Re: [Softwires] Other draft-ietf-softwire-hs-framework-l2tpv2-00 comments

On 7/10/06, Florent Parent <florent.parent@gmail.com> wrote:
>
>
> Some other comments on draft-ietf-softwire-hs-framework-l2tpv2-00
>
> 6.1.2.  Tunnel Maintenance
>
>     Periodically, SI must transit some message to the SC to maintain
>     context in the NAT and can be used to detected tunnel failure (but
>     PPP/LCP may be more reactive).  LNS and LAC can generate HELLO
>     messages.  As specified in [RFC2661] HELLO messages SHOULD be
>     generated if no other messages are sent for a period of time.  The
>     value of 60 seconds recommended by [RFC2661] fulfills Softwires
>     constraints.
>
> It is unclear whether LCP echo/reply should be used or not. Since
> L2TP HELLO exchange is used, should LCP echo/reply *not* be used?


that's a good question, PPP may be more reactive than L2TP, we have to check
if it is true

Laurent

6.2.1.  MTU
>
>     The MTU of the PPP link SHOULD be the link MTU minus the size of the
>     IP, UDP and L2TP headers together.  On a link with a MTU equal to
>     1500 bytes, this would usually mean a PPP MTU of 1472 bytes.  This
>     may vary according to the size of the L2TP header.
>
> 1500-1472=28. That accounts for the IPv4 and UDP headers only. You
> need to subtract the L2TP and PPP header length to represent the
> available MTU to IPv6.
>
> Florent
>
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