diff --git a/hooks/post_iptables_rules b/hooks/post_iptables_rules
index 903c649..cb99f53 100644
--- a/hooks/post_iptables_rules
+++ b/hooks/post_iptables_rules
@@ -1,68 +1,57 @@
 #!/bin/bash
 
-multissid=$(grep multissid /etc/yunohost/apps/hotspot/settings.yml | cut -d: -f2 | sed "s/[ ']//g")
-interface=$(grep wifi_device /etc/yunohost/apps/hotspot/settings.yml | cut -d: -f2 | sed "s/[ ']//g")
-IFS='|' read -a captive_portal <<< "$(grep captive_portal /etc/yunohost/apps/hotspot/settings.yml | grep -v captive_portal_url | cut -d: -f2 | sed "s/[ ']//g")"
-IFS='|' read -a ipv4 <<< "$(grep ip4_nat_prefix /etc/yunohost/apps/hotspot/settings.yml | cut -d: -f2 | sed "s/[ ']//g")"
-IFS='|' read -a ipv6 <<< "$(grep ip6_net /etc/yunohost/apps/hotspot/settings.yml | cut -d: -f2 | sed "s/[ ']//g")"
+wifi_device=$(ynh_app_setting_get --app=$app --key=wifi_device)
+captive_portal=$(ynh_app_setting_get --app=$app --key=captive_portal)
+ip4_prefix=$(ynh_app_setting_get --app=$app --key=ip4_nat_prefix)
+ip6_prefix=$(ynh_app_setting_get --app=$app --key=ip6_net)
 
 iptables -w -N hotspot_fwd
 ip6tables -w -N hotspot_fwd
-for (( j=0; j<multissid; j++ ));
+
+if [[ "${captive_portal}" != "1" ]]
+then
+    exit 0
+fi
+
+for iptables_cmd in iptables ip6tables;
 do
-    if [[ "${captive_portal[$j]}" != "1" ]]
-    then
-        continue
+    if [[ "${iptables_cmd}" == "iptables" ]]; then
+        prefix="${ip4_prefix}"
+        ip="${ip4_prefix}.1"
+        subnet="${ip4_prefix}.0/24"
+    else
+        prefix="${ip6_prefix}"
+        ip="${ip6_prefix}1"
+        subnet="${ip6_prefix}1/64"
     fi
 
-    for iptables_cmd in iptables ip6tables;
-    do
-        if [[ "${iptables_cmd}" == "iptables" ]]; then
-            ipv4=${ipv4[$j]}
-            if [[ "${ipv4}" == "" ]]
-            then
-                continue
-            fi
-            ip=$ipv4.1
-            subnet=$ipv4.0/24
-            mac_adresses=$(grep "$ipv4" /etc/hotspot/allowed.csv | cut -d, -f3)
-        else
-            ipv6=${ipv6[$j]}
-            if [[ "${ipv6}" == "" ]]
-            then
-                continue
-            fi
-            ip=$ipv6::1
-            subnet=$ipv6::1
-            mac_adresses=$(grep "$ipv6" /etc/hotspot/allowed.csv | cut -d, -f3)
-        fi
+    mac_addresses=$(grep "${prefix}" /etc/hotspot/allowed.csv | cut -d, -f3)
 
-        # Allow to request 4253 port
-        $iptables_cmd -w -A INPUT -i $interface -m udp -p udp --dport 4253 -j ACCEPT
+    # Allow to request 4253 port
+    $iptables_cmd -w -A INPUT -i "${wifi_device}" -m udp -p udp --dport 4253 -j ACCEPT
 
-        # Drop all packets going on external internet
-        $iptables_cmd -w -A hotspot_fwd -s $subnet -j DROP
+    # Drop all packets going on external internet
+    $iptables_cmd -w -A hotspot_fwd -s "${subnet}" -j DROP
 
-        # Force to use the fakeDNS
-        $iptables_cmd -w -A PREROUTING -i $interface -s $subnet -p udp --dport 53 -j DNAT --to-destination $ip:4253
+    # Force to use the fakeDNS
+    $iptables_cmd -w -A PREROUTING -i "${wifi_device}" -s "${subnet}" -p udp --dport 53 -j DNAT --to-destination "${ip}:4253"
 
-        # Make things working with DoH 
-        # Warning: this rules to ssupport DoH let info in nginx logs on which website the user try to access...
-        # Only activating 80 and not 443 reduces a bit the issues.
-        # A better approach could be to list all ips used by domains dedicated to captive portal detection.
-        $iptables_cmd -w -A PREROUTING -i $interface -s $subnet -p tcp --dport 80 -j DNAT --to-destination $ip:80
-        #$iptables_cmd -w -A PREROUTING -i $interface -s $subnet -p tcp --dport 443 -j DNAT --to-destination $ip:443
+    # Make things working with DoH 
+    # Warning: this rules to ssupport DoH let info in nginx logs on which website the user try to access...
+    # Only activating 80 and not 443 reduces a bit the issues.
+    # A better approach could be to list all ips used by domains dedicated to captive portal detection.
+    $iptables_cmd -w -A PREROUTING -i "${wifi_device}" -s "${subnet}" -p tcp --dport 80 -j DNAT --to-destination "${ip}:80"
+    #$iptables_cmd -w -A PREROUTING -i "${wifi_device}" -s "${subnet}" -p tcp --dport 443 -j DNAT --to-destination "${ip}:443"
 
-        # Maybe needed, maybe not (i din't need this when vpn is activated)
-        #$iptables_cmd -t nat -A POSTROUTING -o $interface -j MASQUERADE
+    # Maybe needed, maybe not (i din't need this when vpn is activated)
+    #$iptables_cmd -t nat -A POSTROUTING -o "${wifi_device}" -j MASQUERADE
 
-        # Allow specific mac adress to use external internet
-        for mac in ${mac_adresses}; do
-          $iptables_cmd -w -I hotspot_fwd 1 -s $subnet -m mac --mac-source $mac -j ACCEPT
-          $iptables_cmd -t nat -w -I PREROUTING 1 -i $interface -s $subnet -m mac --mac-source $mac -j ACCEPT
-        done
-
-        $iptables_cmd -w -I FORWARD 1 -i $interface -j hotspot_fwd
+    # Allow specific mac adress to use external internet
+    for mac in ${mac_addresses}; do
+        $iptables_cmd -w -I hotspot_fwd 1 -s "${subnet}" -m mac --mac-source "${mac}" -j ACCEPT
+        $iptables_cmd -t nat -w -I PREROUTING 1 -i "${wifi_device}" -s "${subnet}" -m mac --mac-source "${mac}" -j ACCEPT
     done
+
+    $iptables_cmd -w -I FORWARD 1 -i "${wifi_device}" -j hotspot_fwd
 done
 exit 0