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Egress Filter - spoof packets denied

I applied Egress filters on my external routers to only allow out my valid NAT IPs. looking at the logs I see single packets with spoof addresses blocked every 15 to 20 minutes

How can I find where these are coming from. I assume a sniffer which i do not have. If it is a Sniffer that is needed are there any recommended ones and how is it used in a switched environment.

Thanks

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Re: Egress Filter - spoof packets denied

To use a sniifer in switched environement, you need to use the SPAN feature on the switches. This doc might help you :

http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note09186a008015c612.shtml

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