CIDR attributes in a client map

You can use Classless Inter-Domain Routing (CIDR) notation to specify subnetted IPv4 or IPv6 addresses. (A subnet is a range of logical addresses within the address space assigned to an organization.) Within the realm of FMS client map functionality, the subnet attribute is the base IP address. CIDR notation uses the following format: IPv4-or-IPv6-address / prefix-length The prefix length specifies how many leftmost bits of the address specify the prefix. This is an alternate way of using the subnet and mask attributes in a clientmap element in the fmsmaster_fscid.xml file. The prefix length masks a requesting FCC IP address and then compares the results with the prefix of the IP address to determine whether the requesting FCC address is assigned to a particular client map. The client map must contain a set of FSCs to be assigned to FSC clients. Note The maximum prefix length is 32 for IPv4 addresses and 128 for IPv6 addresses. The following example illustrates a default client map using the CIDR method with an IPv4 address: Copy The following example illustrates a client map using the CIDR method with an IPv6 address: Copy When using the CIDR method, you can create a default client map by setting the address and prefix length to zeroes. The following example illustrates a default client map using the CIDR method with an IPv4 address: Copy The following example illustrates a default client map using the CIDR method with an IPv6 address: Copy Warning This technique cannot be used in conjunction with DNS-based client map attributes. If you use a prefix length value of 0 in conjunction with DNS-based client map attributes, DNS client attributes are not considered.