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Use

sudo vpnc

which is the command to use if you want to star the VPN client from the command line. You will probably want to use a configuration file /etc/vpnc/default.conf similar to the following unless you want to type each time all the requested options:

IPSec gateway my.vpn.gateway
IPSec ID my.ipsec.id
IPSec secret mysecret
# your username goes here:
Xauth username
# if you want to test rekeying specify nonzero seconds here:
Rekeying interval 0

The above file is just an example, you may have/need additional options depending on the remote VPN server configuration.

Use

sudo vpnc

which is the command to use if you want to star the VPN client from the command line. You will probably want to use a configuration file /etc/vpnc/default.conf similar to the following unless you want to type each time all the requested options:

IPSec gateway my.vpn.gateway
IPSec ID my.ipsec.id
IPSec secret mysecret
# your username goes here:
Xauth username
# if you want to test rekeying specify nonzero seconds here:
Rekeying interval 0

The above file is just an example, you may have/need additional options depending on the remote VPN server configuration.

IPSec gateway         The VPN server
IPSec ID              The group name of the VPN server
IPSec secret          The group secret of the VPN server
Xauth username        The user name of the user to login
Xauth password        Here the user's password can be inserted.
                      Because it will be saved in clear text in an
                      ASCII file, this should be avoided because of
                      security reasons

Use

sudo vpnc
/usr/sbin/vpnc

which is the command to use if you want to star the VPN client from the command line. You will probably want to use a configuration file /etc/vpnc/default.conf similar to the following unless you want to type each time all the requested options:

IPSec gateway my.vpn.gateway
IPSec ID my.ipsec.id
IPSec secret mysecret

The above file is just an example, you may have/need additional options depending on the remote VPN server configuration.

Note about additional options:

IPSec gateway         The VPN server
IPSec ID              The group name of the VPN server
IPSec secret          The group secret of the VPN server
Xauth username        The user name of the user to login
Xauth password        Here the user's password can be inserted.
                      Because it will be saved in clear text in an
                      ASCII file, this should be avoided because of
                      security reasons

sudo /usr/sbin/vpnc-disconnect