strobe is a venerable TCP port-scanning utility written by Julian Assange (http://linux
.maruhn.com/sec/strobe.html). It has been around for some time and is one of the fastest
and most reliable TCP scanners available. Some of strobe’s key features include the
ability to optimize system and network resources and to scan the target system in an
efficient manner. In addition to being efficient, strobe (version 1.04 and later) will actually
grab the associated banner (if available) of each port it connects to. This may help identify
both the operating system and the running service.
The strobe output lists each listening TCP port:
[root] strobe 192.168.1.10
strobe 1.03 (c) 1995 Julian Assange (proff@suburbia.net).
192.168.1.10 echo 7/tcp Echo [95,JBP]
192.168.1.10 discard 9/tcp Discard [94,JBP]
192.168.1.10 sunrpc 111/tcp rpcbind SUN RPC
192.168.1.10 daytime 13/tcp Daytime [93,JBP]
192.168.1.10 chargen 19/tcp ttytst source
192.168.1.10 ftp 21/tcp File Transfer [Control]
[96,JBP]
192.168.1.10 exec 512/tcp remote process execution;
192.168.1.10 login 513/tcp remote login a la telnet;
192.168.1.10 cmd 514/tcp shell like exec, but automatic
192.168.1.10 ssh 22/tcp Secure Shell
192.168.1.10 telnet 23/tcp Telnet [112,JBP]
192.168.1.10 smtp 25/tcp Simple Mail Transfer [102,JBP]
192.168.1.10 nfs 2049/tcp networked file system
192.168.1.10 lockd 4045/tcp
192.168.1.10 unknown 32772/tcp unassigned
192.168.1.10 unknown 32773/tcp unassigned
192.168.1.10 unknown 32778/tcp unassigned
192.168.1.10 unknown 32799/tcp unassigned
192.168.1.10 unknown 32804/tcp unassigned
Although strobe is highly reliable, you need to keep in mind some of its limitations:
it is a TCP scanner only and does not provide UDP scanning capabilities. Therefore, in
the preceding scan we are only looking at half the picture. For additional scanning
techniques beyond what strobe can provide, we must dig deeper into our toolkit.
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