A ping flood is an attempt at a denial of service attack, because it floods both incoming and outgoing traffic - incoming pings and outgoing replies. Look back at the ping flood example in Figure 6. Service detection performed. Please report any incorrect results at In the example below, the target system is 192.168.1.68, but you can just as easily use a generic 192.168.1.0/24 to scan the entire range of a subnet. Chances are good that the source address is spoofed if it’s a real attacker.Ĭonversely, how would you like to see who on your network might be using Wireshark or a similar tool to sniff network traffic? Well, you can do that with NMAP. 81 address will determine whether this is a friendly sweep or a malicious reconnaissance probe. Depending on who owns the system with the. The originating IP address, 192.168.1.81 in this case, is the probing system.
In Wireshark, these types of scans are obvious. NMAP sends these packets to find out which ports on a remote system are open. Most Dropbox users don’t realize that this service gives them away on a network, because the LAN sync Discovery Protocol looks for other systems to sync with on the local network.įigure 8: Wireshark screenshot of a remote system port scan. On this small network, I know that my wife’s computer has Dropbox installed and that LAN sync is activated. Look for an entry in Figure 7 that displays the following line Dropbox LAN sync Discovery ProtocolĪnd check the associated IP address. You want to find users who use non-approved cloud applications like Dropbox, because they can be used for exfiltrating data from the network. In either case, here are a few ways that system administrators use Wireshark. It’s also true that many system administrators lead a double life as security administrators on smaller networks and in certain specialized workgroups on larger ones. It’s true that Wireshark is a security tool, but you can also use it as a pure system administration tool as well.
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