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Re: pcap DAQ does not support inline
From: Michael Altizer <maltizer () sourcefire com>
Date: Thu, 25 Apr 2013 12:08:38 -0400

For Linux, your best bet is the NFQ DAQ module. See the README in the DAQ tarball for pointers on NFQ/IPTables.

On 04/24/2013 03:47 PM, Joao Daniel Neves wrote:
maltizer,

Thank you so much! It was very enlightening.
All inline modes needs a pair of interfaces? What would you suggest on this scenario ?

------------------------------------------------------------------------
Date: Wed, 24 Apr 2013 15:36:09 -0400
From: maltizer () sourcefire com
To: snort-users () lists sourceforge net
Subject: Re: [Snort-users] pcap DAQ does not support inline

You will not be able to use the AFPacket DAQ module in that scenario. The AFPacket DAQ module manually forwards packets completely unmodified back and forth across an interface pair (or pairs) when it is in inline mode (unless Snort modifies the packet). This means there will be no routing decisions, MAC address updates, or TTL drecrements involved. Also, if you're actively having the OS do the routing (or bridging), you will end up with duplicate packets being generated by the box. AFPacket operates on copies of packets received on a given interface, and may then send out a packet based on that copy in inline mode if the packet was not dropped, all of which happens in parallel with any other processing the OS is doing with the original packet.

On 04/24/2013 03:11 PM, Joao Daniel Neves wrote:

    YM
    I'm a bit ashamed. What I cant understand is if I'm running Snort
    in a router and eth0 and eth1 are been used to route packages, I
    will not be able to use Snort inline mode with this scenario?

    I tried (on a test enviroment) and it doesn't seems to work.

    I think I may be doing something wrong.

    ------------------------------------------------------------------------
    To: joaodanielnevesss () hotmail com
    <mailto:joaodanielnevesss () hotmail com>
    CC: snort-users () lists sourceforge net
    <mailto:snort-users () lists sourceforge net>
    From: snort () outlook com <mailto:snort () outlook com>
    Subject: RE: [Snort-users] pcap DAQ does not support inline
    Date: Wed, 24 Apr 2013 19:15:39 +0300

    eth0 and eth1 will be used by Snort only to pass traffic inline.

    The third interface I mentioned earlier; eth2 will be used for
    management. In this case you will not be interfering with the
    traffic.
    ------------------------------------------------------------------------
    From: Joao Daniel Neves <mailto:joaodanielnevesss () hotmail com>
    Sent: ‎4/‎24/‎2013 6:56 PM
    To: Y M <mailto:snort () outlook com>
    Cc: snort-users () lists sourceforge net
    <mailto:snort-users () lists sourceforge net>
    Subject: RE: [Snort-users] pcap DAQ does not support inline

    YM,

    But if this pair of interfaces are being used to normal traffic.
    Example:

    /usr/local/bin/snort  —daq afpacket -Q -c /etc/snort/snort.conf -i
    eth0:eth1

    if a database is listening on interface eth1, I cant acess this
    database. I cant acess anything listening on eth0 and eth1.

    Will I need and a pair of 'idle' interfaces?



    ------------------------------------------------------------------------
    To: joaodanielnevesss () hotmail com
    <mailto:joaodanielnevesss () hotmail com>
    CC: snort-users () lists sourceforge net
    <mailto:snort-users () lists sourceforge net>
    From: snort () outlook com <mailto:snort () outlook com>
    Subject: RE: [Snort-users] pcap DAQ does not support inline
    Date: Wed, 24 Apr 2013 17:20:00 +0300

    The two interfaces will be used by Snort, you will need a third
    interface for management, i.e.: ssh, database, etc.

    Also don't forget to set the daq mode, look for --daq-mode

    I haven't used ipfw, so i can't add on that.

    Please, when you reply, reply to the entire list, everybody
    benefits :)
    ------------------------------------------------------------------------
    From: Joao Daniel Neves <mailto:joaodanielnevesss () hotmail com>
    Sent: ‎4/‎24/‎2013 4:28 PM
    To: Y M <mailto:snort () outlook com>
    Subject: RE: [Snort-users] pcap DAQ does not support inline

    HI,

    YM,

    /usr/local/bin/snort  —daq afpacket -Q -c /etc/snort/snort.conf -i
    eth0:eth1

    I'm using this line to start snort. As I searched afpacket need
    two interfaces:

    /"In order to have an inline deployment you need at least one pair
    ofinterfaces for the traffic to flow through. To that end, you
    need tospecify a second interface for AFPacket to use to complete
    the bridge."
    /
    But for some reason when I used two interfaces things got weired.
    I lost SSH acess to snort. I think that the reason is because the
    traffic flow through one interface to another. Do you have some
    clues about this issue ?

    My avaliable daq modules are

    pcap(v3): readback live multi unpriv
    ipfw(v2): live inline multi unpriv
    dump(v1): readback live inline multi unpriv
    afpacket(v4): live inline multi unpriv

    With module can I use to enable in line module without needing to
    specify two interfaces?
    I think that it would be ipfw, but as far as I know ipfw is for
    bsd and I'm not using bsd.

    ------------------------------------------------------------------------
    To: joaodanielnevesss () hotmail com
    <mailto:joaodanielnevesss () hotmail com>;
    snort-users () lists sourceforge net
    <mailto:snort-users () lists sourceforge net>
    From: snort () outlook com <mailto:snort () outlook com>
    Subject: RE: [Snort-users] pcap DAQ does not support inline
    Date: Mon, 22 Apr 2013 18:56:45 +0300

    pcap does not support inline mode, it is meant for passive mode
    only. Instead, use afpacket for inline mode.

    To make sure it is installed, run Snort as

    snort --daq-list

    This will return a list of the installed daq modules.
    ------------------------------------------------------------------------
    From: Joao Daniel Neves <mailto:joaodanielnevesss () hotmail com>
    Sent: ‎4/‎22/‎2013 6:47 PM
    To: snort-users () lists sourceforge net
    <mailto:snort-users () lists sourceforge net>
    Subject: [Snort-users] pcap DAQ does not support inline

    Hi,

    I'm getting this error when running Snort in inline mode "ERROR:
    pcap DAQ does not support inline". I have searched on Google, but
    did not get any thing usefull. The point is I don't even know why
    this happening.

    What do you suggest ?

    *Some informations for debugging: *

    /My daq dir is /usr/local/lib/daq

    ls /usr/local/lib/daq
    daq_afpacket.la
    daq_afpacket.so
    daq_dump.la
    daq_dump.so
    daq_ipfw.la
    daq_ipfw.so
    daq_pcap.la
    daq_pcap.so

    I tryed to start Snort with

    /usr/local/bin/snort -Q -i eth1 --daq-dir /usr/local/lib/daq/ -c
    /etc/snort/snort.conf
    /usr/local/bin/snort -Q -de *--daq nfq* --daq-dir
    /usr/local/lib/daq -c /etc/snort/snort.conf
    /usr/local/bin/snort  —daq pcap -Q -c /etc/snort/snort.conf -i
    eth0:eth1
    /usr/local/bin/snort -Q -c /etc/snort/snort.conf -i eth0:eth1

    None of them worked.

    Some more informations

    /usr/lib/libpcap.a
    /usr/lib/libpcap.so
    /usr/lib/libpcap.so.0
    /usr/lib/libpcap.so.0.9
    /usr/lib/libpcap.so.0.9.4
    /usr/lib/libpcap.so.1
    /usr/lib/libpcap.so.1.3.0
    /usr/lib64/libpcap.so.0
    /usr/lib64/libpcap.so.0.9
    /usr/lib64/libpcap.so.0.9.4
    /usr/local/lib/libpcap.a
    /usr/local/lib/libpcap.so
    /usr/local/lib/libpcap.so.1
    /usr/local/lib/libpcap.so.1.3.0
    /usr/local/lib/daq/daq_pcap.la
    /usr/local/lib/daq/daq_pcap.so/

    Maybe those multiple versions of pcap are causing the error ?

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