> For the complete documentation index, see [llms.txt](https://calvin-lai.gitbook.io/calvin-lai-security/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://calvin-lai.gitbook.io/calvin-lai-security/tools/01-reconnaissance.md).

# 01 Reconnaissance

## Nmap Scan

```
# Basic Two level Recon for exam
1) nmap -p- -T5 --min-rate=1000 10.10.10.192 -oG fkclai.nmap
2) nmap -p $(grep -Eo '[0-9]{1,5}/open' fkclai.nmap | cut -d '/' -f 1 | tr -s '\n' ',') -sC -sV 10.10.10.192 -o nmap-result.txt


# Enumerate subnet
nmap -sn 10.11.1.1/24

# Fast simple scan
nmap -sS 10.11.1.111

# Full complete slow scan with output
nmap -v -sT -A -T4 -p- -Pn --script vuln -oA full 10.11.1.111

# Scan for UDP
nmap 10.11.1.111 -sU


```

## Network Scan

```
# Netdiscover
netdiscover -i eth0
netdiscover -r 10.11.1.1/24

# Nmap
nmap -sn 10.11.1.1/24
nmap -sn 10.11.1.1-253
nmap -sn 10.11.1.*

# NetBios
nbtscan -r 10.11.1.1/24
```

## tcpdump - packet scan 

```
tcpdump -i eth0
tcpdump -c -i eth0
tcpdump -A -i eth0
tcpdump -w 0001.pcap -i eth0
tcpdump -r 0001.pcap
tcpdump -n -i eth0
tcpdump -i eth0 port 22
tcpdump -i eth0 -src 172.21.10.X
tcpdump -i eth0 -dst 172.21.10.X
```


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://calvin-lai.gitbook.io/calvin-lai-security/tools/01-reconnaissance.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.