+# If a list of strings is passed, each string in the list must be the name of the network used for the
+# chain indexed by the entry position in the list.
+# The list must have at least as many entries as there are chains
+# Example:
+# external_networks:
+# left: ['ext-lnet', 'ext-lnet2']
+# right: ['ext-rnet', 'ext-rnet2']
+#