"Be conservative in what you send and liberal in what you accept" I would cite Postels Law: Nagle's is the "conservative send" side. An ACK is a signal of acce

"Be conservative in what you send and liberal in what you accept" I would cite Postels Law: Nagle's is the "conservative send" side. An ACK is a signal of acceptance, and should be issued more liberally (even though it's also sent, I guess).