diff --git a/conf/main_ipv4.conf.sample b/conf/main_ipv4.conf.sample
index 12bb01d..fc38ea3 100644
--- a/conf/main_ipv4.conf.sample
+++ b/conf/main_ipv4.conf.sample
@@ -567,6 +567,8 @@ local_ntp_service=true
 
 # - SNMP services local Networks
 # -
+# - Blank separated list of ip's
+# -
 snmp_server_ips=""
 
 # - SNMP Port
@@ -852,10 +854,27 @@ other_services=""
 # --- Masuqerading
 # =============
 
+# - Masquerade (NAT) networks
+# -
+# -    nat_networks="<src-network>:<output-device> [<src-network>:<output-device>] [.."
+# -
+# - Multiple declarations (blank separated list) are possible
+# -
+# - Example:
+# -    nat_network="172.16.1.0/24:${local_if_2}
+# -                 172.16.63.0/24:${ext_if_static_1}"
+# -
+# - 172.16.1.0/24    Rescue network (routers)
+# -
+nat_networks=""
+
+
 # - Masquerade TCP Connections
 # -
 # -    masquerade_tcp_con="<src-network>:<dst-host>:<dst-port>:<output-device> [<src-network>:<dst-host>:..]"
 # -
+# - Multiple declarations (blank separated list) are possible
+# -
 # - Example:
 # -
 # -    masquerade_tcp_con="192.168.63.0/24:192.168.62.244:80:${local_if_1} 
@@ -876,14 +895,12 @@ masquerade_tcp_cons=""
 # -
 # - portforward_tcp="<device-in>:<port-in>:<ip-to-forward>:<port-out>"
 # -
-# - Multiple declarations are possible
+# - Multiple declarations (blank separated list) are possible
 # - 
 # - Example:
 # -    portforward_tcp="$ext_if_dsl_1:9997:192.168.52.25:22
 # -                     $ext_if_dsl_1:9998:192.168.53.24:22"
 # -
-# - Blank separated list
-# -
 portforward_tcp=""
 
 
@@ -891,14 +908,12 @@ portforward_tcp=""
 # -
 # - portforward_udp="<device-in>:<udp-port-in>:<ip-to-forward>:<udp-port-out>"
 # -
-# - Multiple declarations are possible
+# - Multiple declarations (blank separated list) are possible
 # - 
 # - Example:
 # -    portforward_udp="$ext_if_dsl_1:1094:192.168.52.25:1094
 # -                     $ext_if_dsl_1:9999:192.168.53.24:1095"
 # -
-# - Blank separated list
-# -
 portforward_udp=""
 
 
diff --git a/conf/post_decalrations.conf b/conf/post_decalrations.conf
index a90ea98..5d647bd 100644
--- a/conf/post_decalrations.conf
+++ b/conf/post_decalrations.conf
@@ -8,6 +8,12 @@
 # ---
 # - Masquerade TCP Connections
 # ---
+
+declare -a nat_network_arr
+for _net in $nat_networks ; do
+   nat_network_arr+=("$_net")
+done
+
 declare -a masquerade_tcp_con_arr
 for _str in $masquerade_tcp_cons ; do
    masquerade_tcp_con_arr+=("$_str")