[ovs-discuss] Proxy ARP

[David F. Sire]

Thank you.

David


2014-08-26 11:11 GMT+02:00 Lori Jakab <lojakab at cisco.com>:

> On 8/26/14 12:08 PM, David F. Sire wrote:
>
>> Thans for your reply.
>>
>> It's very helpful.
>>
>>
>> Note : It does not matter now but what wanted to do is to add a module in
>> the Open vSwitch code simulating ARP proxy for LISP tunnels. I read and
>> understood the code but I wonder if this module must be enable for all
>> vports in datapath or just for LISP vport.
>>
>
> Only for LISP vports, since they give you a layer 3 overlay and don't
> forward ARP traffic.
>
> -Lori
>
>
>> Please could you give me some guidance. Maybe I will do it later so I
>> won't use mininet scripts to automatically install flow rules
>>
>> Thanks a lot,
>>
>> David
>>
>>
>>
>> 2014-08-25 12:34 GMT+02:00 Lori Jakab <lojakab at cisco.com <mailto:
>> lojakab at cisco.com>>:
>>
>>
>>     On 8/24/14 5:47 AM, David F. Sire wrote:
>>
>>         Hi,
>>
>>         I'm using LISP tunnels in Openvswitch and I read in REAME-lisp
>>         that if "the VMs have IP addresses in the same subnet but the
>>         hypervisors are separated by a router" in the network
>>         topology, we need an ARP proxy.
>>
>>
>>     Can you give us more detail about what you are trying to do?
>>  Unless you really really want to work on an ARP proxy internal to
>>     OVS, there may be other solutions.
>>
>>     For example, you could use /32 (v4) or /128 (v6) addresses in your
>>     VMs to avoid having two communicating hosts being in the same
>>     subnet and sending ARP requests if the first place.
>>
>>     Alternatively, if you use an external controller, or you have a
>>     static environment, you can implement an “ARP responder” with flow
>>     rules only, as is done by OpenStack:
>>
>>     https://wiki.openstack.org/wiki/Ovs-flow-logic#OVS_flows_
>> logic_with_local_ARP_responder
>>
>>     You can find detailed examples in the following blog post, look
>>     for Table 105 - ARP responder:
>>
>>     http://dtucker.co.uk/hack/building-a-router-with-openvswitch.html
>>
>>     Let us know if this helps with your use case, or please describe
>>     what you’re trying to achieve.
>>
>>     HTH,
>>     -Lori
>>
>>
>>
>>         What i want to do is to add this proxy in the code.
>>
>>         I have no idea how to do it.
>>
>>         Any help will be appreciated.
>>
>>         Thanks,
>>         David
>>
>>
>>
>
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