On getting packet 's source ip address

Hi, i have been given project problem to capture packets and filter them base on their source ip addresses then later perform some analysis, but do not know how to get source ip address of a packet. could any one assist me through, its urgent please.
Thank u and all the best.

Thank u all for ur zeal [How To Ask Questions The Smart Way|http://www.catb.org/~esr/faqs/smart-questions.html#writewell]
Eric Steven Raymond
Rick Moen
Write in clear, grammatical, correctly-spelled language
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    Router(config-ext-nacl)# deny ip any
    Router(config-ext-nacl)# deny ip any     
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