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Yes,I don't understand why Neutron needs enable ip_forward and disable RPF.
And I also don't understand where the neutron need this config during the
instance connect to the extrernal network.

I read the neutron code, found when the L3 agent creating, it needs the
ip_forward config,but i'm not find the RPF config in the neutron code.

Thank you very much!


2015-11-11 18:25 GMT+08:00 JinXing F <jinxing.f at gmail.com>:

> Hi, guys:
>
>     during the neutron installation guide, I found that we need to config
> the linux kernel as bellow:
>
> net.ipv4.ip_forward=1
>
> net.ipv4.conf.all.rp_filter=0
>
> net.ipv4.conf.default.rp_filter=0
>
>
> the first one is the ip address translation between LAN and WLAN, the
> second and third command is used for "Reverse Path Filtering".
>
> I cann't understand the purpose of the config in the neutron.
>
> 1. If the instance in compute node connect with exteral network,what's the
> function of the three config?
>
> 2. The instance connect with each others, what's the function of the three
> config?
>
>
> I am very confused about this config.Please explain the answer to me.
>
> Thanks.
>
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