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Re: [v6tc] Re: Tunneling and Transition Drafts

Jeroen Massar <jeroen@unfix.org> Fri, 08 April 2005 16:14 UTC

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Subject: Re: [v6tc] Re: Tunneling and Transition Drafts
From: Jeroen Massar <jeroen@unfix.org>
To: "W. Mark Townsley" <townsley@cisco.com>
In-Reply-To: <42568FF5.8020401@cisco.com>
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Date: Fri, 08 Apr 2005 18:11:22 +0200
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On Fri, 2005-04-08 at 10:06 -0400, W. Mark Townsley wrote:
> Jeroen Massar wrote:
> 
> > On Fri, 2005-04-08 at 14:32 +0200, JORDI PALET MARTINEZ wrote: 
> > 
> >>I got the same answer. But company roadmaps could change, I'm not sure about
> >>the actual roadmap on this.
> > 
> > 
> > Longhorn will be out in 2007? 2008? Even then, it would require people
> > to install patches, and hearing that many have not even bothered to
> > install SP2 I don't see many people installing such an upgrade either.
> > I do hope it changes, but still L2TP will not cross most NAT's.
> 
> Jumping in with my old l2tpext hat on just to correct this inaccuracy: L2TP 
> operates over UDP 1701. Port 115 is for RFC3931 L2TPv3 "IP" mode that was

Thanks for the correction & clarification. I'll take that you meant
"Proto 115" instead of the port. When used in this mode then it will,
just like the others cross a NAT with ease, unless firewalled of course.
Because of the Keepalive protocol it will also stay 'up'. When the
source address changes (dhcp change, change of wireless net) one will
also automatically reconnect, might have a small delay but should work.

We still miss an actual implementation on the more widely deployed
platforms and as those are in the big target area this will be something
many people will want. I am actually tempted all of a sudden to just
implement it, but unfortunately not enough time for that.

Greets,
 Jeroen


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