Signed-off-by: Ben Pfaff <[email protected]>
---
FAQ | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/FAQ b/FAQ
index d36495c..14fb1c0 100644
--- a/FAQ
+++ b/FAQ
@@ -1235,9 +1235,11 @@ A: To debug network behavior problems, trace the path of
a packet,
Q: How do I make a flow drop packets?
-A: An empty set of actions causes a packet to be dropped. You can
- specify an empty set of actions with "actions=" on the ovs-ofctl
- command line. For example:
+A: To drop a packet is to receive it without forwarding it. OpenFlow
+ explicitly specifies forwarding actions. Thus, a flow with an
+ empty set of actions does not forward packets anywhere, causing
+ them to be dropped. You can specify an empty set of actions with
+ "actions=" on the ovs-ofctl command line. For example:
ovs-ofctl add-flow br0 priority=65535,actions=
@@ -1249,6 +1251,9 @@ A: An empty set of actions causes a packet to be dropped.
You can
ovs-ofctl add-flow br0 priority=65535,actions=drop
+ "drop" is not an action, either in OpenFlow or Open vSwitch.
+ Rather, it is only a way to say that there are no actions.
+
Q: I added a flow to send packets out the ingress port, like this:
ovs-ofctl add-flow br0 in_port=2,actions=2
--
1.7.10.4
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