The one point I would like to make, though, is that firewalls are NOT
"brain-damaged" for blocking ECN: according to the RFCs governing
firewalls, and the logic behind their design, blocking packets in an
unknown format (i.e. with reserved bits set) is perfectly legitimate. Yes,
those firewalls should be updated to allow ECN-enabled packets
through. However, to break connectivity to such sites deliberately just
because they are not supporting an *experimental* extension to the current
protocols is rather silly.
James.
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