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From Wido den Hollander <>
Subject Re: IPv6 ideas for Basic Networking
Date Wed, 03 Jun 2015 18:36:40 GMT
Hash: SHA1

On 05/29/2015 09:59 PM, Suresh Ramamurthy wrote:
> Hi Wido,
> After reading your IPv6 ideas for Basic Networking, I realized that
> couple of them can be reused for Advanced Networking too.

Great! Like which parts? I guess there is a big overlap between
Advanced and Basic networking.

> We have come up with a proposal for IPv6 support in VPC and it is
> posted in wiki
>  Did you get a chance to look at it? Let me know your feedback on
> the DD.

No, I didn't, but I really should!

> I work from bay area, so I will not be able to attend the meetup
> at Amsterdam. But, I would like to have a call/chat with you to
> discuss on further details about IPv6 support.
> I would like to schedule a conference call with you. Would you be
> available for the call?

Yes, that seems like a good idea. I'm heading off on vacation and it
won't be until around June 20th before I'll be available.


> Thanks, Suresh
> On Sat, May 23, 2015 at 11:18 PM, Remi Bergsma
> <> wrote:
>> At Schuberg Philis we’ve been working on a design voor IPv6 in
>> VPC networks (so this is Advanced Networking) and I indeed had a
>> look at your functional spec. I’ll finalise what we’ve come up
>> with and publish it early next week so we can align and discuss
>> and work from there. Nice to see there is a design for Basic
>> Networking as well!
>> Regards, Remi
>>> On 24 May 2015, at 02:47, Marcus <> wrote:
>>> Did you guys review the functional spec that has been floating
>>> around on cwiki? On May 23, 2015 8:27 AM, "Wido den Hollander"
>>> <> wrote:
> On 05/22/2015 11:05 PM, server24 Cloudstack wrote:
>>>>>> Hi Wido,
>>>>>> was nice talking to you about this.
>>>>>> On 5/21/2015 8:59 PM, Wido den Hollander wrote:
>>>>>>> (IPv6) routers should send out RAs (Router
>>>>>>> Advertisements) with the managed-other-flag [0][1],
>>>>>>> telling Instances to ONLY use that routers as their
>>>>>>> default gateways and NOT to use SLAAC to autoconfigure
>>>>>>> their IP-Address.
>>>>>> OK, so no autonomous flag
> No, the "managed other flag" as described in RFC 4862. Meaning
> that the Routers should only be used as a default gateway and
> DHCPv6 should be used for obtaining a address.
>>>>>>> The (ip6tables) Security Groups should allow ICMPv6 by
>>>>>>> default. IPv6 traffic breaks really hard without ICMPv6
>>>>>>> traffic, for example PMTU doesn't work properly and
>>>>>>> breaks IPv6 connections.
>>>>>> yes, and default ip(6)tables should be in place to block 
>>>>>> VNC-related traffic except to the Virtual Console (as
>>>>>> currently VNC ports on IPv6 are world-wide-open in BASIC
>>>>>> network)!
> Yes, but in that case you are talking about the Console Proxy
> which should be firewalled properly.
>>>>>>> In CloudStack we might configure a /48, but tell it to
>>>>>>> hand out addresses for each instance from a /64 out of
>>>>>>> that /48. That means we can have 65k Instances in that
>>>>>>> pod. Some firewall policies block a complete /64 when
>>>>>>> they see malicious traffic coming from that subnet, so
>>>>>>> if the subnet is big enough we should try to keep all
>>>>>>> the IPv6 addresses from one Instance in the same /64
>>>>>>> subnet. This could also simplify the iptable rules.
>>>>>> so one /48 per pod? RIRs provide either /48 or /32 (the
>>>>>> latter to the providers) IPv6 blocks. So this should then
>>>>>> be configurable, both per instance and per pod. One /48
>>>>>> per pod still looks large to me..
> A /48 should be a possibility. If you only have a /64 available
> that should be no problem either.
>>>>>> On the other hand any prefix more specific than /64 could
>>>>>> break IPv6 features, so that there are at least some
>>>>>> practical values to rely on.
>>>>>>> Security grouping has to be extended to also support
>>>>>>> IPv6, but should allow ICMPv6 by default.
>>>>>> yes, ICMPv6 should be on by default (maybe it should be
>>>>>> forced to be always on for IPv6?).
>>>>>>> At the end of June 2015 we want to keep a one-day
>>>>>>> meetup in Amsterdam with various developers to discuss
>>>>>>> some more details.
>>>>>> great work and very good meeting, was a pleasure to be
>>>>>> there.
>>>>>> Thomas Moroder
>>>>>> -- Incubatec GmbH - Srl Via Scurcia'str. 36, 39046
>>>>>> Ortisei(BZ), ITALY Registered with the chamber of
>>>>>> commerce of Bolzano the 8th of November 2001 with REA-No.
>>>>>> 168204 (s.c. of EUR 10.000 f.p.u.) President: Thomas
>>>>>> Moroder, VAT-No. IT 02283140214 Tel: +39.0471796829 -
>>>>>> Fax: +39.0471797949
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