Re: [rohc] Constant IP-ID in the RTP Profile(0x0001)

[Biplab Sarkar <[e-mail]>]

Hi Gangadharan,

IP-ID can be over-written with the value of RTP-SN at the compressor
before compression for all "un-fragmented" IPv4 packets. This will
enhance the compression.  Since IP-ID is used in IP fragmentation, we
can basically ignore its real value for "un-fragmented" IP packets.

Thanks & Regards,
Biplab Sarkar

On Thu, 2008-01-03 at 17:07 +0530, Gangadharan G, TLS-Chennai wrote:
> Hi All, 
> 
>  
> 
> In the Linux Suse 10.1 machine, the value of the IP-ID in the IPv4
> header is always zero (i.e., constant) in the entire IP datagrams.
> 
> The IP-ID Encoding, as per RFC 3095, of the RTP profile doesn’t handle
> this case (constant IP-ID).
> 
>  
> 
> Also this issue had been discussed in the mailing list.
> 
> http://www1.ietf.org/mail-archive/web/rohc/current/msg01502.html
> 
>  
> 
> When I searched in the Internet, I found few proposed solutions (yet
> to read them). 
> 
>             (draft-ietf-rohc-rfc3095bis-improvements-03.txt,
> draft-kapoor-rohc-rtp-new-requirements-00.txt, 
> 
>  RFC 3643 -- A Compression Profile for IP)
> 
>  
> 
> Please let me know the solution/standard that everyone is following
> for this issue in the RTP Profile.
> 
>  
> 
> Thanks,
> 
> Gangadharan
> 
> 
> 
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