Re: [mpls-linux-general] IPV6 over MPLS

[Vino T. <jv...@te...>]

Hello James,

On Fri, 5 Oct 2001, James R. Leu wrote:
> > On Tue, 2 Oct 2001, James R. Leu wrote:
> > > > My requirement is to connect to isolated IPV6 network over an existing
> > > > IPV4/MPLS network. 
> > > > IPV6 Cloud ---- Linux --- MPLS/IPV4 cloud ----- Linux ---- IPV6 Cloud
> > > > What is the best way out? What type of translation is suitable for this
> > > > scenario (6to4/6over4/6in4 etc)?
> > > ow did you plan to create the LSP across the ipv4 cloud?  Do you need to run
> > > routing across this link?
> > 
> > The two V6 sites can be having their own Site local addresses. So a static
> > route via the Edge Linux box would be good enough.
> > 
> > > For this application I think an MPLS tunnel interface is would do what you need.
> > 
> > Is this kind of support already available in the MPLS code? If so does it
> > require a V6 to V4 translatore as well on the Edge Linux box? If so what
> > translator is best suited for this task.
> 
> Their are two things that are not in place for the egress LER.  Here the
> packets need to come into the MPLS stack and go out via the IPv6 stack.  So
> the layer 3 protocol associated with the incoming label needs to be
> IPv6.  Currently mplsadm doesn't provide a means to say which layer 3
> protocol should be associated with a incoming label (I've assumed IPv4 uptil
> now).  In addition I have not tested the code that rebuild the IPv6 header
> and sends into IPv6 land.  Both are minor fixes and given some time, I
> could complete them in a night.  THe problem is I have no idea how to test
> it :-)
> 
> There are two options: you could send me info as to how to setup ipv6
> and I could try to reproduce your senerio, or I could provide you versions
> to test for me.  Which could you prefer?
> 
> Actually there is a 3rd option which is I tell you where in the code the
> work needs to be done and you fix/test it yourself :-)

Option 2 and Option 3 are ok with me. The 3rd Option looks more juicy
though :-)
I got a setup similar to what I had mentioned in my earlier mail. 

IPV6 Network ---- Linux ----IPV4/MPLS Cloud ---- Linux -----IPV6 Network

The IPV6 Network constitutes of Linux boxes running IPV6 stack.

Regards,
Vino.

> > > > On Sun, 30 Sep 2001, James R. Leu wrote:
> > > > 
> > > > > On Sat, Sep 29, 2001 at 07:14:42PM +0000, Vino Thomas wrote:
> > > > > > Hello,
> > > > > > 
> > > > > > Does Linux has support for IPV6 over MPLS?
> > > > > 
> > > > > Glad you asked (sorry for the delay in responding to you) :-)
> > > > > 
> > > > > #1 If you are trying to LSR activity (only labl swap) the yes :-)
> > > > > #2 If you want to use MPLS tunnel interface, then yes.
> > > > > #3 If you do not want to use MPLS tunnel interfaces and want to have specific
> > > > >   entries in the IPv6 routing table sent traffic on a particular LSP then no,
> > > > >   but it would be too hard to add.
> > > > > 
> > > > > #1 is obvious, label swapping is layer 3 agnostic
> > > > > #2 is a little obscure, and I haven't tested it, but it should work.
> > > > >    -create a MPLS tunnel interface
> > > > >    -ifconfig it up (without an address)
> > > > >    -add a ipv6 route that has a nexthop of the mpls tunnel
> > > > >     (just an outgoing interface no next hop ip)
> > > > > #3 requires that some how ipv6 route entries are marked with which LSP
> > > > >    they should sent traffic on.  Everywhere a ipv6 route lookup is done
> > > > >    then needs to  check for this MPLS data.
> > > > > 
> > > > > #2 should get you up and sending ipv6 data on LSPs
> > > > > #3 will take more work, but needs to be done at some point
> > > > > 
> > > > > I hope this gets the gears moving.  We can go into more details as you
> > > > > ask more questions.
> > > > > 
> > > > > Jim
> > > > > 
> > > > > 
> > > > > > 
> > > > > > Regards,
> > > > > > Vino
> > > > > > 
> > > > > > 
> > > > > > 
> > > > > > 
> > > > > > 
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> > > > > 
> > > > > -- 
> > > > > James R. Leu
> > > > > 
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> > > > > 
> > > > 
> > > > 
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> > > -- 
> > > James R. Leu
> > > 
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> > 
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> -- 
> James R. Leu
> 
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