Use openconnect as an alternative to Cisco AnyConnect VPN client.

.zshrc

export VPN_USER=$YOUR_VPN_USER
export VPN_HOST=$YOUR_VPN_HOST

openconnect_setup.zsh

brew install openconnect
brew search tuntap
brew install tuntap
sudo cp -pR /usr/local/Cellar/tuntap/20111101/Library/Extensions/tap.kext /Library/Extensions/
sudo cp -pR /usr/local/Cellar/tuntap/20111101/Library/Extensions/tun.kext /Library/Extensions/
sudo chown -R root:wheel /Library/Extensions/tap.kext
sudo chown -R root:wheel /Library/Extensions/tun.kext
sudo touch /Library/Extensions/
sudo cp -pR /usr/local/Cellar/tuntap/20111101/tap /Library/StartupItems/
sudo chown -R root:wheel /Library/StartupItems/tap
sudo cp -pR /usr/local/Cellar/tuntap/20111101/tun /Library/StartupItems/
sudo chown -R root:wheel /Library/StartupItems/tun
sudo mkdir /var/run/vpnc

cd /usr/local/bin
ln -s /usr/local/opt/tuntap/tap .
ln -s /usr/local/opt/tuntap/tun .

cd /Library/Extensions
sudo kextload -v tun.kext

touch ~/openconnect.pid

vpn_connect.zsh

sudo openconnect -u $VPN_USER -b -l --pid-file=$HOME/openconnect.pid $VPN_HOST

vpn_disconnect.zsh

sudo kill `cat ~/openconnect.pid`

vpn_connect.zsh will run the VPN connection in the background and log to the system log.