08-22-2009
Use google. We have given you the answer, but since we do not know how the entirety of your network is configured, you need to do this part.
The basics are
You/your subnet > gateway < remote system
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LEARN ABOUT CENTOS
ipsec_subnetof
IPSEC_SUBNETOF(3) Library Functions Manual IPSEC_SUBNETOF(3)
NAME
ipsec_subnetof, ipsec_hostof, ipsec_broadcastof - given Internet address and subnet mask return subnet number, host part, broadcast address
SYNOPSIS
#include <libreswan.h>
struct in_addr subnetof(struct in_addr addr,
struct in_addr mask);
struct in_addr hostof(struct in_addr addr,
struct in_addr mask);
struct in_addr broadcastof(struct in_addr addr,
struct in_addr mask);
DESCRIPTION
These functions are obsolete; see ipsec_networkof(3) for their replacements.
Subnetof takes an Internet address and a subnet mask and returns the network part of the address (all in network byte order). Hostof simi-
larly returns the host part, and broadcastof returns the broadcast address (all-1s convention) for the network.
These functions are provided to hide the Internet bit-munging inside an API, in hopes of easing the eventual transition to IPv6.
SEE ALSO
inet(3), ipsec_atosubnet(3)
HISTORY
Written for the FreeS/WAN project by Henry Spencer.
BUGS
Calling functions for this is more costly than doing it yourself.
11 June 2001 IPSEC_SUBNETOF(3)