Stealth sensor on SPAN port w/o tap

[Robert MacKinnon <robert.mackinnon () broadpark no>]

I've been experimenting with getting my first snort sensor online but have 
not had success yet with configuring SPAN on the port to which the sensor 
is installed in a stealth mode.

The environ is PC with dual 100Mb NICs, snort v1.9.0 on RH v7.3.  One NIC 
(eth1) is connected into a managment net and configured with an IP 
address.  The other interface (eth0) is connected to a SPAN port 
(monitoring three other ports on the same Catalyst 2900XL, same VLAN) and 
has no IP address assigned.

Running "snort -dev -i eth0"  produces no output.  OpenPCap() warns about 
the missing IPv4 address but absolutely no packets are captured.  If I 
assign an IP address to the port, capturing functions as expected.

I've read all I can find on the Internet about taps, SPAN ports and snort 
but nothing addresses this problem.  Will I have to invest in a tap to get 
this to work?  TIA.

        - Rob.




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