Added README.

Modified cleanup to use dpctl to remove kernel datapaths.

README

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+
+	Mininet: A Simple Virtual Testbed for OpenFlow
+						aka
+How to Squeeze a 1024-node OpenFlow Network onto your Laptop
+
+(Extremely Experimental Development Version 0.1, December 2009)
+
+---
+
+Mininet creates simple OpenFlow test networks by using process-based
+virtualization and network namespaces.
+
+Simulated hosts (as well as switches and controllers with the user datapath)
+are created as processes in separate network namespaces. This allows a
+complete OpenFlow network to be simulated on top of a single Linux kernel.
+
+In order to run Mininet, you must have:
+
+* A Linux 2.6.26 or greater kernel compiled with network namespace support
+  enabled. (Debian-testing should work.)
+
+* The OpenFlow reference implementation (either the user or kernel datapath
+  may be used, and the tun or ofdatapath kernel modules must be loaded,
+  respectively)
+
+* Python, Bash, etc.
+
+* Root privilieges (required for network device access)
+
+* The netns program or equivalent (included as netns.c)
+
+Currently mininet includes:
+
+	A simple node infrastructure (Host, Switch, Controller classes) for
+	creating virtual OpenFlow networks.
+	
+	A simple network infrastructure (class Network and its descendants
+	TreeNet, GridNet and LinearNet) for creating scalable topologies and
+	running experiments (using someNetwork.run( test ) )
+	
+	Some simple tests which can be run by someNetwork.run( test )
+	
+	A simple command-line interface which may be invoked on a network
+	using .run( Cli )
+	
+	Examples (in examples/ directory) to help you get started.
+	
+Notes and Advice:
+
+For scalable configurations, you may need to increase some of your kernel
+limits. For example, you could add something like the following to
+/etc/sysctl.conf:
+
+# OpenFlow: get rid of ipv6
+net.ipv6.conf.all.disable_ipv6 = 1
+net.ipv6.conf.default.disable_ipv6 = 1
+
+# Mininet: Increase open file limit
+fs.file-max = 100000
+
+# Mininet: increase network buffer space
+net.core.wmem_max = 16777216
+net.core.rmem_max = 16777216
+net.ipv4.tcp_rmem = 10240 87380 16777216
+net.ipv4.tcp_rmem = 10240 87380 16777216
+net.core.netdev_max_backlog = 5000
+
+# Mininet: increase arp cache size
+net.ipv4.neigh.default.gc_thresh1 = 4096 
+net.ipv4.neigh.default.gc_thresh2 = 8192 
+net.ipv4.neigh.default.gc_thresh3 = 16384
+
+# Mininet .... and increase routing table size
+net.ipv4.route.max_size=32768
+
+---
+Bob Lantz
+rlantz@cs.stanford.edu
+
+