Re: Snort 3 netmap cant access gateway on FREEBSD

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)" <[email protected]>:

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, [email protected] 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

http://snort.org/contact#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

https://github.com/snort3/snort3/blob/master/doc/snort_manual.html --->

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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_______________________________________________
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[email protected]
https://lists.snort.org/mailman/listinfo/snort-devel

Please visit http://blog.snort.org for the latest news about Snort!