In case your OS is not CentOS or the default installation does not meet your requirements, you can download and install nfdump and nfsen from the sources¹⁾.

1. Install the packets required to build and run nfsen:

   CentOS/RedHat/Oracle: 
   yum install gcc-c++,rrdtool-devel,perl-rrdtool,flex,perl-Socket6,perl-MailTools,httpd,php
   Ubuntu: 
   apt-get install build-essential flex librrd-dev byacc librrds-perl libmailtools-perl libsocket6-perl 
   apt-get install apache2 php5 libapache2-mod-php5 

2. Download source code for nfdump and nfsen and unpack archives:

   wget http://vasexperts.ru/centos/6/x86_64/nfdump-1.6.9.2.CKAT.tar.gz
   wget http://vasexperts.ru/centos/6/x86_64/nfsen-1.3.6p1.2.CKAT.tar.gz
   tar xvzf nfdump-1.6.9.2.CKAT.tar.gz
   tar xvzf nfsen-1.3.6p1.2.CKAT.tar.gz

3. Build and install nfdump:

   cd nfdump-1.6.9.2.CKAT
   ./configure --enable-scat --enable-nfprofile --prefix=/usr/bin
   make
   make install

4. Configure nfsen (or keep defaults) and install it:

   cd nfsen-1.3.6p1.2.CKAT
   vi etc/nfsen.conf
   ./install.pl etc/nfsen.conf

5. Enable nfsen start as a service. The example of init script for CentOS: etc/nfsen