OS Fingerprinting
To perform finger-print, one can use nmapnmap -O 1.2.3.4
Preventing OS fingerprint on FreeBSD
Add the following to rc.conf and reboot.# OS fingerprinting tcp_drop_synfin="YES" tcp_drop_redirect="YES"
nmap -O 1.2.3.4
# OS fingerprinting tcp_drop_synfin="YES" tcp_drop_redirect="YES"
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