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Nmap Install & how to get Started

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Hey guys, welcome back. This is the last video in the networking module. I just want to give you guys the tools you need to further your knowledge of networking in general, and how networking tasks would be performed on Linux. So, there is one more tool that I want to introduce you guys to called “nmap” So, nmap is an abbreviation for the term network mapper, and it’s an open source tool that can tell you what devices are on the network, what IP addresses are in use, and what services each machine is offering. So, let’s go ahead we need to install the tools so let’s run “sudo apt-get install nmap” and it’s going to download about 3 megabytes of data and it’s going to expand to 18 megabytes. Alright, now that this is installed the way we’re going to use this is by simply typing and “nmap” and then we can do a bunch of things after this. So, the first thing we’re gonna cover is how to scan specific IP address, so I wanna get the IP address that I have so I’m gonna run “ifconfig” So, “nmap and we can see what ports are open, well we can see what ports are available, their state, and then also the service that they provide by name. So, I have Apache installed on this machine, you guys should have it installed on yours as well, if you went through the Apache videos and so you should see the same
thing here. And so the port is 80, the state is opened because we’ve got we’ve got Apache running right now, it automatically runs when start up the machine, and the service that the port provides is http. So, if I were also running an SSH server on this machine you would see another entry in this list for port 22, it would say state open, and service SSH or something to that effect. Now, if we want more information we can run “nmap -v” then the IP address again, so “” “-v” means verbose and what verbos mode does in most applications is it also, aside from the regular output, it also gives you more direction on what’s happening in the application or provides more information than you would normally get, so in this instance we see that it’s doing a bunch of scans. It scans the IP address then for 1,000 ports and it finds all these ports that are open, and then also finds a bunch of a bunch of closed ports listed here, closed ports, and it it gives us the same output as before. So, that’s neat, I only have one device on my network actually except for my router. Now, my router I believe is So, that is the IP address for my router, so what we can do is scan multiple IP addresses at a time in multiple ways. So, the first way that we’re gonna do is by specifying each IP address. So, let’s go ahead and run “nmap 192.168.0.” and then we’re going to add the last values in here separated by comma. So, first I’m going to scan my machine as well as the router and if I had a network address of I could also do that, but I don’t so I’m not going to. Now, what we see here would be my router. We can see this is the IP address for it and this is what services it offers on which ports, and then we get my machine right here that provides the same output as it does before but this is how it would output multiple machines scan results. Now, you can also scan a range of IP address. So, let’s go ahead and run nmap command again this is gonna go from 1 all the way to a 100 and it’s gonna scan all IP addresses within that range, so if I had a bunch of machines on my network, which I actually do I have my phone on that network as well, and that’s it actually so I’ve my router, my computer, and my phone. My phone is not coming up so I’m not doing anything on my computer right at the moment, I’m just checking what IP address I have on my phone here, if I can find out how. Ok, so the IP address on my phone is .101, so I’m what gonna do is run the previous command and just have it scan from 1-101. We should see three machines come up, I don’t think my phone has any services or open ports that it would list, but let’s have a look here. And when you scan multiple IP addresses the more you ,the longer it takes. Okay, so there’s nothing available from my phone coming up. Now, you can also scan, so when we talked about IP addresses we discovered that you can use anything from 0 to 255. So, if I were to want to scan all IP addresses that begin with 192.168.0, I could then put this in here, right, but rather than doing that we can actually use a wild card here. And, I’m actually gonna cancel this because it’s gonna take a while.