diff --git a/src/emuvim/api/zerorpc/compute.py b/src/emuvim/api/zerorpc/compute.py
index 59b960c..6e4a083 100644
--- a/src/emuvim/api/zerorpc/compute.py
+++ b/src/emuvim/api/zerorpc/compute.py
@@ -63,8 +63,8 @@
         :param compute_name: compute container name
         :param image: image name
         :param command: command to execute
-        :param network:
-        :return: networks list({"ip": "10.0.0.254/8"}, {"ip": "11.0.0.254/24"})
+        :param network: list of all interface of the vnf, with their parameters (id=id1,ip=x.x.x.x/x),...
+        :return: networks list({"id":"input","ip": "10.0.0.254/8"}, {"id":"output","ip": "11.0.0.254/24"})
         """
         # TODO what to return UUID / given name / internal name ?
         logging.debug("RPC CALL: compute start")
diff --git a/src/emuvim/cli/compute.py b/src/emuvim/cli/compute.py
index 70de20a..006b57b 100755
--- a/src/emuvim/cli/compute.py
+++ b/src/emuvim/cli/compute.py
@@ -29,9 +29,8 @@
     def start(self, args):
         nw_list = list()
         if args.get("network") is not None:
-            networks = args.get("network").split(",")
-            for nw in networks:
-                nw_list.append({"ip": nw})
+            nw_list = self._parse_network(args.get("network"))
+
         r = self.c.compute_action_start(
             args.get("datacenter"),
             args.get("name"),
@@ -79,6 +78,21 @@
             args.get("datacenter"), args.get("name"))
         pp.pprint(r)
 
+    def _parse_network(self, network_str):
+        '''
+        parse the options for all network interfaces of the vnf
+        :param network_str: (id=x,ip=x.x.x.x/x), ...
+        :return: list of dicts [{"id":x,"ip":"x.x.x.x/x"}, ...]
+        '''
+        nw_list = list()
+        networks = network_str[1:-1].split('),(')
+        for nw in networks:
+            nw_dict = dict(tuple(e.split('=')) for e in nw.split(','))
+            nw_list.append(nw_dict)
+
+        return nw_list
+
+
 
 parser = argparse.ArgumentParser(description='son-emu compute')
 parser.add_argument(
diff --git a/src/emuvim/dcemulator/node.py b/src/emuvim/dcemulator/node.py
index 3f76df9..7590973 100755
--- a/src/emuvim/dcemulator/node.py
+++ b/src/emuvim/dcemulator/node.py
@@ -182,6 +182,8 @@
             memswap_limit="%dm" % int(mem_limit) if mem_limit > 0 else None  # lets set swap to mem limit for now
         )
         # connect all given networks
+        # if no --net option is given, network = [{}], so 1 empty dict in the list
+        # this results in 1 default interface with a default ip address
         for nw in network:
             # TODO we cannot use TCLink here (see: https://github.com/mpeuster/dockernet/issues/3)
             self.net.addLink(d, self.switch, params1=nw, cls=Link)