[rohc] FW: GRE and RFC 3095.

[Remi Pelland <remi.pelland@octasic.com>]

Hi,

I haven't received any response to my question below.  Anyone know about the
two "GRE checksum" fields appearing in the general packet format shown at
the beginning of section 5.7?

Thanks.
Remi.

>  -----Original Message-----
> From: 	Remi Pelland  
> Sent:	Monday, March 03, 2003 10:01 AM
> To:	'rohc@ietf.org'
> Subject:	GRE and RFC 3095.
> 
> 
> The general compressed RTP header format provided in section 5.7 shows two
> occurences of "GRE checksum".  I understand that the one following the "AH
> data for outer list" is associated with the outer GRE header, which leaves
> the one just before the "UDP checksum" associated with the inner header.
> 
> I'm far from being a GRE expert, so there may be something I didn't quite
> understand.  However, when looking at RFC 2784 it seems to me like the GRE
> header is always followed by an IPv4 header (the one from the payload
> packet).  It thus seems impossible to find a GRE header somewhere between
> the inner IP header and the UDP header.
> 
> With this in mind, I'm wondering about the purpose of the second "GRE
> checksum" entry in the general packet format.
> 
> Any input on this would be appreciated.
> 
> Thanks,
> Rémi.
> 
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