Scan Techniques, UDP Scan (-sU)
● UDP Scan,● Slower● Combine it with other scans● Closed ports, delays UDP scan sudo nmap -sU -v vps.chrisjanel.eu If marked as Open:Filter than scan with version detection: nmap 192.168.1.1 -sU -v -sV If ports…
Day: October 2, 2025
Scan Techniques, TCP Connect Scan (-sT)
TCP scan (Connect Scan) when SYN is not available (usually when user is not root or admin Examples nmap -T4 -sT vps.chrisjanel.eu Links https://vps.chrisjanel.eu/wp-admin/post.php?post=109&action=edit
Scan Techniques, TCP SYN (Stealth) scan, -sS
Half open scan Mark as filtered if no response or ICMP error Faster than -sT nmap 192.168.1.1 -sS -vsudo nmap -p2222 --packet-trace -d5 vps.chrisjanel.eu Links https://nmap.org/book/synscan.html#scan-methods-fig-syn-scan-filtered
Linux UFW
Check Status and enable firewall ufw statusufw enable ufw status verboseufw status numbered Allow – Deny (Input, Output, Forward) ufw default allow outgoingufw default allow incomingufw default deny outgoingufw default deny incoming Management Delete Numbered…