Snort 2.9.9.x on Ubuntu – Quick Install Guide
The instructions below show how to install Snort 2.9.9.x on both the x86 and x64 architectures for Ubuntu 14 and 16. If you want a more in-depth explanation of the install steps, as well as instructions on how to configure and enhance Snort’s functionality, see my in-depth series for installing Snort on Ubuntu.
If you want to test the new alpha version of Snort (Version 3.0 Alpha 4), please see my article: Installing Snort 3 Alpha in Ubuntu
If you want to work with OpenAppID, please see my guide for OpenAppID for Snort 2.9.9.x on Ubuntu.
Let Us Begin:
So let’s get started. First we will create a directory to save the downloaded tarball files:
mkdir ~/snort_src cd ~/snort_src
Next we need to install all the pre-requisites from the Ubuntu repositories:
sudo apt-get install -y build-essential libpcap-dev libpcre3-dev libdumbnet-dev bison flex zlib1g-dev liblzma-dev openssl libssl-dev
We need the development libraries for Nghttp2. On Ubuntu 16 this is simple:
# Ubuntu 16 only (not Ubuntu 14) sudo apt-get install -y libnghttp2-dev
On Ubuntu 14, we do this from scratch:
# Ubuntu 14 only (not Ubuntu 16) sudo apt-get install -y autoconf libtool pkg-config cd ~/snort_src wget https://github.com/nghttp2/nghttp2/releases/download/v1.17.0/nghttp2-1.17.0.tar.gz tar -xzvf nghttp2-1.17.0.tar.gz cd nghttp2-1.17.0 autoreconf -i --force automake autoconf ./configure --enable-lib-only make sudo make install
Disable LRO and GRO for all interfaces Snort will listen on under /etc/network/interfaces. using ethtool. An explanation of LRO and GRO are in the The Snort Manual. Use an editor to edit the network interfaces file:
sudo vi /etc/network/interfaces
and for every interface that Snort will listen on (one interface for simple setups, multiple interfaces for more complex setups), add the following two lines, changing eth0 to match the interface:
post-up ethtool -K eth0 gro off post-up ethtool -K eth0 lro off
for example, my /etc/network/interfaces file looks like this:
source /etc/network/interfaces.d/* # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth0 iface eth0 inet dhcp post-up ethtool -K eth0 gro off post-up ethtool -K eth0 lro off
Reboot the system and verify that LRO and GRO are off:
user@snortserver:~$ ethtool -k eth0 | grep receive-offload generic-receive-offload: off large-receive-offload: off
Download and install Data Acquisition library (DAQ) from the Snort website:
cd ~/snort_src wget https://www.snort.org/downloads/snort/daq-2.0.6.tar.gz tar -xvzf daq-2.0.6.tar.gz cd daq-2.0.6 ./configure make sudo make install
Now we are ready to install Snort from source:
cd ~/snort_src wget https://snort.org/downloads/snort/snort-220.127.116.11.tar.gz tar -xvzf snort-18.104.22.168.tar.gz cd snort-22.214.171.124 ./configure --enable-sourcefire make sudo make install
Run the following command to update shared libraries:
Since the Snort installation places the Snort binary at /usr/local/bin/snort, it is common to create a symlink to /usr/sbin/snort:
sudo ln -s /usr/local/bin/snort /usr/sbin/snort
The last step of our Snort installation is to test that the Snort Binary runs. Execute Snort with the -V flag, which causes Snort to print the current version. You should see output similar to the following:
user@snortserver:~$ snort -V ,,_ -*> Snort! <*- o" )~ Version 126.96.36.199 GRE (Build 56) '''' By Martin Roesch & The Snort Team: http://www.snort.org/contact#team Copyright (C) 2014-2016 Cisco and/or its affiliates. All rights reserved. Copyright (C) 1998-2013 Sourcefire, Inc., et al. Using libpcap version 1.7.4 Using PCRE version: 8.38 2015-11-23 Using ZLIB version: 1.2.8 user@snortserver:~$
If you have output similar to the above, then Snort is installed and works. If you want to learn more about how to run Snort, and how to install additional software to enhance a Snort system, see my in-depth series for installing Snort on Ubuntu.
If you have any questions or recommendations, please contact me. I can’t always answer questions right away, but I will do my best to get back to you. I welcome all recommendations and corrections.