[Planetlab-devel] IPv6 support for MyPLC

[Bound, Jim]

Hi Mark,

Yes it does.  Thus in the router advertisement on the link annouce say 4
prefixes.  Then the vserver take each prefix and assign the EUI to the
low order 64bits and the node as then say 4 IPv6 addresses.  This should
all work according to spec on Linux.  

The next part is the tricky part.  How do we assign a different address
to each sliver that is a PLL implementation issue as opposed to ipv6
spec issue.  Glad to help suggest ideas but I don't get or know the
options for the PLL vserver implementation to do this.

Thanks
/jim 

> -----Original Message-----
> From: Marc E. Fiuczynski [mailto:mef at CS.Princeton.EDU] 
> Sent: Thursday, November 09, 2006 1:06 PM
> To: Bound, Jim; devel at lists.planet-lab.org
> Subject: RE: [Planetlab-devel] IPv6 support for MyPLC
> 
> 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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