On Tue, Aug 30, 2016 at 8:28 PM, Numan Siddique <nusid...@redhat.com> wrote: > > > On Tue, Aug 30, 2016 at 9:40 AM, Ben Pfaff <b...@ovn.org> wrote: >> >> The patch will get reviewed, there's no need to ask again. >> >> On Tue, Aug 30, 2016 at 11:09:23AM +0800, Zong Kai Li wrote: >> > Hi, Numan and Justin. >> > I wish you can help review patch "allow DHCPv6 respond multiple IA >> > Address Options". >> > http://patchwork.ozlabs.org/patch/663493/ >> > >> > For current DHCPv6 implementation, it will respond one IPv6 address >> > for a lswitch port in a DHCPv6 Reply message. The "one IPv6 address", >> > I mean, one in the same address string, like "MAC IPv4-Address >> > IPv6-Address-1 IPv6-Address-2 ...". >> > >> > I don't think it's a good solution, since we can set multiple IA >> > Address Options in a DHCPv6 Reply message, and by that, we can support >> > multiple IPv6 addresses in the same address string for VIF port to >> > configure. It will give us a lflow with action=(reg0[3] = >> > put_dhcpv6_opts(ia_addr = OFFER_IP1, ia_addr = OFFER_IP2, ... , >> > server_id = MAC, OTHER_OPTS...); next;). This can work. >> > >> > In the patch mentioned above, I kept the CIDR checking, to make sure >> > at least one IPv6 address owned by lswitch port can reach DNS server >> > list in put_dhcpv6_opts action. >> > > > > I haven't reviewed the patch. But I have few comments. > A logical port can have multiple IPv6 addresses, out of which some can be > from a stateless subnet and some from stateful subnet. This doesn't handle > it right ? Correct me if I am wrong here. > > May be CMS can store the multiple IA_ADDR options in the > DHCP_Options.options so that ovn-northd doesn't need to bother about it. > > Thanks > Numan >
Yes, you're right, this changing doesn't handle that stateful and stateless addresses case. I didn't have a confident solution, so I made this changing aims to let all addresses belong to VM/VIF port can be get at first. I think store the multiple IA_ADDR options in the DHCP_Options.options is a good solution for ovn-northd, but not to CMS, it will lead DHCP_Options.options has higher maintain workload. Another idea is, allow Logical_Switch_Port.dhcpv6_options can have multiple refers than just one. Using this way to tell IPv6 addresses match DHCP_Options.cidr are stateful. It may be also possible to combine them into one, since dns server and domain in DHCP_Options referred by Logical_Switch_Port could be the same. That's all idea I get for now. Thanks and have a nice day. :) Zongkai LI _______________________________________________ dev mailing list dev@openvswitch.org http://openvswitch.org/mailman/listinfo/dev
