Score:0

Snort DAQ: which NIC should run in promiscuous mode?

ps flag

I want to use Snort 2.x as IPS. i understand that I need two NICs to capture the traffic (DAQ-Mode).

  • eth0 = my network card to the WAN
  • eth1 = my internal (virtual) NIC for Snort.

My current Run-Command:

snort -u snort -g snort -c /etc/snort/snort.conf --daq afpacket -i eth0:eth1 -l /var/log/snort -Q

Which of the two card do i need to put in promiscuous mode? eth0, eth1 or even both?

Score:0
fr flag

It depends on what traffic you want to capture. If you want all of the traffic that eth0 and eth1 see, then use -i eth0:eth1.

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