# 2: interface
network_get_protocol() { __network_ifstatus "$1" "$2" ".proto"; }
+# determine the metric of the given logical interface
+# 1: destination variable
+# 2: interface
+network_get_metric() { __network_ifstatus "$1" "$2" ".metric"; }
+
# determine the layer 3 linux network device of the given logical interface
# 1: destination variable
# 2: interface