Individual skill
performing-internal-network-pentesting
Methodology for internal network penetration testing from a foothold on the LAN, covering host discovery, port scanning, passive/active sniffing, MitM (ARP/DNS/ICMP/DHCPv6), and LLMNR/NBT-NS/mDNS poisoning with Responder plus relay attacks during authorized engagements.
internal/tools/skills/data/penetration-testing/performing-internal-network-pentesting/SKILL.md
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- cybersecurity Repository topic
- security Repository topic
- bug-bounty Repository topic
- automation Repository topic
- autonomous-pentesting Repository topic
- ai-agent Repository topic
- ai-security Repository topic
- ethical-hacking Repository topic
- golang Repository topic
- penetration-testing Repository topic
- penetration-testing Declared skill tag
- network-pentesting Declared skill tag
- host-discovery Declared skill tag
- llmnr-poisoning Declared skill tag
- mitm Declared skill tag
- ntlm-relay Declared skill tag
- testing Derived category
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# Performing Internal Network Pentesting
## When to Use
- When you have a foothold (drop box, VM, or compromised host) on an internal LAN
- At the start of an internal engagement to discover live hosts, open ports, and services
- When capturing credentials passively via broadcast/multicast name resolution poisoning
- When performing man-in-the-middle to intercept traffic on a switched segment
- When relaying captured NTLM authentication to reachable hosts for lateral movement
## Critical: Techniques Most Often Missed
The highest-value internal technique is poisoning LLMNR/NBT-NS/mDNS — Windows hosts fall back to these unauthenticated broadcast protocols when DNS fails, leaking NetNTLM hashes. Many testers also forget to scan broadcast addresses and to disable SMB signing checks before relaying.
