vtund(8) on Linux
The text 49e37feaebea, as Debian 12 (Bookworm), Debian 11 (Bullseye) shipped it. The page shows this text now.
VTun(Virtual Tunnel) daemon.
Flags it lists
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-4 -
-6 -
-P -
-f -
-i -
-m -
-n -
-p -
-q -
-s -
-t