In RFC3954 - Cisco Systems NetFlow Services Export Version 9
http://www.faqs.org/rfcs/rfc3954.html

   Field Type                Value Length  Description
                                   (bytes)
SRC_MAC                      56   6     Source MAC Address

When using a firewall that does NAT or PAT does the original MAC address get
preserved in the packet or is the firewall MAC address substituted?



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