[ovs-discuss] flow rule for incoming GRE packets

[Rod N. Melton]

using mininet 2.1.0+ and OVS 2.1.0 

I have set up a GRE tunnel between two virtual machines.
VM1=192.168.56.103 and VM2 = 192.168.56.101. The tunnel works correctly;
i can ping the inner addresses from one side to the other. 

I can see that the GRE header is correct in wireshark. i can see that
when the ICMP packet comes out of the tunnel on VM2, the switch is using
reactive forwarding (PACKET_IN, PACKET_OUT to Floodlight controller) to
get the packet to its destination host. I would like to add a flow rule
to the switch on VM2 so that reactive
 forwarding is not used by the VM2 switch. I have tried many versions of
the following flow rule in VM2: 

sudo ovs-ofctl -O OpenFlow13 add-flow s2
cookie=5,ip,tun_dst=192.168.56.101/24,idle_timeout=90,actions=output:flood


i have tried matching on tun_id, tun_src, tun_dst but the incoming ICMP
is never taking my flow rule. Is it possible to match on a packet coming
GRE packet? What would i match on in the flow rule? 

Thanks, 

Rod Melton 
 
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