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<p class="MsoNormal">Hi Everyone,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hope you are all doing well.<o:p></o:p></p>
<p class="MsoNormal">I’m a beginner to Openstack and Neutron and now run into an issue about SNAT and shared floating IP.<o:p></o:p></p>
<p class="MsoNormal">I’ve already deployed a neutron network which use BGP to announce floating IP to PE (Provider Edge router), and everything works as expected when I assigned the public floating IP (e.g., 123.0.0.10/24) to VMs.
<o:p></o:p></p>
<p class="MsoNormal">But when I tried to use floating IP port-forwarding function with floating IP 123.0.0.20/24 and rule (internal_ip 10.10.10.10, internal_port 5555, external_port 64000), and assign a private IP (10.10.10.10/24) to a VM. The floating IP 123.0.0.20
won’t be advertised through BGP.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">May I have some suggestions about how could I get this fixed, or the neutron just won’t work this way?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">FYI,<o:p></o:p></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Per my understanding, the port_forwardings rule will make the port acts like a SNAT role and forward any packets that reached to it with destination 123.0.0.20:64000 to the private
IP 10.10.10.10/24. <o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">The IP address could be reached in the neutron network.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">PE IP address, CE IP address, and floating IP gateway are using the same subnet A and subnet pool (192.168.123.0/24), while floating IP belongs to subnet B and subnet pool (123.0.0.0/24),
both subnets belong to provider network.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Only floating IP that assigned to the specific VM will be advertised to PE through BGP<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Floating IP that assigned to port of a router in the neutron network won’t be advertised, even the IP is activated and is reachable internally.<o:p></o:p></li></ol>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal">Sincerely,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Alex<o:p></o:p></p>
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