On 11/11/15 10:30, JinXing F wrote: > > 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, >
No, that's incorrect. net.ipv4.ip_forward simply allows Linux to forward IPv4 packets - i.e. to receive a packet on one network interface, determine that it is not a packet that should be delivered locally, and forward it on to its next IP hop. There is no IP address translation involved here. > the second and third command is used for "Reverse Path Filtering". > > I cann't understand the purpose of the config in the neutron. > Do you mean that you don't understand what "Reverse Path Filtering" is? Or that you don't understand why Neutron needs RPF to be disabled? For the former, please see https://en.wikipedia.org/wiki/Reverse_path_forwarding. Regards, Neil > 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. > __________________________________________________________________________ OpenStack Development Mailing List (not for usage questions) Unsubscribe: openstack-dev-requ...@lists.openstack.org?subject:unsubscribe http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
