09-13-2001
you have to make it that way that all the computers are within range of the subnet mask of the server and the server wihin range of theres. or if you have a unix machien at a second ip to the network card. then you cdan see it (focourse within range of the computers who can't see it.
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LEARN ABOUT CENTOS
ipsec_bitstomask
IPSEC_GOODMASK(3) Library Functions Manual IPSEC_GOODMASK(3)
NAME
ipsec_goodmask, ipsec_masktobits, ipsec_bitstomask - check if Internet subnet mask is valid, convert Internet subnet mask to bit count,
convert bit count to Internet subnet mask
SYNOPSIS
#include <libreswan.h>
int goodmask(struct in_addr mask);
int masktobits(struct in_addr mask);
struct in_addr bitstomask(int n);
DESCRIPTION
These functions are obsolete; see ipsec_masktocount(3) for a partial replacement.
Goodmask reports whether the subnet mask is a valid one, i.e. consists of a (possibly empty) sequence of 1s followed by a (possibly empty)
sequence of 0s. Masktobits takes a (valid) subnet mask and returns the number of 1 bits in it. Bitstomask reverses this, returning the
subnet mask corresponding to bit count n.
All masks are in network byte order.
SEE ALSO
inet(3), ipsec_atosubnet(3)
DIAGNOSTICS
Masktobits returns -1 for an invalid mask. Bitstomask returns an all-zeros mask for a negative or out-of-range n.
HISTORY
Written for the FreeS/WAN project by Henry Spencer.
BUGS
The error-reporting convention of bitstomask is less than ideal; zero is sometimes a legitimate mask.
11 June 2001 IPSEC_GOODMASK(3)