> Is there any info on how to construct the  "filter" string?? I wish to
> know all the available options, may I know where can I find it?

In the tcpdump man page, in the section that starts with

      expression
          selects which packets will be dumped.  If no expression
          is  given, all packets on the net will be dumped.  Oth-
          erwise, only packets for  which  expression  is  `true'
          will be dumped.
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