FAQ: Add another question about do-nothing flows.
Acked-by: Gurucharan Shetty
@@ -496,6 +496,27 @@ but the packets are actually being output in VLAN 123. Why?
$ ovs-ofctl add-flow br0 dl_vlan=123,actions=mod_vlan_vid:456,output:1
+ See also the following question.
+
+Q: I added a flow to a redirect packets for TCP port 80 to port 443,
+like so::
+
+ $ ovs-ofctl add-flow br0 tcp,tcp_dst=123,actions=mod_tp_dst:443
+
+but the packets are getting dropped instead. Why?
+
+ A: This set of actions does change the TCP destination port to 443, but
+ then it does nothing more. It doesn't, for example, say to continue to
+ another flow table or to output the packet. Therefore, the packet is
+ dropped.
+
+ To solve the problem, add an action that does something with the modified
+ packet. For example::
+
+ $ ovs-ofctl add-flow br0 tcp,tcp_dst=123,actions=mod_tp_dst:443,normal
+
+ See also the preceding question.
+
Q: The "learn" action can't learn the action I want, can you improve it?
A: By itself, the "learn" action can only put two kinds of actions into the
