hello;

We removed lro/gro and enable promiscuous mode and running snort em1:em2 inline mode with daq netmap

then All traffic breaking down to Gateway  example;  ping, ssh, internet connection

cant access (em1 connected computer(192.168.1.12))  ----> 192.168.1.1 (gateway)  
 
and cant access (em2 connected different computer(192.168.2.45)) ---> 192.168.2.1 (gateway)  
 
 
we have problem but I cant find :S  
 
 
 
FreeBSD Version : FreeBSD snort.test 11.2-RELEASE-p4
 
Snort Version : Version 3.0.0 (Build 247) FreeBSD
 
31.10.2018, 18:53, "Masud Hasan (mashasan)" <mashasan@cisco.com>:
Please turn promiscuous mode on and LRO/GRO off for both of the interface-pair (em1 and em2) as root. Before running snort, please make sure you can reach any machine on the LAN where em2 is connected. After running snort with em1:em2 inlined, you should be able to reach that LAN from the LAN where em1 is connected.
 
You can also enable debug adding "--daq-var debug" to the snort command and adding rc_debug="YES" in the rc.conf file.
 
If netmap does not work, do other daq mode works? Here is an example for Ubuntu:
http://sublimerobots.com/2016/02/snort-ips-inline-mode-on-ubuntu/
 
Also, are you on latest FreeBSD with updated netmap, since I find some online forums discussing issues with older netmap builds.
 
Thanks,
Masud
 
On Oct 31, 2018, at 5:58 AM, yunus.can@arjeta.com.tr wrote:
 
Hello;
 
We are reagain install snort netmap mode. because ipfw mode not yet supported multithreading
 
rc.conf ----> network configuration
ifconfig_em0="DHCP" ---->internet uplink      subnet -> (192.168.254.1/24) dhcp lease
ifconfig_em1="inet 192.168.1.1 netmask 255.255.255.0"
ifconfig_em2="inet 192.168.2.1 netmask 255.255.255.0"

I was start command this :
 
ifconfig em1 promisc up
 
/usr/local/snort/bin/snort -c /usr/local/snort/etc/snort/snort.lua --daq-dir /usr/local/lib/daq --daq netmap -i em1 -A alert_full -Q
 
See a Error :
 
netmap DAQ configured to inline.
Commencing packet processing
++ [0] em1
Can't initialize DAQ netmap (-1) - netmap_daq_initialize: Invalid interface specification: 'em1'!
-- [0] em1
--------------------------------------------------
Packet Statistics
--------------------------------------------------
Module Statistics
--------------------------------------------------
Summary Statistics
--------------------------------------------------
timing
                  runtime: 00:00:00
                  seconds: 0.1822
                  packets: 0
                 pkts/sec: 0
o")~   Snort exiting
 
 
 
AND reagain diffrerent start multiple interface command this
 
ifconfig em1 promisc up
 
/usr/local/snort/bin/snort -c /usr/local/snort/etc/snort/snort.lua --daq-dir /usr/local/lib/daq --daq netmap -i em1:em2 -A alert_full -Q
 
 
I was see this success start message :
port rule counts
             tcp     udp    icmp      ip
     any     472       0       1       0
   total     472       0       1       0
--------------------------------------------------
netmap DAQ configured to inline.
Commencing packet processing
++ [0] em1:em2
[em2]
  nr_tx_slots: 1024
  nr_rx_slots: 1024
  nr_tx_rings: 1
  [TX Ring 0]
    buf_ofs = 7299072
    num_slots = 1024
    nr_buf_size = 2048
    flags = 0x0
  nr_rx_rings: 1
  [RX Ring 0]
    buf_ofs = 7372800
    num_slots = 1024
    nr_buf_size = 2048
    flags = 0x0
  memsize:     343019520
  index:       1
 

BUT I cant access gateway ip address
64 bytes from 192.168.1.1: icmp_seq=6157 ttl=64 time=0.264 ms
64 bytes from 192.168.1.1: icmp_seq=6158 ttl=64 time=0.233 ms
64 bytes from 192.168.1.1: icmp_seq=6159 ttl=64 time=0.325 ms
64 bytes from 192.168.1.1: icmp_seq=6160 ttl=64 time=0.394 ms
64 bytes from 192.168.1.1: icmp_seq=6161 ttl=64 time=0.354 ms
64 bytes from 192.168.1.1: icmp_seq=6162 ttl=64 time=0.326 ms
64 bytes from 192.168.1.1: icmp_seq=6163 ttl=64 time=0.332 ms
64 bytes from 192.168.1.1: icmp_seq=6164 ttl=64 time=0.221 ms
64 bytes from 192.168.1.1: icmp_seq=6165 ttl=64 time=0.339 ms
64 bytes from 192.168.1.1: icmp_seq=6166 ttl=64 time=0.343 ms
64 bytes from 192.168.1.1: icmp_seq=6167 ttl=64 time=0.398 ms
64 bytes from 192.168.1.1: icmp_seq=6168 ttl=64 time=0.435 ms
64 bytes from 192.168.1.1: icmp_seq=6169 ttl=64 time=0.410 ms
64 bytes from 192.168.1.1: icmp_seq=6170 ttl=64 time=0.410 ms
64 bytes from 192.168.1.1: icmp_seq=6171 ttl=64 time=0.383 ms
64 bytes from 192.168.1.1: icmp_seq=6172 ttl=64 time=0.380 ms
64 bytes from 192.168.1.1: icmp_seq=6173 ttl=64 time=0.313 ms
64 bytes from 192.168.1.1: icmp_seq=6174 ttl=64 time=0.369 ms ---> started snort inline netmap module
Request timeout for icmp_seq 6175
Request timeout for icmp_seq 6176
Request timeout for icmp_seq 6177
Request timeout for icmp_seq 6178
Request timeout for icmp_seq 6179
Request timeout for icmp_seq 6180
Request timeout for icmp_seq 6181
 
 
 
 
 

Freebsd Versions :

FreeBSD snort 11.2-RELEASE-p4

Snort Versions :

   ,,_     -*> Snort++ <*-

  o"  )~   Version 3.0.0 (Build 247) FreeBSD

   ''''    By Martin Roesch & The Snort Team

           Copyright (C) 2014-2018 Cisco and/or its affiliates. All rights reserved.

           Copyright (C) 1998-2013 Sourcefire, Inc., et al.

           Using DAQ version 2.2.2

           Using LuaJIT version 2.0.5

           Using OpenSSL 1.0.2p  14 Aug 2018

           Using libpcap version 1.9.0-PRE-GIT

           Using PCRE version 8.41 2017-07-05

           Using ZLIB version 1.2.11

           Using FlatBuffers 1.8.0

           Using Hyperscan version 4.7.0 2018-10-03

           Using LZMA version 5.2.3

 
 
 
I was read this link
 
20.13.8. Netmap Module
  
 The netmap project is a framework for very high speed packet I/O. It
 is available on both FreeBSD and Linux with varying amounts of
 preparatory setup required. Specific notes for each follow.
  
 ./snort --daq netmap -i <device>
 [--daq-var debug]
  
 If you want to run netmap in inline mode, you must craft the device
 string as one or more interface pairs, where each member of a pair is
 separated by a single colon and each pair is separated by a double
 colon like this:
  
 em1:em2
  
 or this:
  
 em1:em2::em3:em4
  
 Inline operation performs Layer 2 forwarding with no MAC filtering,
 akin to the AFPacket module’s behavior. All packets received on one
 interface in an inline pair will be forwarded out the other interface
 unless dropped by the reader and vice versa.
  
 Important
  
 The interfaces will need to be up and in promiscuous mode in order to
 function (ifconfig em1 up promisc). The DAQ module does not currently
 do either of these configuration steps for itself.
  
 20.13.8.1. FreeBSD
  
 In FreeBSD 10.0, netmap has been integrated into the core OS. In
 order to use it, you must recompile your kernel with the line
  
 device netmap
  
 added to your kernel config.
 
 
 
I searched google but I cant find enough subject for netmap with snort
 
What is my problem ?
 
Can u help me ?
 
 
 
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