Full Discussion: Subnetting
Special Forums IP Networking Subnetting Post 34560 by Perderabo on Thursday 27th of February 2003 03:58:00 PM
If I understand correctly, you are trying to split your class B into two subnets, but with one subnet being 75% of the addresses and the other subnet being 25% of the adresses. You can't do that. The subnets must be equal in size. And all subnets must use the same netmask.
 
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IPSEC_SAMEADDR(3)					     Library Functions Manual						 IPSEC_SAMEADDR(3)

NAME
ipsec_sameaddr, ipsec_addrcmp, ipsec_samesubnet, ipsec_addrinsubnet, ipsec_subnetinsubnet, ipsec_subnetishost, ipsec_samesaid, ipsec_sameaddrtype, ipsec_samesubnettype - do comparisons for addresses, subnets, SA IDs and address families SYNOPSIS
#include <freeswan.h> int sameaddr(const ip_address *a, const ip_address *b); int addrcmp(const ip_address *a, const ip_address *b); int samesubnet(const ip_subnet *a, const ip_subnet *b); int addrinsubnet(const ip_address *a, const ip_subnet *s); int subnetinsubnet(const ip_subnet *a, const ip_subnet *b); int subnetishost(const ip_subnet *s); int samesaid(const ip_said *a, const ip_said *b); int sameaddrtype(const ip_address *a, const ip_address *b); int samesubnettype(const ip_subnet *a, const ip_subnet *b); DESCRIPTION
These functions do various comparisons and tests on the ip_address type and ip_subnet types. Sameaddr returns non-zero if addresses a and b are identical, and 0 otherwise. Addresses of different families are never identical. Addrcmp returns -1, 0, or 1 respectively if address a is less than, equal to, or greater than b. If they are not of the same address fam- ily, they are never equal; the ordering reported in this case is arbitrary (and probably not useful) but consistent. Samesubnet returns non-zero if subnets a and b are identical, and 0 otherwise. Subnets of different address families are never identical. Addrinsubnet returns non-zero if address a is within subnet s and 0 otherwise. An address is never within a subnet of a different address family. Subnetinsubnet returns non-zero if subnet a is a subset of subnet b and 0 otherwise. A subnet is deemed to be a subset of itself. A sub- net is never a subset of another subnet if their address families differ. Subnetishost returns non-zero if subnet s is in fact only a single host, and 0 otherwise. Samesaid returns non-zero if SA IDs a and b are identical, and 0 otherwise. Sameaddrtype returns non-zero if addresses a and b are of the same address family, and 0 otherwise. Samesubnettype returns non-zero if subnets a and b are of the same address family, and 0 otherwise. SEE ALSO
inet(3), ipsec_initaddr(3) HISTORY
Written for the FreeS/WAN project by Henry Spencer. 28 Nov 2000 IPSEC_SAMEADDR(3)

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