[pve-devel] openflow firewall

Alexandre DERUMIER aderumier at odiso.com
Sun Dec 29 14:16:59 CET 2013


>>I have done some research now, and it seem the we can only implement 
>>a stateless firewall with openflow.

Yes, I see also that. That why I would like to see performance.
But it seem that only first packet of a flow is going to the controller.

(But I don't known what is the size of a flow ? how many packets ?)

>>Some recent OVS addition allows at least 
>>to match tcp_flags, but this is not comparable with real (iptables) connection 
>>tracking. I will do further tests. 

Yes, this is also discussed here :
https://wiki.openstack.org/wiki/Neutron/blueprint_ovs-firewall-driver

"My preferred implementation is 'stateless ACLs with tcp_flags=ack' to emulate stateful behavior (at least in TCP) because reflexive learning is not as performant."

----- Mail original ----- 

De: "Dietmar Maurer" <dietmar at proxmox.com> 
À: "Alexandre DERUMIER (aderumier at odiso.com)" <aderumier at odiso.com> 
Cc: pve-devel at pve.proxmox.com 
Envoyé: Samedi 28 Décembre 2013 16:12:09 
Objet: openflow firewall 



I have done some research now, and it seem the we can only implement 
a stateless firewall with openflow. Some recent OVS addition allows at least 
to match tcp_flags, but this is not comparable with real (iptables) connection 
tracking. I will do further tests. 


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