04-13-2002
You need an entry in the /etc/netmasks file that looks something like this:
192.168.0.0 255.255.255.0
where 192.168.0.0 is the network (not the IP), and 255.255.255.0 is the netmask. You can also read the manpage on netmasks.
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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)