cd /usr/local/src
wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm

wget http://rpms.famillecollet.com/enterprise/remi-release-6.rpm
rpm -Uvh remi-release-6*.rpm epel-release-6*.rpm

yum install -y vpnc

make sure the ports needed are opened up otherwise this will fail.
i.e. 1723,1701,47,443,(TCP) 1701,500, 5500,4500(UDP)  if on aws you'll need to open it on server AND firewall