In the F5 BIG-IP system, virtual servers are categorized based on their destination address and mask. The system distinguishes between three primary destination scopes:
Host Virtual Server: A virtual server that has a specific IP address (e.g., 10.10.10.50) and a /32 mask.
Network Virtual Server: A virtual server that has a destination address representing a subnet (e.g., 192.168.10.0) and a specific mask (e.g., /24).
Wildcard Virtual Server: A virtual server that has a destination address of 0.0.0.0 (or :: for IPv6) and a mask of 0.0.0.0 (or /0).
While a " Forwarding (IP) " virtual server (Option D) is the Type (behavioral configuration) often used to route traffic without load balancing, the term Wildcard (Option C) is the specific administrative term used to define the " type " of virtual server based on the 0.0.0.0 destination address .
A common architectural use case is to create a Wildcard Virtual Server that listens only on an internal VLAN to act as a default gateway for outbound traffic (Internet access) for back-end servers. This ensures the BIG-IP system can process and forward traffic that does not match any other specific virtual server configuration.
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