http://www.openswan.org/

# yum install openswan



vi /etc/sysctl.conf

net.ipv4.ip_forward = 1
net.ipv4.conf.default.rp_filter = 0
	

yum install -y http://vesta.informatik.rwth-aachen.de/ftp/pub/Linux/fedora-epel/6/x86_64/epel-release-6-7.noarch.rpm