[e2e] end2end-interest Digest, s/Vol 53, Issue 10 / sacred cows, sacre bleu/

[Joe Touch]

Jon Crowcroft wrote:
> speaking of sacred cows,
> why are their source addresses in IP Packets?
> http://www.cl.cam.ac.uk/~jac22/out/sna.pdf

The same reason letters have return addresses; for errors (e.g., ICMPs). 
  Not all errors signal the transport layer; some signal the network 
layer (e.g., too-big, redirect, etc.)

PS - burying them in the TCP header eats option space from TCP, which 
isn't exactly in abundance either ;-)

Joe

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