Install and configure NfSen on CentOS6.x

• NfSen 1.3.6
• nfdump 1.6.9

Prerequisites:

• EPEL Repository

• Download NfSen http://nfsen.sourceforge.net/.
• Download nfdump http://nfdump.sourceforge.net/.
• Extract files.

  tar zxvf nfdump-1.6.12.tar.gz
  tar zxvf nfsen-1.3.6p1.tar.gz

• Install development tools.

  sudo yum groupinstall development tools

• Install rrdtool.

  sudo yum install rrdtool rrdtool-devel

• Install Apache, php and perl modules.

  sudo yum install apache php perl-MailTools rrdtool-perl perl-Socket6

• Edit /etc/php.ini. Confgure date.timezone.
• Create user netflow.

  useradd netflow

• Add user netflow to apache group.

  sudo usermod -G apache netflow

• Compile and install nfdump.

  cd nfdump-1.6.12
  ./configure --prefix=/opt/nfdump --enable-nfprofile
  autoreconf
  make
  sudo make install

• Install nfsen.

  cd nfsen-1.3.6p1
  cd etc
  cp nfsen-dist.conf nfsen.conf
  vi nfsen.conf
    $BASEDIR = "/opt/nfsen";
    $HTMLDIR = "/opt/nfsen/www/";
    $PREFIX  = '/opt/nfdump/bin';
    $WWWUSER  = "apache";
    $WWWGROUP = "apache";
  
    $MAIL_FROM   = 'nfsen@yourdomain.tld';
    $SMTP_SERVER = 'fqdn.mail.server';
    
    %sources = (
        'source1' => { 'port' => '9995', 'col' => '#0000ff', 'type' => 'netflow' },
        'source2' => { 'port' => '9996', 'col' => '#cc3333', 'type' => 'netflow' },
        'source3' => { 'port' => '9997', 'col' => '#99ff33', 'type' => 'netflow' },
    );
  
  cd ..
  sudo ./install.pl etc/nfsen.conf

• Open port 80 and netflow ports. Edit /etc/sysconfig/iptables.

  -A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
  -A INPUT -m state --state NEW -m udp -p udp --dport 9995 -j ACCEPT
  -A INPUT -m state --state NEW -m udp -p udp --dport 9996 -j ACCEPT
  -A INPUT -m state --state NEW -m udp -p udp --dport 9997 -j ACCEPT

• Reload iptables.

  service iptables restart

• Add apache config. Create /etc/httpd/conf.d/nfsen.conf

  <Directory "/opt/nfsen/www">
     AllowOverride None
     Order allow,deny
     Allow from all
  </Directory>
  
  Alias /nfsen "/opt/nfsen/www"

• Start apache at boot.

  sudo chkconfig httpd on

• Start apache.

  sudo service httpd start

• Create SELinux module. Important: Modules created with audit2allow may allow more access than required.

  sudo yum install policycoreutils-python
  setenforce 0
  /opt/nfsen/bin/nfsen start
  /opt/nfsen/bin/nfsen stop
  cp /var/log/audit/audit.log /var/tmp
  cd /var/tmp
  audit2allow -M mynfsen < audit.log
  semodule -i mynfsen.pp
  setenforce 1

• Start nfsen.

  sudo /opt/nfsen/bin/nfsen start

• To start NfSen at boot, add the start script to /etc/rc.local. Or create a nice start/stop init script.
• Access NfSen at http://server/nfsen/nfsen.php.