[Planetlab-devel] IPv6 support for MyPLC

[Marc E. Fiuczynski]

Hi Jim,

It is true that each PL node only has one IPv4 address.  We then do some
special port isolation so that the different slivers can safely share this
single IPv4 address.

It is correct that basic autoconf for a single IPv6 address for the physical
host is part of Linux etc..  Autoconf'ing this IPv6 address is a no
brainer!!! This will give the host a single IPv6 address. However, the main
purpose for adding IPv6 support is to give each sliver its own, unique,
globally addressable IPv6 address.  So while each host will only have a
single IPv4 address, it will have many IPv6 addresses (one per sliver in
addition to the one assigned to the physical host).

Hope this clarifies things.

Marc


> -----Original Message-----
> From: devel-bounces at planet-lab.org
> [mailto:devel-bounces at planet-lab.org]On Behalf Of Bound, Jim
> Sent: Thursday, November 09, 2006 12:49 PM
> To: Marc E. Fiuczynski; devel at lists.planet-lab.org
> Subject: RE: [Planetlab-devel] IPv6 support for MyPLC
>
>
> Hi Marc,
>
> OK I must be dreaming and don't have the time now to chase all the
> mails.  But I thought I heard someone say each host had multiple IPv4
> addresses.  Now that you state this suggest PLL simply use stateless
> addr conf and get the IPv6 host address from a range of routers in the
> market that can do this.  As you well pointed out the next step is
> putting in the DNS but that is part II.
>
> thanks
> /jim
>
> > -----Original Message-----
> > From: Marc E. Fiuczynski [mailto:mef at CS.Princeton.EDU]
> > Sent: Thursday, November 09, 2006 12:36 PM
> > To: Bound, Jim; devel at lists.planet-lab.org
> > Subject: RE: [Planetlab-devel] IPv6 support for MyPLC
> >
> > Hi Jim,
> >
> > Today all PlanetLab nodes are configured by the hosting site.
> > Currently there is just one global IPv4 address per host. The
> > technical contact at the hosting site assigns a static IPv4
> > address (either manually or via DHCP).
> > It is not clear we can assume that sites will bring up DHCPv6
> > servers on our behalf (especially since we strongly request
> > to be in a DMZ outside of their firewall).  Maybe they will,
> > but a big concern is the convergence timeframe
> > + the sheer amount of email we might have to send/receive when asking
> > + sites
> > to turn on IPv6 support on our behalf.  For this reason, I'd
> > like to arrive at a solution that factors out most (ideally
> > all) human interaction with sites.  The basic assumption is
> > that a site supports IPv6 on their router and advertise
> > global IPv6 prefixes to the nodes.
> >
> > The challenge is to also assign global IPv6 addresses to each
> > "virtual machine" (sliver) on each node.  Where do those
> > addresses come from, considering we wont have DHCPv6? Hence
> > the discussion of trying to come up with an autoconf scheme
> > that assigns a EUI per sliver.
> >
> > > I believe stateless autoconfig will work ...
> >
> > Which one?
> >
> > > ... the problem is that
> > > any IP architecture view assumes some entity absorbs the IP address
> > > ...
> >
> > I don't understand the problem you are stating.  Please rephrase this.
> >
> > > I had indirectly suggested a software VLAN switch to
> > multiple vservers
> > > on a single node for IPv6 with use of prefix bits and same EUI.
> >
> > I think I understood this suggestion, but maybe I did not.
> > Please give an explicit example.  Also, what would we need to
> > ask each site to make such a solution work?  Do they have to
> > give us a set of prefixes?  Is it reasonable to ask for
> > dozens or hundreds of those prefixes per node?  How would one
> > coordinate the prefix assignment amongst hosts at a site?
> >
> > > IPv6 has done its job the tools exist.
> >
> > No doubt!  I am just trying to figure how to make it work in
> > the real world when faced with ~100 "virtual machiens" per
> > phyiscal host and the lack of a
> > DHCPv6 server.
> >
> > Thank you for your feedback!
> >
> > Best regards,
> > Marc
> >
> >
>
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