Some improvements to the sample script.

examples/sample.py

@@ -2,6 +2,9 @@
 # vim:ts=4:sw=4:et:ai:sts=4
 import os, nemu, subprocess, time
 
+# Uncomment for verbose operation.
+#nemu.environ.set_log_level(nemu.environ.LOG_DEBUG)
+
 xterm = nemu.environ.find_bin("xterm")
 X = "DISPLAY" in os.environ and xterm
 
@@ -54,7 +57,9 @@ ret = app1.wait()
 assert ret == 0
 print "Connectivity IPv4 OK!"
 
+# Some nice visual demo.
 if X:
+    print "Running ping and tcpdump in different nodes."
     app1 = node1.Popen("%s -geometry -0+0 -e %s -ni %s" %
             (xterm, nemu.environ.TCPDUMP_PATH, if1b.name), shell = True)
     time.sleep(3)
@@ -64,9 +69,9 @@ if X:
     app1.signal()
     app1.wait()
 
-# Now test the network conditions
+print "Running network conditions test."
 # When using a args list, the shell is not needed
-app2 = node2.Popen(["ping", "-q", "-c100000", "-f", "10.0.1.2"],
+app2 = node0.Popen(["ping", "-q", "-c1000", "-f", "10.0.1.2"],
         stdout = subprocess.PIPE)
 
 out, err = app2.communicate()