[e2e] TCP Local Area Normal behaviour? any references?

[Joe Touch]

Jon Crowcroft wrote:
> right - once people got over the argument 
> "TCP is aheavyweight protocol"
> everyone used it to find the limit on 
> Their Favourite LAN - 
> 
> even wide area, most the landspeed record stuff
> (e.g. ipv6 6Gbps coast2coast) is TCP based
> 
> but what I am after is description of the normal dynamics of TCP on normal 
> configs rangin from shared to switched
> 10 to 100 ether environments - 
> how does the window and tx/rx packet rate vary over time  
> over a set of flows in a
> typical site ? 

I did some tests on the ATOMIC LAN at ISI in the early 1990s. One part 
often ignored in simulations is that some TCPs basically ignore 
congestion control on a LAN - if the dest addr is inside the same subnet 
as the interface being sent, the software "assumes" they're on a LAN and 
that the best thing to do is fight it out at the MAC layer (not always a 
good assumption, we helped show).

Have you looked to see if the congestion control windows are even being 
used, on the whole?

Joe

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