Flags
-a
: Target IP Address
-r
: Port Range (e.g. 1-1000)
-p
: Ports (e.g. 80,8080,1337)
--ulimit
: No. of file descriptors (Socket connects)
--top
: Scan top 1000 ports
--scan-order "Random"
: Scan ports in random order (Helps to Evade Firewall)
-b size
: Batch Size (Ports to Scan in in 1 sec)
-t milliseconds
: 4000 wait for 4 seconds before next scan. Default : 1.5 secs