pkg-descr « tdetect « net - freebsd-ports-gnome - FreeBSD GNOME current development ports (https://github.com/freebsd/freebsd-ports-gnome)

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FreeBSD GNOME current development ports (https://github.com/freebsd/freebsd-ports-gnome)

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tdetect detects someone running traceroute against your system.
It does this by detecting UDP (Unix traceroute) or ICMP ECHO (Windows
traceroute) packets with TTL fields == 1.