Guidelines for Objects
IPv6 Guidelines
Supports IPv6 with the following restrictions:
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You can mix IPv4 and IPv6 entries in a network object group, but you cannot use a mixed object group for NAT.
Additional Guidelines and Limitations
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Objects must have unique names, because objects and object groups share the same name space. While you might want to create a network object group named “Engineering” and a service object group named “Engineering,” you need to add an identifier (or “tag”) to the end of at least one object group name to make it unique. For example, you can use the names “Engineering_admins” and “Engineering_hosts” to make the object group names unique and to aid in identification.
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Object names are limited to 64 characters, including letters, numbers, and these characters: .!@#$%^&()-_{}. Object names are case-sensitive.
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You cannot remove an object or make an object empty if it is used in a command, unless you enable forward referencing (the forward-reference enable command).