Re: [L2tpext] Offset size

If you have an odd-sized layer two frame being carried between your tunnel
header and the framed network packets (e.g. an IP packet being framed by a PPP
packet with PFC negotiated, resulting in a 3 byte PPP frame) then it could help
the performance of some implementations to insert padding bytes to ensure
alignment of the framed network packet (e.g. the IP packet). 

At one time, it's affect on at least some implementations was measurable,
particularly on an LNS which routed the tunneled, framed, IP packet locally
rather than sending it out another physical connection. The implications today
may not be as marked, and is in fact becoming more and more contraversial as to
whether it is even necessary, but still could theoretically be an issue. It is
always, of course, optional.

- Mark

Cédric Fau wrote:
> 
> Hello,
> 
> I have some issues with the offset size field. I don't understand its aim.
> If it is still present in the L2TP header in the
> draft-ietf-l2tpext-l2tp-ppp-01.txt, that's
> because there is a use of this field. But what kind of use ?
> 
> Cédric Fau
> mailto: cedric.fau@etu.enseeiht.fr
> 
> Student in Telecommunication and Network Engineering
> http://www.enseeiht.fr/
> 
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