diff --git a/main.py b/main.py
index 65ee1f3..8614c29 100755
--- a/main.py
+++ b/main.py
@@ -467,19 +467,21 @@ class iptables:
         """Nat filaire en v4"""
         subtable = "CONNEXION-NAT-" + nat_type['name'].upper()
         self.init_nat(subtable, decision="-")
-        self.jump_all_trafic("nat", "POSTROUTING", subtable)
+        self.jump_all_trafic("nat", "POSTROUTING", subtable, mode='4')
 
         nat_prive_ip_plage = nat_type['ip_sources']
         for nat_ip_range in range(1, 26):
             range_name = 'nat' + nat_prive_ip_plage.split('.')[1] + '_' + str("%02d" % nat_ip_range )
             self.init_nat(range_name, decision="-")
-            self.add_in_subtable("nat", subtable, '-s ' + '.'.join(nat_prive_ip_plage.split('.')[:2]) + '.' + str(nat_ip_range) + '.0/24 -j ' + range_name)
+            self.add_in_subtable("nat4", subtable, '-s ' + '.'.join(nat_prive_ip_plage.split('.')[:2]) + '.' + str(nat_ip_range) + '.0/24 -j ' + range_name)
         for nat_ip_range in range(1, 26):
             range_name = 'nat' + nat_prive_ip_plage.split('.')[1] + '_' + str("%02d" % nat_ip_range)
+            nat_rule_tcp = ""
+            nat_rule_udp = ""
             for nat_ip_subrange in range(16):
                 subrange_name = range_name + '_' + str(hex(nat_ip_subrange)[2:])
                 self.init_nat(subrange_name, decision="-")
-                self.add_in_subtable("nat", range_name, '-s ' + '.'.join(nat_prive_ip_plage.split('.')[:2]) + '.' + str(nat_ip_range) + '.' + str(nat_ip_subrange*16) + '/28 -j ' + subrange_name)
+                self.add_in_subtable("nat4", range_name, '-s ' + '.'.join(nat_prive_ip_plage.split('.')[:2]) + '.' + str(nat_ip_range) + '.' + str(nat_ip_subrange*16) + '/28 -j ' + subrange_name)
             for nat_private_ip in range(256):
                 ip_src = '.'.join(nat_prive_ip_plage.split('.')[:2]) + '.' + str(nat_ip_range) + '.' + str(nat_private_ip) + '/32'
 
@@ -489,15 +491,18 @@ class iptables:
                 subrange_name = range_name + '_' + str(hex(nat_private_ip//16)[2:])
 
                 # On nat
+
                 for interface, pub_ip_range in nat_type['interfaces_ip_to_nat'].items():
                     ip_nat = '.'.join(pub_ip_range.split('.')[:3]) + '.' + str(10*(nat_ip_range - 1) + nat_private_ip//26)
-                    self.add_in_subtable("nat", subrange_name, '-s %s -o %s -p tcp -j SNAT --to-source %s' % (ip_src, interface, ip_nat + ':' + str(port_low) + '-' + str(port_high)))
-                    self.add_in_subtable("nat", subrange_name, '-s %s -o %s -p udp -j SNAT --to-source %s' % (ip_src, interface, ip_nat + ':' + str(port_low) + '-' + str(port_high)))
+                    nat_rule_tcp += '\n-A %s -s %s -o %s -p tcp -j SNAT --to-source %s' % (subrange_name, ip_src, interface, ip_nat + ':' + str(port_low) + '-' + str(port_high))
+                    nat_rule_udp += '\n-A %s -s %s -o %s -p udp -j SNAT --to-source %s' % (subrange_name, ip_src, interface, ip_nat + ':' + str(port_low) + '-' + str(port_high))
+            self.add("nat4", nat_rule_tcp)
+            self.add("nat4", nat_rule_udp)
 
         # On nat tout ce qui match dans les règles et qui n'est pas du tcp/udp derrière la première ip publique unused (25*10) + 1
         # Ne pas oublier de loguer ce qui sort de cette ip
         for interface, pub_ip_range in nat_type['interfaces_ip_to_nat'].items():
-            self.add_in_subtable("nat", subtable, '-s ' + nat_prive_ip_plage + ' -o %s -j SNAT --to-source ' % (interface,)  + '.'.join(pub_ip_range.split('.')[:3]) + '.250')
+            self.add_in_subtable("nat4", subtable, '-s ' + nat_prive_ip_plage + ' -o %s -j SNAT --to-source ' % (interface,)  + '.'.join(pub_ip_range.split('.')[:3]) + '.250')
 
     def gen_mangle(self, empty=False):
         """Génération de la chaine mangle"""