> On Sep 12, 2015, at 6:21 AM, Seyyed Hesamoddin Ghasemi 
> <[email protected]> wrote:
> 
> Why not? As I know OVS have access to all header fields in layer 2 to layer 
> 4! 

We don't provide the ability to match on sequence numbers because they're not 
generally very useful for forwarding decisions, and it would have a horrible 
impact on performance.

> How can I Implement a simple proxy using OVS? I mean, how can get packet from 
> a source node and send it to a destination node in a transparent manner?
> 
> I need to get first 4 packet of a tcp session in the controller (as a proxy) 
> and then forward the rest of packets using OVS without intervention of the 
> controller and with keep current tcp session. How can I do that? 

As Gal mentioned, I think the way to do it is by building on the conntrack 
work.  Some of the developers at VMware are starting to think about how to add 
that support to OVS.  Adding load-balancing will probably be built on top of 
NAT support, which will be built on conntrack.  If you're interested in doing 
this work yourself, I'd recommend looking into that, too.

--Justin



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