[AVT] Re: TCRTP, L2TPHC and L2TPoAAL5

[Tmima Koren <tmima@cisco.com>]

At 12:07 PM 2/3/2003 +0200, Daniel Feldman wrote:
>    
> Hello Tmima, Mr. Valencia, Mr. Wing and Mr. Thompson,
>     Section 3.3.2 of the current
> TCRTP draft has a bandwidth comparison table, including TCRTP over PPP
> and TCRTP over AAL5.
>     From the text I understand
> that:
> a) TCRTP over PPP includes Header Compression
> only once, so the IP header (20 bytes) is not compressed. This could be
> reduced by using the COMPRESSED_NON_TCP format described in RFC2507 below
> the L2TPHC tunnel.

The L2TP packet traverses multiple links between source and
destination
If some individual links on the path are point to point, it is possible
to compress the L2TP IP header using IPHC
But it's not like you can do IPHC at the source and have the packet go
compressed all the way to the destination
Once the packet is an L2TP packet it is a regular IP packet and it can be
compressed on individual links like any other IP packet
So I'm not sure we need to add this to the TCRTP draft
Regards
Tmima

> b) TCRTP over AAL5
> includes a 20-bytes IP header which could be reduced to zero, if L2TPHC
> worked straight over AAL5.
>  
>     My questions
> are:
> 1) Can we add the scenario described in (a) to
> the TCRTP draft?
> 2) Is it possible to extend L2TPHC so it is
> compatible with L2TPoAAL5 (RFC3355)?
> 3) Can we add this scenario to the TCRTP
> draft?
>  
>     Thanks in advance and
> regards,
>  
>        
> Daniel Feldman.
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Daniel Feldman
> System Architecture Group Manager, IC4IC Ltd.
> office: +972 (4) 959-4644 ext. 121
> mobile: +972 (55) 99-0299
> fax:    +972 (4) 959-4944
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>