RE: : New ID : Diameter Compression

1. Diameter Compression vs TLS Compression: The former is End-To-End ie
only client compresses and server decompresses where as in TLS
compression, at each hop, compression / decompression will happen. Also
some private n/w does not use TLS & IKE for performance consideration.

2. The draft is proposed so that DIAMETER protocol may have the
capability to support end-to-end compression.

3. The Diameter Compression is per AVP and I think this is reasonably
well explained in the draft.


-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of Miguel Garcia
Sent: Friday, September 23, 2005 12:54 PM
To: Bernard Aboba
Cc: [email protected]
Subject: Re: [AAA-WG]: New ID : Diameter Compression

I also have similar thoughts at a first glance at the I-D.

I think that the draft focuses on how to negotiate some compression 
algorithm, but it does not describe:

a) What is actually compressed? Is it the whole Diameter message, or 
just one or more AVPs within a message.

b) A clear justification of the problem. In essence, Diameter will be 
typically used in real-time environments characterized also by the 
presence of high bandwidth (this is a network-to-network protocol, so it

is not going to reach low-bandwidth interfaces such as a mobile phone). 
So I wouldn't like that Diameter peers spend a very precious time 
compressing and decompressing a few kilobytes of data when there is a 1 
GB/s Ethernet connection among them. It will be faster and cheaper to 
send the data uncompressed.

My opinion is that there is no need for this draft. At least, I cannot 
see the applicability nor the requirements.

/Miguel


Bernard Aboba wrote:

> Diameter already supports compression at the ttransmission layer via
TLS and IKE. 
> 
> Does anyone understand why this "extension" is necessary?
> 
> On Thu, 22 Sep 2005, Rajith wrote:
> 
> 
>>All
>>
>>	A draft about "Diameter Compression" is available now.
>>
>>	Please review the same and give your comments.
>>
>>Warmest Regards
>>
>>Rajith
>>
>>______________________________________________________________________
______
>>______________________
>>
>>A New Internet-Draft is available from the on-line Internet-Drafts
>>directories.
>>
>>
>>		 Title		 		 : Diameter Compression
>>		 Author(s)		 : H. Zhangtao, R. Rajith
>>		 Filename		 :
draft-zhangtao-aaa-compression-00.txt
>>		 Pages		 		 : 11
>>		 Date		 		 : 2005-9-14
>>
>>  This document describes the negotiation of compression algorithm
>>  between two Diameter peers and the indication of data compression
>>  using a new AVP [Attribute Value Pair] flag.
>>
>>A URL for this Internet-Draft is:
>>http://www.ietf.org/internet-drafts/draft-zhangtao-aaa-compression-00.
txt
>>
>>
> 
> 

-- 
Miguel A. Garcia           tel:+358-50-4804586
sip:[email protected]
Nokia Research Center      Helsinki, Finland