updated info in the exp-tool/README

diff --git a/planetlab/exp-tool/README b/planetlab/exp-tool/README
index 6cb2e4d..a932b42 100644 (file)
--- a/planetlab/exp-tool/README
+++ b/planetlab/exp-tool/README
@@ -17,16 +17,24 @@ has an IP address chosen by the experimenter. The idea is to connect
 all the tap devices through the overlay network made up of Open vSwitch
 bridges and tunnels among them.
 
+Please note that the tap device IP address is required for technical
+reasons, even if you do not plan to use it.
+
 
 * Installation
 
-On each sliver we need to install sliver-openvswitch and obtain the
-following tags:
+In new slices, sliver-openvswitch comes preinstalled together with
+the vsys scripts it needs. All you have to do is ask your administrator
+for a private IP subnet for your slice.
+
+On older slices you may have to install sliver-openvswitch on each sliver
+and obtain the following tags:
 
 NAME           VALUE
 vsys           fd_tuntap
 vsys           vif_up
 vsys           vif_down
+vsys           promisc
 vsys_net       (some subnet)
 
 
@@ -59,8 +67,8 @@ contains four nodes:
 4) planetlab2.urv.cat
 
 
-Assume we have reserved subnet 10.0.9.0/24 using vsys_net.  We are
-goint to build the following overlay network:
+Assume we have obtained subnet 10.0.9.0/24 for our slice.  We are
+going to build the following overlay network:
 
    10.0.9.1/24   10.0.9.2/24   10.0.9.3/24
        1 ----------- 2 ------------ 3
@@ -150,17 +158,16 @@ all:              do wathever is needed to setup all the links in the 'links' file.
 
 clean:         tear down all existing links
 
-L/N1-N2:       setup a link between nodes HOST_N1 and HOST_N2
+L/N1-N2:       setup a link between nodes $HOST_N1 and $HOST_N2
 
-U/N1-N2:       tear down the link (if it exists) between nodes HOST_N1
-               and HOST_N2
+U/N1-N2:       tear down the link (if it exists) between nodes $HOST_N1
+               and $HOST_N2
 
-del-bridge.N:  delete the bridge running on node HOST_N (this also tears down
-               all links that have an endpoint in N)
+del-bridge.N:  delete the bridge running on node $HOST_N (this also tears down
+               all links that have an endpoint in $HOST_N)
 
 graph.ps       create a postscript file containing a (simple) graphical
-               representation
-               of the current topology
+               representation of the current topology
 
 ====================================================