Every sysadmin and network admin ends up with a core set of tools they reach for without thinking.
Here’s my shortlist, not installed by default, so I grap what I need. Most of these are already in Debian’s repos, so nothing exotic. If you work with web apps some of these are useful. So list is not just limited to network and system security.
Side note, the Kali tools page is a decent directory to peruse regardless of the distro you are on.
| Tool | Primary Use | Why It’s Essential |
|---|---|---|
| nmap | Network discovery and security auditing | Industry-standard for scanning hosts, open ports, services, and OS detection. |
| Wireshark | Packet analysis and network troubleshooting | Deep inspection of network traffic to diagnose issues, verify configurations, and detect anomalies. |
| tcpdump | Command-line packet capture | Lightweight alternative to Wireshark for quick captures on servers or remote systems. |
| tcpflow / netsniff-ng | Network traffic reconstruction | Useful for analyzing session data and debugging application-layer issues. |
| fping / hping3 | Host reachability and latency testing | Faster and more flexible than ping for testing multiple hosts or crafting custom probes. |
| arping / arpwatch | ARP-level discovery and monitoring | Verifies host presence at Layer 2 and detects ARP spoofing or conflicts. |
| snmp-check / onesixtyone | SNMP enumeration | Quick checks of SNMP-enabled devices for inventory and misconfigurations. |
| sslscan / sslyze | SSL/TLS configuration auditing | Verifies certificate validity, protocol support, and cipher strength on servers. |
| metasploit-framework | Vulnerability validation and patch testing | Advanced use: confirms whether known vulnerabilities are exploitable before/after patching. |
| searchsploit / exploitdb-papers | Vulnerability research | Quickly find public exploits and advisories related to versions you’re running. |
| chisel / socat / ncat / netcat | Tunneling and ad-hoc connections | Handy for port forwarding, quick listeners, and troubleshooting connectivity. |
| gvm-start (Greenbone Vulnerability Management) | Vulnerability scanning | Full-featured vulnerability scanner for regular security audits. |
| autopsy / tsk_* tools (Sleuth Kit) | Basic forensics and file recovery | Helpful for incident response or recovering deleted files on Linux/Windows filesystems. |
| yara | Malware and IOC scanning | Create or run rules to detect suspicious files during incident response. |