I wanted to find out if remote X creates a lot of network flows, so I logged into a remote computer with "ssh -Y", started xclock, and then typed tcpdump. Then screen began scrolling up crazily like this:
13:21:00.694367 IP > . ack 60640 win 2003 <nop,nop,timestamp 191668683 75287130>
13:21:00.694430 IP > P 70416:70464(48) ack 113 win 501 <nop,nop,timestamp 191668683 75287200>
Was X sending/receiving lots of data even if it seems to be idling? It shouldn't be so silly.. And... Finally I realized what a big mistake I had made... It was like putting a microphone against a loudspeaker...

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