Linux: Listen to the Network -- Literally

Pipe all the raw data received on the interface eth0 to aplay:

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tcpdump -i eth0 -w - | aplay

Listen to the network in stereo:

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tcpdump -i eth0 -w - | aplay -c 2

Use a filter expression to only listen to specific data:

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tcpdump -i eth0 -w -  tcp port 80 | aplay