Snort will look at all ports on the protected network. We are using the HOME_NET value from the nf file. Snort will generate an alert when the set condition is met. Let’s walk through the syntax of this rule: Scroll up until you see “0 Snort rules read” (see the image below). Here we are telling Snort to test ( -T ) the configuration file ( -c points to its location) on the eth0 interface (enter your interface value if it’s different). Except, it doesn’t have any rules loaded. Select Save from the bar on top and close the file. You’ll simply change the IP address part to match your Ubuntu Server VM IP, making sure to leave the “.0/24 ″ on the end. You’ll want to change the IP address to be your actual class C subnet. When the nf file opens, scroll down until you find the ipvar HOME_NET setting. Next, type the following command to open the snort configuration file in gedit text editor:Įnter the password for Ubuntu Server.
See the image below (your IP may be different). Note the IP address and the network interface value. First, enter ifconfig in your terminal shell to see the network configuration. Next, we need to configure our HOME_NET value: the network we will be protecting. To verify the Snort version, type in snort -V and hit Enter. (Alternatively, you can press Ctrl+Alt+T to open a new shell.) Launch your Ubuntu Server VM, log on with credentials provided at the beginning of this guide and open a terminal shell by double-clicking the Desktop shortcut. You have Snort version 2.9.8 installed on your Ubuntu Server VM.
We’ll be using the Ubuntu Server VM, the Windows Server 2012 R2 VM and the Kali Linux VM for this lab. We are going to be using Snort in this part of the lab in IDS mode, then later use it as a packet logger. Snort can essentially run in three different modes: IDS mode, logging mode and sniffer mode. It should also be mentioned that Sourcefire was acquired by Cisco in early October 2013. With millions of downloads and nearly 400,000 registered users, Snort has become the de facto standard for IPS.” Combining the benefits of signature, protocol, and anomaly-based inspection, Snort is the most widely deployed IDS/IPS technology worldwide. “Snort® is an open source network intrusion prevention and detection system (IDS/IPS) developed by Sourcefire.
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