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Neutron already supports L3 router with network namespaces which send
notifications, as Armando mentioned.
Ceilometer can consume these notification and I think monisca can do
similar things.
I believe you can collect enough information for neutron ovs implementation.

2016-04-25 13:20 GMT-05:00 Rubab Syed <rubab.syed21 at gmail.com>:
> Hi folks,
>
> I'm writing a plugin for Monasca to monitor traffic at layer 3. My Neutron
> backend is OVS and I'm using iptables of network namespaces for getting
> traffic counters. Would the following rules in router namespace cover all
> the traffic at layer 3 per router per tenant?
>
> - Chain MONASCA-INPUT in filter table
>    - src: anywhere     dest: gateway port IP   // north-south traffic for
> SNATed and FIPs
>
> - Chain MONASCA-FORWARD in filter table
>   - src: anywhere       dest: anywhere          // east-west traffic
> inter-network and intra-network
>
> - Chain MONASCA-OUTPUT in filter table
>   - src: gateway port     dest: anywhere      // north-south traffic from
> VMs to public network
>
>
> Would these be sufficient or am I missing something?
>
> Thanks!
>
> Rubab
>
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