vpnc(8) on Linux
The text b9ccb4a68acc, as Debian 10 (Buster), Debian 9 (Stretch) shipped it.
client for Cisco VPN3000 Concentrator, IOS and PIX
Flags it lists
-
--enable-1des -
--enable-no-encryption -
--no-detach -
--non-inter -
--xauth-inter