the page we should see after we paste this in to our hosts file. Let’s go ahead and save, and then let’s go to “go/” Close this, and there we go. And you can see how this works is basically it routes to whatever we want to route to. So, you could create shortcuts for your favorite websites with the exception of Google, Google does a lot of internal routing and stuff. Sometimes this will work, sometimes it wont. It all depends on how the web server is setup. Usually though I just use the hosts file to set domains to go to my localhost, and that’s for when I’m developing something that a URL needs to be set with. So, if I’m developing a WordPress site on my local machine and I need to set up a URL in the WordPress configuration, I would configure a domain and then point it to my localhost. So, that is the hosts file. Let’s exit out of here, close this, clear that. So, now our hostname. A hostname is basically a name of a machine, and in this instance ours is called Voltron and we can see that because we’ve got this right here. So, you can use the hostname much like the same way you can use you know custom hosts that you set, so I can just go to Voltron and its gonna route to my Apache default page. Now, you can also update the hostname and we need to do a couple things in order to do that. So, first we’re gonna run the command “sudo hostnamectl set-hostname and whatever host we want to name it to. So, “Megazord” Now we need to edit the hosts file to update our host name here as well. So, we’re going to replace “Voltron” with “Megazord” and save this and close it, and we’re gonna run “sudo service hostname restart” It said it failed to restart the hostname service, but it looks like it’s working hostname is now set to Megazord, and if I were to close the browser and reopen it I should be able to go to Megazord/ and it does in fact redirect me to my default Apache 2 page. And so that’s what a host name is and how to change it on Ubuntu, you can also change it through the system settings but we’re not going to go through a GUI way to do this right now. So, thanks for watching I hope you guys found this informative. If you have any questions just leave a comment, otherwise I’ll see you guys soon.

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What is the Linux Host File?

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Hey guys, in this video we’re going to talk about hosts briefly, so in terms of our local host actually. So, there’s two parts to this video, the first we’re going to cover is the hosts file and we briefly touched on that in a previous video I think when we were, when we were deploying I think our Meteor application with Apache 2. We went into our hosts file to create some routes for the, for the application. So, basically the host file is in “/etc/hosts” so we can go ahead and open that up just type “sudo nano /etc/hosts” and hit enter. Put in your password and this is our hosts file. So, we actually did we were in here for app.localhost, subdomain in python, so the virtual hosts, and Python deployment, and Meteor deployment we were in here, and I didn’t really explain to what extent you can use this file. So, as I explained in the networking introduction video, a DNS server basically hold records of what domains point to what IP addresses. Think of this file as an internal DNS lookup functionality. So, when I go to apt.localhost the first place my computer checks for a route is the hosts file. If it doesn’t find an entry for a domain in the hosts file, then it goes out to the router, and then your ISP, and then a DNS server, and it checks there if there’s any records for it. So, by adding entries here we can actually override default behavior of known domains that we want to change. So, what I’m going to do is open up Firefox here for a moment, and I’m going to go to a website that will allow us to get the IP address of google.com, because we’re going to be using that. Just gonna go to network-tools.com and I’m gonna type in here google.com, and we can see that this IP address is the one we’re looking for. So, I’m going to copy this here and I’m gonna jump back into this file. Now, this file can take three columns and we’ve only discussed two so far, so let’s go ahead and cover all the columns here in great detail. So, the first one is the IP address that we want a route to. The second column is gonna be the domain or the host’s name that we want to route to that. So, let’s just type in go.com and then the third column is an alias, so we can just type “go”. And, so when we save this file what we’re gonna is when we go to go, it’s going to go to google.com and their their servers have actually, their not ok so they’re doing a lot of internal routing there. Let’s try YouTube. So, what we’re gonna do again, we’re gonna get actually let’s try something that we know is going to work. So, I’m just gonna type in my own server name here, and grab that IP address, jump back into our hosts file, and I’m gonna paste that there. Now I’m gonna save this again and go to go.com. It’s saying it’s not found, weird this just worked.

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What is a Local Area Network (LAN)?

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So, in the last video we described how the internet works, what the internet is, is technically an interconnected collection of networks. So, all these little networks all over the world can now be connected to other networks in the world, and so we have the internet which is just that. So, to understand the network here we’re bringing it down from you know the top level stuff, down to a more localized thing. And so a local network is the type of network that you have set up in your house, where you connect to the router, the router then you know can interact with the internet for you, and then return the information to you computer. Now, I wanted to talk for a moment about IP addresses and the current issues that face them, while still using ipv4. So, let’s open up a document here. So, an IP address looks like this. This is an IP address of a server somewhere, probably, if you put this in your browser…actually let’s try. That was just a random one that I just wrote up, let’s see what happens. This is probably the address of somebody, somebody you know, somebody is connected to an internet service provider and they get one IP address for all their computers, and the reason why that happens is because these IP addresses can go from 1.1.1.1 all the way to 255. So, as you can imagine the range is pretty big but it’s not quite big enough for the human population, and so we’ve been running out of IP addresses for the last fifteen or twenty years. And, multiple solutions have been brought into the equation to try and solve this problem. One of them was called a NAT. What this is is a network address. Basically, you have one router you have one IP address. So, the IP address you have let’s say is this one up here at the top, this is your IP address that the internet service provider has given you. Without the use of a router you can plug one device into the modem and your computer will use this IP address in requests, so basically when you send a request to google.com to load a page or to load a search what happens is your IP address gets sent to Google as well so that Google can return this data to your device. But, what happens when you only have one IP address and seven computers, that’s when the NAT comes into play. So, this IP address now is the IP address of your modem or router, and it assigns NAT addresses to all the devices on your network. So, let’s say you just have two devices on the network. The first one, actually the IP address of your actual router is likely this. I’ve seen one instance where a network did not use this IP address as its routers IP address. The IP addresses that your router will assign to computers in your home all begin with 192. So, basically it would be something like that, right, that would be the IP address, actually hold up I got this wrong. This is the IP address of your router, this is the IP address of your first computer. So, it always begins with 192.168 Your second computer might be this, and your 3rd computer might be this. So, now you have three IP addresses, three devices on your network and your router here is keeping track of them. So, from this device I type google.com into the address bar, what happens is this IP address along with the request gets sent to my router, the router then sends the request off to the ISP and then over to the internet and stuff, with the IP address of the router which internally is this and externally this is our ISP IP address they gave us. So, what happens this gets sent to google.com, google.com sends the page back to this IP address connected to the router here, the router then takes that request and connects it with the device that requested it, and then it sends it back to that device. And so that’s how a router interfaces between a local network and the internet. So, in the olden days before the NAT address and routers really took off each one of these computers would have had a different IP address, so it would have looked something like this. So, that would have been 3 actual IP addresses when we found a way that you actually only need one IP address for our network, and so that’s what a router does and so these IP addresses are local and you’re gonna see these in terminal. Now, one other special IP address is 127.0.0.1 On every computer this means this computer. It’s basically a self identifying IP address. If I were to type this into my browser I would see my localhost, where if you put this in your browser you would see your localhost. The NAT IP address basically works the same way. So, if I were to go to 192.168.0.3 it would try to find a computer only on my network that has this address and then connect to it. So, that’s how a router works, in the next video we’re getting into the ifconfig. On Windows you have an ipconfig command, on Linux here you’ve got ifconfig and we’re gonna cover that in the next video, and a a few other commands as well. So, thank you guys so much for watching, and I’ll see you guys soon.

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Introduction to Networking on Linux

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So, we’re all done with the user accounts and groups and stuff and we’re gonna move on to networking. Networking is a big topic in and of itself, and so there’s no humanly way possible I’d be able to teach you everything there is to know about networking, and I don’t plan to. What I plan to do is give you guys the most essential and necessary information about networking and then take that as you want and you know further development, but this should be a starting point for you. It should help you understand what’s actually happening on a network, and even what network is. So, for people new to I guess computers, technology, and maybe not new but maybe you’ve used the internet before and you just haven’t thought about you know what’s actually happening, and that’s how I was for a long time actually. I had worked with an internet service provider and before I worked there I just though you know the internet was magic. That you know I opened up a web browser and type in a series of letters you know separated by a few dots that somehow, magically, I didn’t really care how it happened at that point it went out and found a page. You know magically brought it to my computer, and so if that’s the kind of understanding you guys have at this point this is going to be some really great information for you guys to take and really absorb.