tests: Add sFlow test.

[sliver-openvswitch.git] / INSTALL.userspace

diff --git a/INSTALL.userspace b/INSTALL.userspace
index a0c6a26..296f077 100644 (file)
--- a/INSTALL.userspace
+++ b/INSTALL.userspace
@@ -17,7 +17,7 @@ Building and Installing
 -----------------------
 
 The requirements and procedure for building, installing, and
 -----------------------
 
 The requirements and procedure for building, installing, and

-configuring Open vSwitch are the same as those given in INSTALL.Linux.
+configuring Open vSwitch are the same as those given in INSTALL.

 You may omit configuring, building, and installing the kernel module,
 and the related requirements.
 
 You may omit configuring, building, and installing the kernel module,
 and the related requirements.
 


@@ -31,19 +31,38 @@ The tun device must also exist as /dev/net/tun.  If it does not exist,
 then create /dev/net (if necessary) with "mkdir /dev/net", then create
 /dev/net/tun with "mknod /dev/net/tun c 10 200".
 
 then create /dev/net (if necessary) with "mkdir /dev/net", then create
 /dev/net/tun with "mknod /dev/net/tun c 10 200".
 

-Using the Userspace Datapath
-----------------------------
+On FreeBSD, the userspace switch additionally requires the kernel
+tap(4) driver to be available, either built into the kernel or loaded
+as a module.

 
 

-To use ovs-vswitchd in userspace mode, give the bridge a name that
-begins with "netdev:" in the configuration file.  For example:
+Using the Userspace Datapath with ovs-vswitchd
+----------------------------------------------

 
 

-    bridge.netdev:br0.port=eth0
-    bridge.netdev:br0.port=eth1
-    bridge.netdev:br0.port=eth2
+To use ovs-vswitchd in userspace mode, create a bridge with datapath_type
+"netdev" in the configuration database.  For example:
+
+    ovs-vsctl add-br br0
+    ovs-vsctl set bridge br0 datapath_type=netdev
+    ovs-vsctl add-port br0 eth0
+    ovs-vsctl add-port br0 eth1
+    ovs-vsctl add-port br0 eth2

 
 ovs-vswitchd will create a TAP device as the bridge's local interface,
 
 ovs-vswitchd will create a TAP device as the bridge's local interface,

-named the same as the bridge minus the "netdev:" prefix, as well as
-for each configured internal interface.
+named the same as the bridge, as well as for each configured internal
+interface.
+
+Firewall Rules
+--------------
+
+On Linux, when a physical interface is in use by the userspace
+datapath, packets received on the interface still also pass into the
+kernel TCP/IP stack.  This can cause surprising and incorrect
+behavior.  You can use "iptables" to avoid this behavior, by using it
+to drop received packets.  For example, to drop packets received on
+eth0:
+
+    iptables -A INPUT -i eth0 -j DROP
+    iptables -A FORWARD -i eth0 -j DROP

 
 Bug Reporting
 -------------
 
 Bug Reporting
 -------------