root@ubuntu:~# aptitude install openconnect
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Reading extended state information      
Initializing package states... Done
The following NEW packages will be installed:
  openconnect 
0 packages upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 0B/72.1kB of archives. After unpacking 233kB will be used.
Writing extended state information... Done
Selecting previously deselected package openconnect.
(Reading database ... 190022 files and directories currently installed.)
Unpacking openconnect (from .../openconnect_2.22-1~ismith1_amd64.deb) ...
Setting up openconnect (2.22-1~ismith1) ...
Reading package lists... Done             
Building dependency tree       
Reading state information... Done
Reading extended state information      
Initializing package states... Done
Writing extended state information... Done

root@ubuntu:~# curl http://whatismyip.akamai.com; echo
71.192.160.95
root@ubuntu:~# openconnect -s /etc/vpnc/vpnc-script https://vpn.mit.edu
Attempting to connect to 18.9.37.5:443
SSL negotiation with vpn.mit.edu
Connected to HTTPS on vpn.mit.edu
GET https://vpn.mit.edu/
GET https://vpn.mit.edu/+webvpn+/index.html
Please enter your username and password.
USERNAME:broder
Password:
POST https://vpn.mit.edu/+webvpn+/index.html
Got CONNECT response: HTTP/1.1 200 OK
CSTP connected. DPD 30, Keepalive 20
Connected tun0 as 18.101.16.111, using SSL + deflate
Established DTLS connection
^Z
[1]+  Stopped                 openconnect -s /etc/vpnc/vpnc-script https://vpn.mit.edu
root@ubuntu:~# bg
[1]+ openconnect -s /etc/vpnc/vpnc-script https://vpn.mit.edu &
root@ubuntu:~# curl http://whatismyip.akamai.com; echo
18.101.16.111
root@ubuntu:~# kill %1
root@ubuntu:~# Send BYE packet: Client killed

[1]+  Exit 1                  openconnect -s /etc/vpnc/vpnc-script https://vpn.mit.edu
root@ubuntu:~#