RE: congestion control? - (was Re: Appointment of a Transport Area Director)

["Dearlove, Christopher (UK)" <[e-mail]>]

I've no idea about the example quoted, but I can see some of their motivation.

TCP's assumptions (really simplified) that loss of packet = congestion => backoff
aren't necessarily so in a wireless network, where packets can be lost without
congestion. This means that TCP into, out of, or across, a MANET using TCP can be
bad. It then tends to happen that the MANET people don't fully understand TCP,
and the TCP people don't fully understand MANETs.

I don't have a single good reference for what I say above, in particular have
things got better (or worse) as TCP evolves, and therefore which references
are still valid? But the obvious Google search (TCP MANET) throws up various
discussions.

-- 
Christopher Dearlove
Senior Principal Engineer, Communications Group
Communications, Networks and Image Analysis Capability
BAE Systems Advanced Technology Centre
West Hanningfield Road, Great Baddow, Chelmsford, CM2 8HN, UK
Tel: [phone] |  Fax: [phone]
[e-mail] | http://www.baesystems.com

BAE Systems (Operations) Limited
Registered Office: Warwick House, PO Box 87, Farnborough Aerospace Centre, Farnborough, Hants, GU14 6YU, UK
Registered in England & Wales No: 1996687

-----Original Message-----
From: [e-mail] [mailto:[e-mail]] On Behalf Of Martin Rex
Sent: 05 March 2013 00:42
To: [e-mail]
Cc: [e-mail]
Subject: Re: congestion control? - (was Re: Appointment of a Transport Area Director)

Bob Braden wrote:
> On 3/4/2013 10:20 AM, Roger Jørgensen wrote:
> > I'll ask a rather basic question and hope someone will answer in an 
> > educational way - Why is congestion control so important? And where 
> > does it apply? ... :-) 
> 
> Ouch. Because without it (as we learned the hard way in the late 1980s) \
> the Internet may collapse and provide essentially no service.
 
It is PR like this one:

  http://www.fujitsu.com/global/news/pr/archives/month/2013/20130129-02.html

That gets me worried about folks might try to "fix" the internet
mostly due to the fact that they really haven't understood what
is already there any why.

-Martin


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