# 3. Perform OS Discovery
## 1. Identify OS with TTL in wireshark
Follow TCP stream in wireshark. Check the ICMP reply after pinging. If TTL is around 128, its Windows, if around 64, its Linux
## 2. Perform OS Discovery using NSE scripting Engine
```
sudo nmap -O 192.168.18.110
sudo nmap -A 192.168.18.110
```
Enumerating OS details with nmap script over smb
```
sudo nmap --script smb-os-discovery.nse 192.168.18.110
```
## 3. Unicornscan
{% embed url="" %}
```
unicornscan 192.168.18.100 - Iv
```
-I is for immediate scan and v is for verbose scan.
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