Wouldn't something along the lines of this accomplish that?

        priority=1001,nw_src=10.0.0.10,action=drop
        priority=1000,nw_src=10.0.0.0/24,action=normal

--Justin


On Aug 17, 2011, at 10:38 AM, Masoud Moshref Javadi wrote:

> Thank you for your answer.
> Suppose that we have two rules: first, permits packet from 10.0.0.0/24 and 
> the other denies packets from 10.0.0.10 (with higher priority). Is there any 
> way to partition this space efficiently into non-overlapping rules?
> 
> On 8/17/2011 8:33 AM, Justin Pettit wrote:
>> There's support for IP address CIDR blocks.  Currently, there is no way to 
>> specify groups of ports; see the thread titled "Port range masking" on this 
>> list from a couple of weeks ago on the subject:
>> 
>>      http://openvswitch.org/pipermail/discuss/2011-August/005486.html
>> 
>> If you have thoughts on the subject, please respond to that thread.
>> 
>> --Justin
>> 
>> 
>> On Aug 17, 2011, at 6:04 AM, Masoud Moshref Javadi wrote:
>> 
>>> Is there any support for arbitrary ranges for rules, for IP addresses or 
>>> port/protocol numbers. I mean something like 10.0.0.0 to 10.0.0.10.
>>> If no, is there any plan for it?
>>> _______________________________________________
>>> discuss mailing list
>>> discuss@openvswitch.org
>>> http://openvswitch.org/mailman/listinfo/discuss

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