diff --git a/centreon-plugins/src/Centreon/SNMP/Utils.pm b/centreon-plugins/src/Centreon/SNMP/Utils.pm
new file mode 100644
index 000000000..fbc1dc99c
--- /dev/null
+++ b/centreon-plugins/src/Centreon/SNMP/Utils.pm
@@ -0,0 +1,152 @@
+################################################################################
+# Copyright 2005-2011 MERETHIS
+# Centreon is developped by : Julien Mathis and Romain Le Merlus under
+# GPL Licence 2.0.
+# 
+# This program is free software; you can redistribute it and/or modify it under 
+# the terms of the GNU General Public License as published by the Free Software 
+# Foundation ; either version 2 of the License.
+# 
+# This program is distributed in the hope that it will be useful, but WITHOUT ANY
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A 
+# PARTICULAR PURPOSE. See the GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License along with 
+# this program; if not, see <http://www.gnu.org/licenses>.
+# 
+# Linking this program statically or dynamically with other modules is making a 
+# combined work based on this program. Thus, the terms and conditions of the GNU 
+# General Public License cover the whole combination.
+# 
+# As a special exception, the copyright holders of this program give MERETHIS 
+# permission to link this program with independent modules to produce an executable, 
+# regardless of the license terms of these independent modules, and to copy and 
+# distribute the resulting executable under terms of MERETHIS choice, provided that 
+# MERETHIS also meet, for each linked independent module, the terms  and conditions 
+# of the license of that module. An independent module is a module which is not 
+# derived from this program. If you modify this program, you may extend this 
+# exception to your version of the program, but you are not obliged to do so. If you
+# do not wish to do so, delete this exception statement from your version.
+# 
+# For more information : contact@centreon.com
+# 
+# SVN : $URL
+# SVN : $Id
+#
+####################################################################################
+
+use strict;
+use Net::SNMP qw(:snmp);
+use warnings;
+
+package Centreon::SNMP::Utils;
+
+# This method  takes the version argument given by the user and 
+# return true only if snmp version value is known
+sub checkVersion{
+	my $self = shift;
+	my $snmpversion = shift;
+	$snmpversion =~ s/^v//;
+	
+	if ($snmpversion !~ /1|2c|2|3/) {
+		print "Wrong SNMP version\n";
+		return 0;
+
+	}
+	return 1;
+}
+
+
+# This method take the v3 parameter (username,authprotocol,authpassword,privprotocol,privpassword) in argument and return the session type
+# sesssion type = 1 si snmp v1 / v2
+# session type = 2 si snmp v3 AuthNoPriv
+# session type = 3 si snmp v3 AuthPriv
+# session type = 0 si erreur;
+sub checkSessiontype{
+	my $self = shift;
+	my $username = shift;
+	my $authprotocol = shift;
+	my $authpassword = shift;
+	my $privprotocol = shift;
+	my $privpassword = shift;
+	my $sessionType = 1;
+
+	if (defined($authprotocol) && defined($authpassword) && defined($username)) {
+		if ($authprotocol ne "MD5" && $authprotocol ne "SHA1") {
+			print "Wrong authentication protocol. Must be MD5 or SHA1 \n";
+			return 0;
+		}
+		$sessionType = 2;
+		if (defined($privpassword) && defined($privprotocol)) {
+			if ($privprotocol ne "DES" && $privprotocol ne "AES") {
+				print "Wrong encryption protocol. Must be DES or AES\n";
+				return  0;
+			}
+			return 3;
+		}
+	} else{
+		print "Missing parameter to open SNMPv3 session\n";
+		return 0;
+	}
+	return $sessionType;
+}
+
+# Method to connect to the remote host
+# This method take the hash table option as argument
+# return $session if OK or 0 if not
+sub connection
+{
+	my $self = shift;
+	my $sessionType = shift;
+	my $options = shift;
+	my ($session, $error);
+	
+	if ($sessionType == 1) {
+		if (!defined($options->{'host'}) || !defined($options->{'snmpport'}) || !defined($options->{'snmpcomm'}) || !defined($options->{'snmpversion'})) {
+			print("Error when trying to connect - mission argument(s)\n");
+			return 0;
+		}
+		($session, $error) = Net::SNMP->session(-hostname => $options->{'host'}, 
+												-community => $options->{'snmpcomm'}, 
+												-version => $options->{'snmpversion'},
+												-port => $options->{'snmpport'});
+
+	} elsif ($sessionType == 2) {
+		($session, $error) = Net::SNMP->session(-hostname => $options->{'host'}, 
+												-version => $options->{'snmpversion'},
+												-username => $options->{'username'},
+												-authpassword => $options->{'authpassword'},
+												-authprotocol => $options->{'authprotocol'},
+												-port => $options->{'snmpport'});
+	} else {
+		($session, $error) = Net::SNMP->session(-hostname => $options->{'host'}, 
+												-version => $options->{'snmpversion'},
+												-username => $options->{'username'},
+												-authpassword => $options->{'authpassword'},
+												-authprotocol => $options->{'authprotocol'},
+												-privpassword   => $options->{'privpassword'},
+												-privprotocol => $options->{'privprotocol'},
+												-port => $options->{'snmpport'});
+
+	}
+	if (defined($error) && $error ne "") {
+		print("SESSION ERROR: ".$error."\n");
+		return 0;
+	}
+	return $session;
+}
+
+# Test if OID passed in 2nd parameter exists
+sub testOID{
+	my $self = shift;
+	my $sess = $_[0];
+    my $OID_toTest = $_[1];
+    my $result = $sess->get_table(Baseoid => $OID_toTest);
+    if (!defined($result)) {
+    	return 0;
+    } else{
+		return 1;
+	}
+}
+
+1;
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