vpnc(8) on Linux
The text c25154e5394c, as Debian 12 (Bookworm) shipped it.
client for Cisco VPN3000 Concentrator, IOS and PIX
Flags it lists
-
--enable-1des -
--enable-no-encryption -
--enable-weak-authentication -
--enable-weak-encryption -
--no-detach -
--non-inter -
--xauth-inter