diff --git a/README.md b/README.md
index 6975a2a..aa5ecc4 100644
--- a/README.md
+++ b/README.md
@@ -95,6 +95,7 @@ end
 ```
 
 > Due to the dynamic nature of the subnet reserved on Grid'5000, IPs of the VMs will change accross reboots
+> a /18 is reserved but only the first 1024 ips are reserved for the VMs. That means you can use the remaining ips without any conflict.
 
 ## Note on resource demand
 
diff --git a/lib/vagrant-g5k/network/bridge.rb b/lib/vagrant-g5k/network/bridge.rb
index 5407ee2..dfca044 100644
--- a/lib/vagrant-g5k/network/bridge.rb
+++ b/lib/vagrant-g5k/network/bridge.rb
@@ -5,7 +5,7 @@ module G5K
     module Network
 
       class Bridge
-      
+
         include VagrantPlugins::G5K
 
         def initialize(env, driver, oar_driver)
@@ -21,7 +21,7 @@ def initialize(env, driver, oar_driver)
         def generate_net()
           lockable(:lock => VagrantPlugins::G5K.subnet_lock) do
             subnet_job_id = _find_subnet
-            if subnet_job_id.nil? 
+            if subnet_job_id.nil?
               subnet_job_id = _create_subnet
               @oar_driver.wait_for(subnet_job_id)
               # we can't call this inside the launcher script
@@ -33,7 +33,7 @@ def generate_net()
           return "BRIDGE #{_subnet_file}"
           end
         end
-      
+
         def check_state(job_id)
           subnet_job_id = _find_subnet()
           return :subnet_missing if subnet_job_id.nil?
@@ -69,7 +69,7 @@ def _cwd()
         def _create_subnet()
           options = []
           options << "--name '#{@project_id}-net'"
-          options << "-l 'slash_22=1, walltime=#{@walltime}'"
+          options << "-l 'slash_18=1, walltime=#{@walltime}'"
           @oar_driver.submit_job('sleep 84400', options )
         end
 
@@ -87,10 +87,10 @@ def _find_subnet()
           nil
         end
 
-        # Update the subnet use 
+        # Update the subnet use
         # op is a string "+" or "-"
-        # if after the update the subnet use is 0 
-        # the subnet in use is also deleted 
+        # if after the update the subnet use is 0
+        # the subnet in use is also deleted
         def _update_subnet_use(op)
           cmd = []
           cmd << "c=$(cat #{_subnet_count});"
@@ -98,7 +98,7 @@ def _update_subnet_use(op)
           cmd << "cat #{_subnet_count}"
           count = @driver.exec(cmd.join(" "))
           @logger.info("subnet_count = #{count}")
-          if count.to_i <= 0 
+          if count.to_i <= 0
             @logger.info("deleteting the associated subnet")
             subnet_id = _find_subnet()
             @oar_driver.delete_job(subnet_id)
@@ -111,5 +111,3 @@ def _update_subnet_use(op)
     end
   end
 end
-
-  
diff --git a/lib/vagrant-g5k/util/launch_vm.sh b/lib/vagrant-g5k/util/launch_vm.sh
index 30767a2..530b66f 100755
--- a/lib/vagrant-g5k/util/launch_vm.sh
+++ b/lib/vagrant-g5k/util/launch_vm.sh
@@ -2,7 +2,7 @@
 
 # This script is originally borrowed to pmorillo
 # Thanks to him !
-# I've made some addition though :) 
+# I've made some addition though :)
 
 # ARGS
 # $1: cpu demand
@@ -17,7 +17,7 @@ set -x
 function net_bridge() {
   SUBNET_FILE=$1
   # As we chose a stateless designe,let's calculate here the ip and mac
-  # assuming we got a slash_22
+  # assuming we got at least a slash_22
   ipnumber=$(($OAR_JOB_ID % 1022))
   IP_MAC=$(cat $SUBNET_FILE|head -n $((ipnumber + 1))|tail -n 1)
   IP_ADDR=$(echo $IP_MAC|awk '{print $1}')