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tcpdump is not part of the Solaris distribution but can be downloaded from the Internet from sites such as http://www.sunfreeware.com/
There's also Wireshark which you can either compile from source or download pre-built packages from http://www.sunfreeware.com/
Solaris does come with a packet capture tool called snoop(1M) so read the man page to understand how to use it. The syntax is very similar to tcpdump and wireshark.
System Administration Commands snoop(1M) NAME snoop - capture and inspect network packets SYNOPSIS snoop [-aqrCDINPSvV] [-t [r | a | d]] [-c maxcount] [-d device] [-i filename] [-n filename] [-o filename] [-p first [, last]] [-s snaplen] [-x offset [, length]] [expression]