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Pink scans are a valuable method for determining if a host is online and responsive.

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While traditional TCP ping scans are commonly used, UDP ping scans offers an advantage by being able

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to detect systems behind firewalls with strict TCP filtering, but have left UDP exposed.

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In this lecture we will explore how to perform a UDP ping scan using Nmap and its related options.

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So let's initiate a UDP ping scan.

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You will open your terminal here and let's clear that.

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So now we will enter the nmap as n here pu here with po option, with uppercase here.

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And after that we will enter the code silicon.

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And here, as you can see here, only works if you are root.

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So we will use the sudo here.

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Sudo enter the password and that's it.

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So here this command instructs nmap to perform host discovery using udp ping scanning.

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And here let's take another look by scanning the target scan me.nmap.org here.

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So we will delete the code Silicom and scan me.

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Scan me.nmap.org here.

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So now we are scanning scan me dot.

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Dot org.

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And as you can see here there is zero host is up here because host seems um so if it is really up with

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blocking our pink props and here as you can see here in my password gives it gives us an suggestion

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here so.

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Now, as you can see here, host is up and other addresses for scan me which are not scanned.

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This is the IPV IP version six address here.

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So after executing this command Nmap provider scan report indicating whether the target is host is online,

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Additionally, it might display alternative IP addresses associated with the target, for instance,

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this year.

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So we will also test it with the code Silicom code Silicom here and now what we're going to see is and

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as you can see here, we have our address here, address and so on.

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So let's actually think about how it works.

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So UDP ping scanning operates by sending an empty UDP packet to the target port.

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If the host is online, it should respond with an ICMP port unreachable error.

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On the other hand, if the host is offline, various ICMP ICMP messages may be returned.

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So we will try that again and we will enter some weird.

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Here.

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Most.

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Here and now.

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No targets are specified and so on.

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So because it couldn't resolve this.

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So we will we can give 111 here and in this case.

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And as you can see, it is cost is down.

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So and it's worth noting that open ports that do not respond to empty UDP packets can generate false

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positives, as you can see here during the scan.

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So service is running on these ports might simply ignore the UDP packets leading to incorrect offline

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status for the host.

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And as you've seen in previous lectures in previous examples here.

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So when we entered this to console.com, the Encode cell in reality is actually up.

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So it's running.

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But here it's as you can see in set that it's down.

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So to improve the accuracy of the scan results, selecting closed ports as targets can be beneficial.

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So to specify the ports to be probed in UDP ping scans, you can add a port list or range after the

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p u option here.

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So we will delete the s n now because of that and after that we will after p u here without spaces,

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we will enter from 0 to 1500 here.

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So now it will scan the com port UDP port and send requests from one zero here and to 1500.

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So now we are waiting for it.

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And as you can see, it's almost done 17%, 13.

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1450.

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Almost 60 here.

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And here.

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So while this loading, we can go to another example here.

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So pink scans are commonly used to determine the online status of a host and ICMP echo request messages

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specifically designed for these purposes so and are employed in ICMP ping scans to reliably detect a

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host status.

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So in this lecture we will explore how to perform an ICMP ping scan using Nmap and flags associated

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with the different types of supported ICMP messages.

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So here, let's see the output here.

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And as you can see, it's almost done.

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And you see here we have open ports and services listed here and also our DNS record.

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So let's delete this and we will.

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We will execute another scan here and a map here and after that code.

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So now what we are doing here is we are initiating an ICMP ping scan.

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And here, as you can see here, using TCP mixer rather than ICMP.

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So that's why we need to run it with Sudo.

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And here we will get an output here, almost done.

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So this command instructs Nmap to send an ICMP echo request packet to the specified target.

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So here we will also do another example with the scan me.nmap.org.

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After initiating this and completing this scan here, it's almost done.

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Just a 20% left.

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And as you can see here, undergoing a scene stealth scan.

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And it's a stealth scan timing.

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It's 7% almost and done.

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And here we also got this.

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Here we have the DNS record again and so on.

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So we will Now what we're going to do is we will execute the same.

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Scan me scan me.nmap.org website and here.

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Upon executing the command, Nmap will provide a scan report indicating whether the host is responding

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as it did here.

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So additionally, it may display the latency and other relevant information.

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For example, this here and so on.

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So let's actually now let's go to think about how it works here.

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So the SDN.

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Here, the s, n, P or P option.

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These racks and map to send an ICMP echo request package to the target host.

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So if the host responds with an ICMP echo reply, we can determine that it is online.

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So by utilizing the this packet trace.

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Packet trace option, we can gain insights into underlying process here.

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And I have.

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I also have some additional insights to hear.

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So ICMP ping scanning supports various ICMP message types, although remote ICMP traffic is typically

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blocked, so it's commonly logged within local network.

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So to explore more ICMP ping scan configuration options, refer to the documentation and resources available

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for Nmap.

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And here we also have the local versus remote network.

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So it's important to keep in mind that while ICMP ping scans can be useful for monitoring local networks,

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remote ICMP packets are often blocked by system administrators, so therefore their effectiveness may

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vary depending on the other network configuration.

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And in addition to the ICMP echo request, the other ICMP messages can also be employed for host discovery

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and Nmap supports ICMP timestamp reply, which is uppercase p p here.

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So let's also try it p p here.

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And this is the address.

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And we also can use the address mask reply p m messages as alternative techniques.

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So these variations can bypass misconfigured firewalls that only block ICMP echo requests.

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So to perform the scans using these ICMP types, you can use this command, as you can see here, p

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p.

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So we will add the packet trace to see what's going on under the hood.

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And after that we will use the P here since we executed already here and now they're seeing.

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Uh, as you can see, host seems down because in this website we have a firewall and it also blocks

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this ICMP ping scan and different ICMP echo request here.