Weight of the packet with privileged (=1024) destination port. -psd-lo-ports-weight weight, default value: 3.-psd-delay-threshold delay, default value: 300 (3 seconds)ĭelay (in hundredths of second) for the packets with different destination ports coming from the same host to be treated as possible port scan subsequence.Total weight of the latest TCP/UDP packets with different destination ports coming from the same host to be treated as port scan sequence. -psd-weight-threshold threshold, default value: 21. It is used on some linux-based commercial routers as well. For example to scan all possible 65535 ports (except port number 0):Īnti-scanning techniques iptables PSD module In addition, it is possible to specify all ports before/after given one by skipping the starting/ending port when using a dash. To specify a different number of common ports:ĭashes and commas work just like in #Specifying the target. open|filtered - the port is either open or filteredīy default Nmap scans the 1000 most popular ports found in /usr/share/nmap/nmap-services.closed|filtered - the port is either closed or filtered.open|closed ( unfiltered) - the port is either open or closed.These are used when Nmap cannot reliably determine the state but suspects two of the three possible states: In addition to these there are 3 more states that Nmap can classify a port. This can be due to restrictive firewall rules, which "drop" a packet without sending a reply
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