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This installation guide is:
http://docs.openstack.org/juno/install-guide/install/yum/content/neutron-network-node.html#treeDiv

In Centos 7,controle node and network node in one machine.my output is:
[root at controller-59 ~]# cat /proc/sys/net/ipv4/ip_forward
1
[root at controller-59 ~]# cat /proc/sys/net/ipv4/conf/all/rp_filter
0
[root at controller-59 ~]# cat /proc/sys/net/ipv4/conf/default/rp_filter
0


2015-11-13 18:01 GMT+08:00 Akihiro Motoki <amotoki at gmail.com>:

> Could you share the exact place of the installation guide?
> I would like to check it.
>
> Are you talking about the network node?
>
> I think these settings are required when you configure a network node
> without network namespace.
>
> If we use network namespace in a network node, I don't think we need
> these settings in a host of a network node.
> ip_forward=1 is set automatically in a router network namespace.
>
> I checked my Juno production environment  with network namespace, I
> see the following in a host level.
> It uses Ubuntu 14.04.
>
> $ cat /proc/sys/net/ipv4/ip_forward
> 0
> $ cat /proc/sys/net/ipv4/conf/all/rp_filter
> 1
> $ cat /proc/sys/net/ipv4/conf/default/rp_filter
> 1
>
> Akihiro
>
> 2015-11-13 18:51 GMT+09:00 JinXing F <jinxing.f at gmail.com>:
> > 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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