[re-ECN] VIability issue #2

[Leslie Daigle <[e-mail]>]

[This attempts to outline an issue that could be perceived as 
challenging the viability of congestion exposure work.  The goal is to 
capture the issue, as well as itemize reasonable supporting arguments 
(for viability) and remaining questions to be addressed.  Please respond 
with suggestions as needed for each section.  ]

Viability Issue #2

The expectation is that congestion exposure information will be carried 
in IP packet headers.  Is there really enough room to do that 
effectively (in IPv4)?


For discussion:
This assumes tight timing -- that feedback is received and acted upon 
such that subsequent flows will experience the same or similar network 
state.  What are the implications (or likelihood) of different paths? 
Or, are there other network state changes that will (could) change in 
that timeframe (now or in future developments).

Leslie.

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"Reality:
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Leslie Daigle
[e-mail]
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