Nagios install on CentOS 5

There are a ton of sites/ HOWTOs, examples out there, this is just a reminder of the damn RPM necessary packages to get the Nagios up & running in no time on a CentOS 5 boxen.
All the packages (that can not be installed via yum) are from DAG

fping is the only dependency that has not other one but itself, and perl(Net::SNMP) is the one that has all the other ones.
After the install, Nagios' configuration files will be on '/etc/nagios/' (with a ready made minimalist configuration on the file 'localhost.cfg') and the check plugins will reside on '/usr/lib/nagios/plugins/'.

There will be also the web access configuration file on '/etc/httpd/conf.d/mrtg.conf'.
The Nagios RPM sets itself to start automagically on RunLevels 3,4,5.

# rpm --test -ivh fping-2.4-1.b2.2.el5.rf.i386.rpm 
warning: fping-2.4-1.b2.2.el5.rf.i386.rpm: Header V3 DSA signature: NOKEY, key ID 6b8d79e6
Preparing...                ########################################### [100%]

# rpm --test -ivh nagios-2.9-1.el5.rf.i386.rpm 
warning: nagios-2.9-1.el5.rf.i386.rpm: Header V3 DSA signature: NOKEY, key ID 6b8d79e6
error: Failed dependencies:
        libltdl.so.3 is needed by nagios-2.9-1.el5.rf.i386

[root@ltfs351 nagios]# rpm --test -ivh nagios-2.9-1.el5.rf.i386.rpm libtool-libs-1.5.6-4.EL4.2.i386.rpm 
warning: nagios-2.9-1.el5.rf.i386.rpm: Header V3 DSA signature: NOKEY, key ID 6b8d79e6
warning: libtool-libs-1.5.6-4.EL4.2.i386.rpm: Header V3 DSA signature: NOKEY, key ID db42a60e
Preparing...                ########################################### [100%]

[root@ltfs351 nagios]# rpm -ivh nagios-2.9-1.el5.rf.i386.rpm libtool-libs-1.5.6-4.EL4.2.i386.rpm 
warning: nagios-2.9-1.el5.rf.i386.rpm: Header V3 DSA signature: NOKEY, key ID 6b8d79e6
warning: libtool-libs-1.5.6-4.EL4.2.i386.rpm: Header V3 DSA signature: NOKEY, key ID db42a60e
Preparing...                ########################################### [100%]
   1:libtool-libs           ########################################### [ 50%]
   2:nagios                 ########################################### [100%]

# rpm --test -ivh nagios-plugins-1.4.9-1.el5.rf.i386.rpm 
warning: nagios-plugins-1.4.9-1.el5.rf.i386.rpm: Header V3 DSA signature: NOKEY, key ID 6b8d79e6
error: Failed dependencies:
        perl(Net::SNMP) is needed by nagios-plugins-1.4.9-1.el5.rf.i386

# rpm --test -ivh nagios-plugins-1.4.9-1.el5.rf.i386.rpm perl-Net-SNMP-5.2.0-1.2.el5.rf.noarch.rpm
warning: nagios-plugins-1.4.9-1.el5.rf.i386.rpm: Header V3 DSA signature: NOKEY, key ID 6b8d79e6
error: Failed dependencies:
        perl(Crypt::DES) is needed by perl-Net-SNMP-5.2.0-1.2.el5.rf.noarch
        perl(Digest::HMAC) is needed by perl-Net-SNMP-5.2.0-1.2.el5.rf.noarch
        perl(Digest::SHA1) is needed by perl-Net-SNMP-5.2.0-1.2.el5.rf.noarch

# rpm --test -ivh nagios-plugins-1.4.9-1.el5.rf.i386.rpm perl-Net-SNMP-5.2.0-1.2.el5.rf.noarch.rpm \
perl-Crypt-DES-2.05-3.2.el5.rf.i386.rpm perl-Digest-HMAC-1.01-2.rf.0.rh7.rf.noarch.rpm \
perl-Digest-SHA1-2.11-1.el5.rf.i386.rpm
warning: nagios-plugins-1.4.9-1.el5.rf.i386.rpm: Header V3 DSA signature: NOKEY, key ID 6b8d79e6
Preparing...                ########################################### [100%]

# rpm -ivh nagios-plugins-1.4.9-1.el5.rf.i386.rpm perl-Net-SNMP-5.2.0-1.2.el5.rf.noarch.rpm \
perl-Crypt-DES-2.05-3.2.el5.rf.i386.rpm perl-Digest-HMAC-1.01-2.rf.0.rh7.rf.noarch.rpm \
perl-Digest-SHA1-2.11-1.el5.rf.i386.rpm
warning: nagios-plugins-1.4.9-1.el5.rf.i386.rpm: Header V3 DSA signature: NOKEY, key ID 6b8d79e6
Preparing...                ########################################### [100%]
   1:perl-Digest-SHA1       ########################################### [ 20%]
   2:perl-Digest-HMAC       ########################################### [ 40%]
   3:perl-Crypt-DES         ########################################### [ 60%]
   4:perl-Net-SNMP          ########################################### [ 80%]
   5:nagios-plugins         ########################################### [100%]