IPv4 to IPv6...

[Lennart Sorensen]

On Wed, Oct 06, 2010 at 08:16:07AM -0400, James Knott wrote:
> Hmmm...
>
> "First of all, the service is provided over native PPP, there is no  
> tunneling involved or 6to4 like most other providers."
>
> That doesn't make sense.  PPP is a method of carrying almost any type of  
> packet over some serial medium.  In ADSL a form of it called PPPoE is  
> used to carry IP via PPP over an ethernet connection.  So, unless  
> they're running some serial protocol directly over the wires, they are  
> in fact using tunnelling, which is no different than OpenVPN (ignoring  
> encryption) in UDP packets or IPv6 6in4 tunnelling with IP protocol 41.   
> In 6in4 tunnelling, the only difference from an IPv6 packet is the 20  
> byte IPv4 tacked on the front of it.
>
> When used to transport IPv6, PPP is tunnelling.

There is a difference between running IPv6 over IPv4 over PPP versus
IPv6 over PPP.

It does save 20 bytes per packet after all, which is not irrelevant.

If you consider tunnel to mean tunner over IP, then they are right.
Most people don't consider ppp to be a tunnel since it is point to
point over a wire.  Tunnels tend to be between end points that are not
directly connected.  Hence the idea of tunneling through a network.
PPP doesn't do that.

-- 
Len Sorensen
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