nmap -p syntax question

[ToddAndMargo <ToddAndMargo () zoho com>]

Hi All,

On the nmap command line, some questions about the "-p"
parameter:

1) what is the "-p S:xxx".  What protocol is "S"?
   By change is it ICMP?

2) when you omitt the "T:" and/or the "U:" does it check
   both TCP and UDP.  What about the mysterious "S" protocol?
   Does it check that too?

3) is
       -p 137,138,139,445
   the same as
       -p U:137,138,139,445,T:137,138,139,445
   ?

Many thanks,
-T






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