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Enable netfilter on bridges #269
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We were disabling it based on some documentation: http://docs.openstack.org/admin-guide-cloud/content/ch_introduction-to-openstack-compute.html ("Packet loss from instances to nova-network server (VLANManager mode)") and But it turns out this was misunderstood: the documentation was advising to do it only on the nova-network node (which would be the neutron l3 node today). On the compute nodes, we absolutely need netfilter on bridges to get security groups working. For now, we simply enable this everywhere as, based on testing, this doesn't seem to hurt us, and it should be safer this way on other nodes too.
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I remember debugging some months ago some complicated network problems with Dirk that came from a node NATing traffic that was supposed to be just bridged. maybe that was on a mkcloud host only, so would not make a difference... |
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Discussed face-to-face, no objection. |
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We were disabling it based on some documentation:
http://docs.openstack.org/admin-guide-cloud/content/ch_introduction-to-openstack-compute.html
("Packet loss from instances to nova-network server (VLANManager mode)") and
But it turns out this was misunderstood: the documentation was advising
to do it only on the nova-network node (which would be the neutron l3
node today). On the compute nodes, we absolutely need netfilter on
bridges to get security groups working.
For now, we simply enable this everywhere as, based on testing, this
doesn't seem to hurt us, and it should be safer this way on other nodes
too.