I think you might need to specify that it's IP traffic.  Try adding "ip" to 
your flow definition.

--Justin


> On Sep 8, 2016, at 7:38 PM, Warsang <wars...@minet.net> wrote:
> 
> Hello, I am trying to add a rule in ryu to drop packets where TTL=0.
> However in ovs when I use sudo ovs-ofctl -O OpenFlow14 add-flow 0_0_1 
> "nw_ttl=0 actions=DROP"
> 
> And then do: mininet@mininet-vm:~$ sudo ovs-ofctl dump-flows 0_0_1
> 
> I get NXST_FLOW reply (xid=0x4):
> cookie=0x0, duration=495.989s, table=0, n_packets=236, n_bytes=14160, 
> idle_age=3, priority=65535,dl_dst=01:80:c2:00:00:0e,dl_type=0x88cc 
> actions=CONTROLLER:65535
> cookie=0x0, duration=496.138s, table=0, n_packets=30, n_bytes=1260, 
> idle_age=680, priority=0 actions=CONTROLLER:65535
> cookie=0x0, duration=45.276s, table=0, n_packets=135, n_bytes=5670, 
> idle_age=363, actions=drop
> cookie=0x0, duration=1.943s, table=0, n_packets=0, n_bytes=0, idle_age=1, 
> priority=1,udp6 actions=dec_ttl
> 
> 
> And when I generate traffic, these packets are not dropped. Any idea why that 
> is? Thank you in advance.
> 
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