diff --git a/gestion/hptools.py b/gestion/hptools.py
index a7399384..601caf75 100755
--- a/gestion/hptools.py
+++ b/gestion/hptools.py
@@ -19,9 +19,13 @@ from os import system
 from re import findall
 from config import vlans
 
+path.append('/usr/scripts/gestion')
+from ldap_crans import crans_ldap
+cl = crans_ldap()
+
 try:
     path.append('/usr/scripts/gestion/secrets')
-    from secrets import config_snmp_secrete, reconf_snmp, engineid
+    from secrets import config_snmp_secrete, reconf_snmp
 except:
     # Si a  pas le droit de lire config_snmp_secrete
     # on va tenter de tout faire en snmpv1 et communauté public
@@ -118,10 +122,20 @@ class snmp :
         """
         self.host = host
         self.version = version
+
+        try:
+            self._machine = cl.search("host=%(host)s" % {'host': host})["machineCrans"][0]
+        except IndexError:
+            raise ValueError(u"Cette machine n'est pas un switch du Cr@ns")
+        
+        # l'engineid du switch n'est que sa mac avec quelques fioritures autour...
+        mac = self._machine.mac().replace(':', '')
+        self._engineid = '0000000b0000%(mac)s0' % {'mac': mac[:-1]}
+
         if version == '1' or version == '2c' :
             self.options = "-v %s -c '%s' %s " % ( version, community, host )
         elif version =='3' :
-            self.options = "-v 3 -e %s -u %s -a %s -A '%s' -l authNoPriv" % ( engineid[host.split('.',1)[0]], username, authentication_protocol, authentication_pass )
+            self.options = "-v 3 -e %s -u %s -a %s -A '%s' -l authNoPriv" % ( self._engineid, username, authentication_protocol, authentication_pass )
             if privacy_pass : 
                 self.options += " -x DES -X '%s' -l authPriv" % privacy_pass
             self.options += " %s " % host