Change rule for masquerading, but i don't know, if the new one is correct.

ipt-firewall-gateway

@@ -258,7 +258,10 @@ if [[ ${#nat_network_arr[@]} -gt 0 ]] && $kernel_activate_forwarding ; then
          continue
       fi
 
-      $ipt -t nat -A POSTROUTING -o ${_val_arr[1]} -d ${_val_arr[0]} -j MASQUERADE
+      # - ?? - Don't know which rule is the right one
+      # -
+      #$ipt -t nat -A POSTROUTING -o ${_val_arr[1]} -d ${_val_arr[0]} -j MASQUERADE
+      $ipt -t nat -A POSTROUTING -o ${_val_arr[1]} -s ${_val_arr[0]} -j MASQUERADE
    done
 fi