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</o:shapelayout></xml><![endif]--></head><body lang=FR link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>Hi All,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>I am trying to wrap my head around something I came across in one of the OpenStack deployments. I am running Telco VNFs one of them is having different VMs using SR-IOV interfaces. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>On one of my VNFs on Openstack, I defined a wrong IPv6 Gm bearer interface to be exactly the same as the IPv6 Gateway. As I hate re-onboarding, I decided to embark on a journey of changing the IPv6 of the Gm bearer interface manually on the application side, everything went on fine.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>After two weeks, my customer started complaining about one way RTP flow. The customer was reluctant to blame the operation I carried out because everything worked smooth after my modification. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>After days of investigation, I remembered that I have port-security enabled and this means AAP “Allowed-Address-Pairs” are defined per vPort (AAP contain the floating IP address of the VM so that the security to allow traffic to and from this VIP). I gave it a try and edited AAP “Allowed-Address-Pairs” to include the correct new IPv6 address. Doing that everything started working fine.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>The only logical explanation at that time is security group rules are really invoked. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>Now, I am trying to understand how the iptables are really invoked. I did some digging and it seems like we can control the firewall drivers on two levels:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><ul style='margin-top:0cm' type=disc><li class=MsoListParagraph style='margin-left:0cm;mso-list:l0 level1 lfo1'><span lang=EN-US style='mso-fareast-language:EN-US'>Nova compute <o:p></o:p></span></li><li class=MsoListParagraph style='margin-left:0cm;mso-list:l0 level1 lfo1'><span lang=EN-US style='mso-fareast-language:EN-US'>ML2 plugin<o:p></o:p></span></li></ul><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>I was curious to check nova.conf and it has already the following line: firewall_driver=nova.virt.firewall.NoopFirewallDriver<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>However, checking the ml2 plugin configuration, the following is found:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'> 230 [securitygroup]<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'> 231<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'> 232 #<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'> 233 # From neutron.ml2<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'> 234 #<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'> 235<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'> 236 # Driver for security groups firewall in the L2 agent (string value)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'> 237 #firewall_driver = <None><o:p></o:p></span></p><p class=MsoNormal><b><span lang=EN-US style='color:red;mso-fareast-language:EN-US'> 238 firewall_driver = openvswitch<o:p></o:p></span></b></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>So, I am jumping to a conclusion that ml2 plugin is the one responsible for enforcing the firewall rules in my case.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>Have you had a similar experience?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>Is my assumption correct: If I comment out the ml2 plugin firewall driver then the port security carries no sense at all and security groups won’t be invoked?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>Cheers,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'>Ahmed</span><span lang=EN-US><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:EN-US'><o:p> </o:p></span></p></div></body></html>