Another term for subnet mask8/15/2023 Various other trademarks are held by their respective owners. WatchGuard and the WatchGuard logo are registered trademarks or trademarks of WatchGuard Technologies in the United States and other countries. Because you cannot configure a virtual external interface with a default gateway on a different subnet, you cannot use a /32 subnet mask for a virtual external interface, such as a VLAN or Link Aggregation interface. In mixed routing mode, you can only configure a 32-bit subnet mask for a physical external interface. 32-bit Subnet Mask (/32)Ī 32-bit subnet mask defines a network with only one IP address. The use of 31-bit subnet masks for IPv4 point-to-point links is described in RFC 3021. But no response will be send back to 10.0.4.1 because 10.0.3.1 need a gateway to reach this host being on another subnet. The other host will get it (you can check it by running network sniffer like Wireshark on 10.0.3.1). A 31-bit subnet mask is often used for an interface that is the endpoint of a point-to-point network. In your example, 10.0.4.1 can send packet to the other host even if it has no gateway since the other host is on its subnet. In mixed routing mode, you can configure any external interface to use an IPv4 address with a 31-bit subnet mask. For information about slash notation, see About Slash Notation. When you configure an IP address, you specify the subnet mask in slash notation. 31-bit and 32-bit subnet masks are supported in Fireware v12.1 and higher for secondary external interfaces. If your Firebox is configured in mixed routing mode, you can configure an external interface to use an IPv4 address with a 31-bit or 32-bit subnet mask.ģ1-bit and 32-bit subnet masks are supported in Fireware XTM v11.9.4 and higher for primary external interfaces. To conserve IPv4 addresses, some Internet Service Providers assign IPv4 addresses with a /31 or /32 subnet mask.
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