Fix different errors concerning extern resources from local networks/inferfaces.

conf/post_decalrations.conf

@@ -153,7 +153,7 @@ done
 # - Allow extern service from given local interface
 # ---
 declare -a allow_local_if_to_ext_service_arr
-for val in $allow_local_if_to_ext_service ; do
+for _val in $allow_local_if_to_ext_service ; do
    allow_local_if_to_ext_service_arr+=("$_val")
 done
 
@@ -161,7 +161,7 @@ done
 # - Allow extern network from given local interface
 # ---
 declare -a allow_local_if_to_ext_net_arr
-for val in $allow_local_if_to_ext_net ; do
+for _val in $allow_local_if_to_ext_net ; do
    allow_local_if_to_ext_net_arr+=("$_val")
 done
 
@@ -169,7 +169,7 @@ done
 # - Allow extern service from given local network 
 # ---
 declare -a allow_local_net_to_ext_service_arr
-for val in $allow_local_net_to_ext_service ; do
+for _val in $allow_local_net_to_ext_service ; do
    allow_local_net_to_ext_service_arr+=("$_val")
 done
 
@@ -177,7 +177,7 @@ done
 # - Allow extern network from given local network
 # ---
 declare -a allow_local_net_to_ext_net_arr
-for val in $allow_local_net_to_ext_net ; do
+for _val in $allow_local_net_to_ext_net ; do
    allow_local_net_to_ext_net_arr+=("$_val")
 done