Update System_Configuration.md

Author: NextGenSec-Github

DFIR/Digital Forensics/Linux/System_Configuration.md

@@ -12,6 +12,31 @@ America/New_York
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 The information stored in the /etc/timezone file is typically used by system utilities and services to ensure that the system's time is displayed and interpreted correctly according to the specified time zone. It's important for accurate timekeeping and coordination across systems, especially in networked environments.
 
+## Network Configuration (/etc/network/interfaces)
+The `/etc/network/interfaces` used to define network interfaces and their associated configurations, such as IP addresses, netmasks, gateways, and more. Here's a basic example of what you might find in an /etc/network/interfaces file:
+```bash
+# The loopback network interface
+auto lo
+iface lo inet loopback
+
+# The primary network interface
+auto eth0
+iface eth0 inet static
+    address 192.168.1.100
+    netmask 255.255.255.0
+    gateway 192.168.1.1
+```
+
+**In this example:**
+- The auto lo and subsequent lines configure the loopback interface, which is used for local communication within the system.
+- The auto eth0 and subsequent lines configure the primary network interface, eth0, with a static IP address (192.168.1.100), netmask (255.255.255.0), and gateway (192.168.1.1).
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