udptunnel(1) on Linux
The text 1bd6dac75ddb, as Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze) shipped it.
Tunnel UDP packets over a TCP connection
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