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</o:shapelayout></xml><![endif]--></head><body lang=ZH-CN link="#0563C1" vlink="#954F72" style='text-justify-trim:punctuation'><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Hi, folks<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I saw somebody discussed distributed SNAT, but finally they didn’t make agreement on how to implement distributed SNAT, my question is can we use dvr_snat agent_mode in compute node? I understand dvr_snat only does snat but doesn’t do east west routing, right? Can we set dvr_snat and dvr in one compute node at the same time? It is equivalent to distributed SNAT if we can set drv_snat in every compute node, isn’t right? I know Opendaylight can do SNAT in compute node in distributed way, but one external router only can run in one compute node.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I also see <a href="https://wiki.openstack.org/wiki/Dragonflow">https://wiki.openstack.org/wiki/Dragonflow</a> is trying to implement distributed SNAT, what are technical road blocks for distributed SNAT in openstack dvr? Do we have any good way to remove these road blocks?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Thank you in advance and look forward to getting your replies and insights.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Also attached official drv configuration guide for your reference.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><a href="https://docs.openstack.org/neutron/stein/configuration/l3-agent.html">https://docs.openstack.org/neutron/stein/configuration/l3-agent.html</a><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal align=left style='text-align:left'><code><span lang=EN-US style='font-size:12.0pt'>agent_mode</span></code><span lang=EN-US><a href="https://docs.openstack.org/neutron/stein/configuration/l3-agent.html#DEFAULT.agent_mode" title="Permalink to this definition">¶</a><o:p></o:p></span></p><p class=MsoNormal style='margin-left:36.0pt'><span lang=EN-US>Type<o:p></o:p></span></p><p style='margin-left:36.0pt'><span lang=EN-US>string<o:p></o:p></span></p><p class=MsoNormal style='margin-left:36.0pt'><span lang=EN-US>Default<o:p></o:p></span></p><p style='margin-left:36.0pt'><span class=pre><span lang=EN-US>legacy</span></span><span lang=EN-US><o:p></o:p></span></p><p class=MsoNormal style='margin-left:36.0pt'><span lang=EN-US>Valid Values<o:p></o:p></span></p><p style='margin-left:36.0pt'><span lang=EN-US>dvr, dvr_snat, legacy, dvr_no_external<o:p></o:p></span></p><p style='margin-left:36.0pt'><span lang=EN-US>The working mode for the agent. Allowed modes are: ‘legacy’ - this preserves the existing behavior where the L3 agent is deployed on a centralized networking node to provide L3 services like DNAT, and SNAT. Use this mode if you do not want to adopt DVR. ‘dvr’ - this mode enables DVR functionality and must be used for an L3 agent that runs on a compute host. ‘dvr_snat’ - this enables centralized SNAT support in conjunction with DVR. This mode must be used for an L3 agent running on a centralized node (or in single-host deployments, e.g. devstack). ‘dvr_no_external’ - this mode enables only East/West DVR routing functionality for a L3 agent that runs on a compute host, the North/South functionality such as DNAT and SNAT will be provided by the centralized network node that is running in ‘dvr_snat’ mode. This mode should be used when there is no external network connectivity on the compute host.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>