ipsec.conf

This a good VPN source

# /etc/ipsec.conf - FreeS/WAN IPsec configuration file

version 2.0


conn me-to-anyone
	left=%defaultroute
	right=%opportunistic
	# uncomment to enable incoming; change to auto=route for outgoing
	#auto=add

# VPN connection
conn west-east
	# Left security gateway, subnet behind it, next hop toward right.
	left=192.1.2.45
	leftid=@west
	leftrsasigkey=0sAQNzGEFs18VKT00sA+4p+GUKn9C55PYuPQca6C+9Qhj0jfMdQnTRTDLeI+lp9TnidHH7fVpq+PkfiF2LHlZtDwMurLlwzbNOghlEYKfQ080WlOTTUAmOLhAzH28MF70q3hzq0m5fCaVZWtxcV+LfHWdxceCkjBUSaTFtR2W12urFCBz+SB3+OM33aeIbfHxmck2yzhJ8xyMods5kF3ek/RZlFvgN8VqBdcFVrZwTh0mXDCGN12HNFixL6FzQ1jQKerKBbjb0m/IPqugvpVPWVIUajUpLMEmi1FAXc1mFZE9x1SFuSr0NzYIu2ZaHfvsAZY5oN+I+R2oC67fUCjgxY+t7
	leftsubnet=192.0.1.254/24
	leftnexthop=192.1.2.23
	# Right security gateway, subnet behind it, next hop toward left.
	right=192.1.2.23
	rightid=@east
	rightrsasigkey=0sAQN3cn11FrBVbZhWGwRnFDAf8O9FHBmBIyIvmvt0kfkI2UGDDq8k+vYgRkwBZDviLd1p3SkL30LzuV0rqG3vBriqaAUUGoCQ0UMgsuX+k01bROLsqGB1QNXYvYiPLsnoDhKd2Gx9MUMHEjwwEZeyskMT5k91jvoAZvdEkg+9h7urbJ+kRQ4e+IHkMUrreDGwGVptV/hYQVCD54RZep6xp5ymaKRCDgMpzWvlzO80fP7JDjSZf9LI/MMu6c+qwXIKnWoNha75IhFyLWniVczxK2RdhmMhLsi0kC0CoOwWDSIEOb+5zbECDjjud+SF5tT8qRCWnSomX8jtbCdZ50WraQlL
	rightsubnet=192.0.2.254/24
	rightnexthop=192.1.2.45
	auto=start