What Luigi says is absolutely correct. It doesn't take a lot to get this done. I've talked to a number of companies about implementing SACK for them and while there was interest, no one wanted to fund it all themselves, potentially for the benefit of their competitors.
Out of curiosity, can someone provide some pointers as to where SACK really helps? Is this just for high-speed WANs and doesn't help on LANs, or is it useful in both contexts? Also, at what speeds/packet sizes does SACK start to become really useful?
I'm just wondering if there aren't a lot of people who could benefit from something like this, only they don't know it. If they were to find out, it might help provide funding and other resources to spur development.
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