Configure IPv4 Addressing for ASA Subinterface

Type: You can use either static IP addressing or DHCP for the interface.

Static - Choose this option if you want to assign an address that should not change.

• IP Address and Subnet Mask: ​Enter the interface's IP address and the subnet mask for the network attached to the interface.

• Standby IP Address: If you configured high availability and are monitoring this interface for HA, also configure a standby IP address on the same subnet. This interface on the standby device uses the standby address.

  For each interface, set a standby IP address. Although recommended, the standby address is not required. Without a standby IP address, the active unit cannot perform network tests to check the standby interface health; it can only track the link state.

DHCP: Choose this option if the address should be obtained from the DHCP server on the network.

You can check the Obtain Default Route check box to get the default route from the DHCP server. You would normally check this option.

Configure IPv6 Address for the subinterface if you intend to assign an IPv6 address to this interface.

Configure Advanced ASA subinterface. The advanced settings have defaults that are appropriate for most networks. Edit them only if you are resolving network issues.

If you saved the subinterface, and you don't want to continue advanced subinterface options, continue to Enable the subinterface.