Hey guys, there is a functional spec for ipv6 that was started in the spring. No code is written as far as I a aware. It might be nice to review that and make changes to keep the spec ready, or just keep track of what cloudstack is planning so you can stay compatible if/when it lands. On Sep 5, 2014 7:53 AM, "Wido den Hollander" <w...@widodh.nl> wrote:
> > > On 05-09-14 12:42, Nux! wrote: > >> Hi, >> >> I've been thinking about this and apparently there is a big security >> problem with this idea, at least my colleagues from the network dept tell >> me so. >> If you want to use the router autoconfig thingy you must - as per current >> standards - use a /64 on the router interface and this way you expose >> yourself to a neighbour table attack - the neighbour table in avg cisco >> routers can hold tens of thousands of entries more or less, but it's still >> far from the trillions of addresses in a /64. This may seem far fetched but >> since 512k day, my colleagues don't want to take any more chances. :-) >> > > That only works if you actually spawn thousands of instances in that > subnet. > > One of the things people told me that you could overflow the neighbour > table by sending packets to bogus IPv6 addresses. > > I tried that some weeks ago on a Brocade and Extreme Networks router, but > they both have a system of "valid neighbours" and "pending neighbours". > > Only when a neighbour actually responded it goes into the "valid" table > and otherwise it is kicked out of the "pending" pretty quickly. > > I could not overflow any table or make them drop traffic to legitimate > hosts. > > They recommend to use DHCPv6 instead with far smaller subnets, which of >> course complicates things quite a bit on the cloudstack side... >> >> > Well, we would still need DHCPv6 to hand out additional options like DNS, > but yes. Since with the subnet + MAC you can calculate which IPv6 address > the Instance will use based on SLAAC. > > We can program that address into the security groups and that's the IPv6 > address the guest can use. > > Additional IPs is just a matter of generating a address, storing it and > adding it to the SG. > > So Router Advertisements are a very easy option to use. > > Any thoughts? >> >> Lucian >> >> -- >> Sent from the Delta quadrant using Borg technology! >> >> Nux! >> www.nux.ro >> >> ----- Original Message ----- >> >>> From: "John Kinsella" <j...@stratosec.co> >>> To: dev@cloudstack.apache.org >>> Sent: Wednesday, 20 August, 2014 11:59:27 PM >>> Subject: Re: IPv6 ~ Basic Network >>> >>> Please do - we started tinkering with ipv6 ages ago, never got it to >>> production, tho. >>> >>> On Aug 20, 2014, at 3:48 PM, Nux! <n...@li.nux.ro> wrote: >>> >>> Thanks Wido for the idea, then. :-) >>>> I'll gladly share it with you guys should I come up with something that >>>> works. >>>> >>>> Lucian >>>> >>>> -- >>>> Sent from the Delta quadrant using Borg technology! >>>> >>>> Nux! >>>> www.nux.ro >>>> >>>> >>>> ----- Original Message ----- >>>> >>>>> From: "Wido den Hollander" <w...@widodh.nl> >>>>> To: dev@cloudstack.apache.org >>>>> Sent: Wednesday, 20 August, 2014 9:36:48 PM >>>>> Subject: Re: IPv6 ~ Basic Network >>>>> >>>>> >>>>> >>>>> On 08/20/2014 10:07 PM, Nux! wrote: >>>>> >>>>>> Wido, >>>>>> >>>>>> Can you share your code for this? >>>>>> >>>>>> >>>>> Oh, I don't have any code. The setups I created have plain IPv6 without >>>>> any security grouping. >>>>> >>>>> My previous e-mail was just to illustrate what would be required. >>>>> >>>>> Wido >>>>> >>>>> Cheers >>>>>> >>>>>> -- >>>>>> Sent from the Delta quadrant using Borg technology! >>>>>> >>>>>> Nux! >>>>>> www.nux.ro >>>>>> >>>>>> >>>>> >>> >>> >>>
