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VPN IPSec Openswan

 
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Old 07-21-2014
If you need to redirect traffic from VPN tunnel to eth0 than you must use iptables ro rewrite destination address

Code:
iptables -A FORWARD -i eth0:1 -o eth0 -j ACCEPT
iptables -A FORWARD -i eth0:0 -o eth0 -j ACCEPT
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

after that you need to enable ipv_4 forwarding

Code:
sysctl -w net.ipv4.ip_forward=1

To stay permanent you need to edit /etc/sysctl.conf file

On the other side you must enable input traffic

Code:
iptables -A INPUT -s <eth0> -j ACCEPT

 
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LEARN ABOUT CENTOS

ipsec__stackmanager

_STACKMANAGER(8)						Executable programs						  _STACKMANAGER(8)

NAME

       ipsec__stackmanager - internal script to bring up kernel components for Libreswan

SYNOPSIS

       ipsec _stackmanager start

       ipsec _stackmanager stop

DESCRIPTION

       ipsec _stackmanager is called from within the init sub-system (systemd, upstart, sysv initscripts) to bring up the Libreswan kernel
       component as configured via the protostack= option in the ipsec.confi configuration file.

       This involves loading and optionally unloading of the required kernel modules. Because the Linux kernel cannot autodetect most crypto
       related drivers on-demand, _stackmanager handles loading the hardware random number (RNG) device drivers, OpenBSD/FreeBSD Cryptographic
       Framework (OCF) drivers, CryptoAPI drivers, and the modules for the specific stack (Linux NETKEY/XFM or KLIPS/MAST). Probing for OCF
       supported hardware is not supported - those modules must be loaded by the system before the start of the Libreswan sub system.

SEE ALSO

       ip(8), ipsec_tncfg(8), ipsec.conf(5), ipsec_addconn(8), pluto(8)

HISTORY

       This script was introduced in Libreswan. On the older Openswan systems, this functionality was split over various script files such as
       ipsec _startnetkey, ipsec _startklips, ipsec _realsetup and ipsec setup. Man page written for the Libreswan project
       <http://www.libreswan.org/> by Paul Wouters.

AUTHOR

       Paul Wouters
	   placeholder to suppress warning

libreswan							    12/16/2012							  _STACKMANAGER(8)