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Note

For IPv6 network discovery, the use of discovery range definitions for all networks is required to ensure that you discover all the required hosts and network infrastructure. Also, consider using RFC 4193 local IPv6 network addresses (also called unique local IPv6 unicast). These values are globally routable within the enterprise but are independent of the ISP and allow for filtering at network boundaries. They are not globally routable prefixes. Their local IPv6 unicode address begins with FC00:/7. Examples of this type are used in this section. Globally routable prefixes begin with the 2000:/ or 2001:/ and are not used as examples in this document.

The Ranges tab defines the scope of the networks that NetMRI explores by defining CIDR address blocks, IP address ranges and IP address wildcards, and discovery blackout settings. The appliance limits its network exploration to the set of ranges defined in this tab.

  • CIDR: A CIDR address block is defined by a network address and bit mask (for example 192.168.1.0/24).
    An IPv6 example: FC00:56:aa12:ea23:a5:ac10:100/119. Any IPv6 CIDR values must include the IP address ranges that you want to discover.
  • IP Range: An IP address range defines a starting and ending IP address. For instance, in IPv4 you could define 192.168.1.0 as the start of the IP range and 192.168.1.255 as the end of the IP range. You cannot configure IP address range values for IPv6 networks.
  • IP Pattern: An IP address wildcard pattern defines IP address range using a wildcard character or range for a specific set of octets. A single wildcard can be an octet range specified by a dash (e.g., 10-254) or an asterisk (*) when the whole range for an octet is specified (0-255 for IPv4 and 0000-ffff for IPv6). For example, you can define either 192.*.1.* or 192.168.1-255.5 as the IP address wildcard pattern. An IP wildcard pattern will be rejected if it contains more than 65536 CIDRs. It is recommended to keep the total number of CIDRs under 1000, specifying more may affect performance.

The ranges table displays each defined range, its type (CIDR, IP Range, or IP Pattern), and its use in the discovery process. Ranges excluded for discovery indicate that any network device found matching that range is excluded from discovery by the appliance. For more information, see Range Examples.

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