Note: This page is quite old and is likely out of date. My opinions may have also changed dramatically since this was written. It is here as a reference until I get around to updating it.
Suricata might be a better option and has packages for Fedora 15.
Useful software that can complement an IDS/IPS: OpenFPC, Snorby
Alright this is frustrating, Fedora 15 doesn't have snort packages so we're compiling from source. Here's what we need to do:
Download snort & daq source (both available on snort.org)
Install the following fedora packages and their dependencies:
yum bison flex make gcc libpcap libpcap-devel libdnet libdnet-devel zlib \ zlib-devel mysql mysql-devel -y
cd into the daq directory
./configure && make && make install
Create the file
/etc/ld.so.conf.d/snort-i386.conf with the following
cd into the snort source directory
./configure --with-mysql --enable-dynamicplugin && make && make install mkdir -p /etc/snort/rules mkdir -p /var/log/snort cd etc/ cp * /etc/snort/