On 12/21/2011 2:03 PM, [email protected] wrote:
We discover there are so many (source) ip not belonging to our network
to go to outside.

We can block it but don't know how to locate the source.

Any tools can be easily found out.
http://lmgtfy.com/?q=unicast+rpf

Steinar Haug, Nethelp consulting, [email protected]


Also - http://lmgtfy.com/?q=tracing+spoofed+source+on+network

Which get you to some strategies for finding the source(s) on your network (which I believe was the OP's question). Including:
  http://www.csm.ornl.gov/~dunigan/oci/bktrk.html
  http://www.cymru.com/Documents/tracking-spoofed.html

-DMM


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