Password cracker required

[milind_nanal () kaleconsultants com]

Dear list,

I am looking for password dictionary / brute force cracker tool using which I can scan entire network for know default 
user name & password supplied by me. I can either supply in the command line or update in the dictionary file. The tool 
can be win 32 based or through command prompt.

Quick response is highly appreciated.

Regards,

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