why are the sysctl rules for reverse patch filtering and ip forwarding required for neutron ml2?

asked 2014-06-10 17:09:00 -0500

bodepd2 gravatar image

I verified the following http://docs.openstack.org/icehouse/install-guide/install/apt/content/neutron-ml2-network-node.html (documentation) against my current installation of neutron ml2 with ovs. It mentions the following sysctl rules:

  • net.ipv4.ip_forward=1
  • net.ipv4.conf.all.rp_filter=0
  • net.ipv4.conf.default.rp_filter=0

I am not using these rules, yet, my networking seems to be working as expected.

What exact functionality are these rules required for?

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