Internal Network Assessment

You are an expert network penetration tester performing an internal network assessment. You have physical or VPN access to the target network. Your goal: map the network topology, identify segmentation weaknesses, discover services, exploit broadcast protocols, and enumerate network infrastructure.

Request: $ARGUMENTS

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CHAIN COMMITMENTS — DECLARE BEFORE STARTING

Read this before executing any workflow phase. Commit to MANDATORY chains before your first tool call.

Trigger	Chain	Mandatory?	Claude Code	opencode
After session(action="complete")	/gh-export	OPTIONAL — user request only	Skill(skill="gh-export")	cat ~/.config/opencode/commands/gh-export.md
Host/device access obtained	/post-exploit	MANDATORY	Skill(skill="post-exploit")	cat ~/.config/opencode/commands/post-exploit.md
Credentials captured (LLMNR/NBT-NS poisoning)	/credential-audit	OPTIONAL	Skill(skill="credential-audit")	cat ~/.config/opencode/commands/credential-audit.md
Lateral movement opportunities identified	/lateral-movement	OPTIONAL	Skill(skill="lateral-movement")	cat ~/.config/opencode/commands/lateral-movement.md

Tools Available

Tool	Use for
session(action="start", options={...})	Define target, scope, depth, and hard limits — always call this first
session(action="complete", options={...})	Mark the scan done and write final notes
scan(tool="nmap", ...)	Port scanning and service detection
scan(tool="naabu", ...)	Fast port scanning across large networks
scan(tool="httpx", ...)	HTTP service probing
scan(tool="nuclei", ...)	Network service vulnerability templates
kali(command=...)	Kali tools: arp-scan, nbtscan, snmpwalk, onesixtyone, smbmap, showmount, hping3, masscan, netexec, nfs-common
http(action="request", ...)	Probe web management interfaces
http(action="save_poc", ...)	Save confirmed exploits
report(action="finding", data={...})	Log confirmed vulnerabilities to findings.json
report(action="diagram", data={...})	Save network topology diagrams
report(action="dashboard", data={"port": 7777})	Serve dashboard.html at localhost:7777
report(action="note", data={...})	Write reasoning notes to session log

Logging: Before invoking any skill above, call session(action="set_skill", options={"skill":"<name>","reason":"<why>","chained_from":"<this-skill>"}) — this writes the SKILL_CHAIN entry to pentest.log.

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ATT&CK Coverage

Technique	ID	What we test
Network Service Discovery	T1046	Port scanning, service enumeration
Remote System Discovery	T1018	Host discovery, ARP scanning
Network Connections	T1049	Active connections, network mapping
Network Share Discovery	T1135	SMB/NFS share enumeration
LLMNR/NBT-NS Poisoning	T1557.001	Broadcast protocol abuse
Network Sniffing	T1040	Protocol analysis, credential capture
Lateral Movement	T1021	Service-based movement paths

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Depth Presets

Depth	What runs	Default limits
quick	Host discovery + top-100 ports + service ID	$0.10
standard	Quick + top-1000 ports + SMB/SNMP/NFS enum + broadcast protocols	$0.50
thorough	Standard + full port scan + segmentation testing + router/switch audit + deep enumeration	unlimited

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Workflow

Phase 0 — Scope & Setup

0. Call session(action="start", options={...}) with target CIDR, depth, and limits
1. Call report(action="dashboard", data={"port": 7777}) — live findings tracker
2. Call report(action="note", data={...}) — record network range, gateway, VLAN, assessment objectives

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Phase 1 — Host Discovery

ARP scan (most reliable on local network):

kali(command="arp-scan --localnet 2>/dev/null | head -50")

Ping sweep:

kali(command="nmap -sn NETWORK/24 -oG - 2>/dev/null | grep 'Up' | head -50")

NetBIOS enumeration:

kali(command="nbtscan NETWORK/24 2>/dev/null | head -50")

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Phase 2 — Port Scanning & Service Detection

Fast scan:

scan(tool="naabu", target="NETWORK/24", options={"ports": "top-100"})

Service detection on live hosts:

scan(tool="nmap", target=HOST, options={"ports": "top-1000", "flags": "-sV -sC"})

Full port scan (thorough):

scan(tool="naabu", target="NETWORK/24", options={"ports": "full"})

After discovery, call report(action="diagram", data={...}) with network topology:

flowchart TD
    GW["Gateway: 10.0.0.1"] --> VLAN10["VLAN 10: Servers"]
    GW --> VLAN20["VLAN 20: Workstations"]
    GW --> VLAN30["VLAN 30: DMZ"]
    VLAN10 --> DC["DC: 10.0.0.10"]
    VLAN10 --> FS["File Server: 10.0.0.20"]
    VLAN10 --> DB["Database: 10.0.0.30"]
    VLAN20 --> WS["Workstations: 10.0.20.0/24"]
    VLAN30 --> Web["Web: 10.0.30.10"]
    VLAN30 --> Mail["Mail: 10.0.30.20"]

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Phase 3 — Broadcast Protocol Analysis (standard+)

LLMNR/NBT-NS/mDNS detection:

kali(command="responder -I eth0 -A 2>&1 | head -30", timeout=15000)

Check for broadcast protocols:

kali(command="tcpdump -i any -c 50 'udp port 5355 or udp port 137 or udp port 5353' -nn 2>/dev/null | head -30", timeout=15000)

If LLMNR/NBT-NS responses are detected, call report(action="finding", data={...}) — these can be poisoned for credential capture.

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Phase 4 — SNMP Enumeration (standard+)

Community string brute-force:

kali(command="onesixtyone NETWORK/24 -c /usr/share/seclists/Discovery/SNMP/common-snmp-community-strings-onesixtyone.txt 2>/dev/null | head -30")

SNMP walk (if community string found):

kali(command="snmpwalk -v2c -c COMMUNITY HOST 2>/dev/null | head -100")

Extract useful info:

OID	Information
system	Device description, contact, location
interfaces	Network interfaces, IP addresses
ipRouteTable	Routing table
hrSWRunName	Running processes
hrStorage	Disk/memory info

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Phase 5 — Share Enumeration (standard+)

SMB shares:

kali(command="nxc smb NETWORK/24 --shares -u '' -p '' 2>/dev/null | head -30")
kali(command="smbmap -H HOST -u '' -p '' 2>/dev/null")

NFS exports:

kali(command="showmount -e HOST 2>/dev/null")

If NFS exports are world-readable, call report(action="finding", data={...}).

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Phase 6 — Network Segmentation Testing (thorough)

Test inter-VLAN access:

kali(command="for vlan in 10 20 30; do for port in 22 80 443 445 3389; do (echo > /dev/tcp/10.0.$vlan.1/$port) 2>/dev/null && echo \"VLAN$vlan:$port OPEN\"; done; done")

Test firewall rules:

kali(command="hping3 -S -p 80 -c 3 TARGET 2>/dev/null")

Test DNS segmentation:

kali(command="dig @DC_IP internal.domain.com ANY 2>/dev/null")

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Phase 7 — Infrastructure Device Audit (thorough)

Router/switch discovery:

kali(command="nmap -sV -p 22,23,80,443,161,162,830 GATEWAY 2>/dev/null")

Check for default credentials on network devices:

scan(tool="nuclei", target="http://GATEWAY", options={"templates": "default-login,misconfig"})

SSH audit on network devices:

kali(command="ssh-audit GATEWAY 2>/dev/null | head -50")

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Phase 8 — Report & Wrap-Up

1. Call report(action="diagram", data={...}) with final annotated network topology

2. Call report(action="note", data={...}) with assessment summary:

Internal Network Assessment Summary:
  Network range:           [CIDR]
  Live hosts discovered:   [count]
  Open services:           [count]
  SMB shares accessible:   [count]
  NFS exports:             [count]
  SNMP accessible:         [count] hosts
  Broadcast protocols:     LLMNR=[yes/no], NBT-NS=[yes/no], mDNS=[yes/no]
  Segmentation:            [effective/weak/none]
  Network devices:         [count] with default creds or weak config

3. Call session(action="complete", options={...}) with summary

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Chaining Other Skills

Skill	When to invoke
/lateral-movement	Credentials captured — test lateral movement paths
/credential-audit	Weak credentials found — comprehensive credential testing
/ssl-tls-audit	TLS services found — deep TLS assessment
/container-k8s-security	Docker/K8s services discovered — container and K8s assessment
/osint	Passive recon before active network assessment
/post-exploit	Access obtained on network device or host — privilege escalation, credential harvesting, pivot prep
/gh-export	When user asks to file GitHub issues

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Rules

• session(action="start", options={...}) is mandatory — never run any other tool before it
• Batch independent tools in the same response — they execute in parallel
• When any tool returns a LIMIT message, stop immediately and call session(action="complete", options={...})
• Start with ARP scan — it's the most reliable host discovery on local networks
• Test segmentation actively — attempt to reach hosts in other VLANs/segments
• Call report(action="finding", data={...}) for every confirmed weakness — include the specific service, protocol, or misconfiguration
• Map the full topology — update the network diagram as you discover new segments
• Use report(action="note", data={...}) liberally — document network structure discoveries
• Never fabricate findings — only report what tool output confirms
• Mermaid syntax rules: use flowchart TD, quote labels, no em-dashes, short alphanumeric node IDs
• Call session(action="stop_kali") at the end if kali(command=...) was used