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Cisco ASA 5500 Series Configuration Guide using ASDM
Chapter 15 Completing Interface Configuration (Transparent Mode, 8.4 and Later)
Monitoring Interfaces
To automatically assign the link-local address (recommended), see the “(Optional) Configuring the
Link-Local Addresses Automatically” section on page 15-20.
For other IPv6 options, including enforcing the Modified EUI-64 format, and DAD settings, see the
“Configuring a Global IPv6 Address and Other Options” section on page 15-18.
To assign a link-local address to a physical interface or subinterface, including the management
interface, perform the following steps:
Step 1 Choose the Configuration > Device Setup > Interfaces pane.
Step 2 Select an interface, and click Edit.
The Edit Interface dialog box appears with the General tab selected.
Step 3 Click the IPv6 tab.
Step 4 To set the link-local address, enter an address in the Link-local address field.
A link-local address should start with FE8, FE9, FEA, or FEB, for example fe80::20d:88ff:feee:6a82.
See the “IPv6 Addresses” section on page A-5 for more information about IPv6 addressing.
Step 5 Click OK.
Allowing Same Security Level Communication
By default, interfaces on the same security level cannot communicate with each other, and packets
cannot enter and exit the same interface. This section describes how to enable inter-interface
communication when interfaces are on the same security level.
Information About Inter-Interface Communication
Allowing interfaces on the same security level to communicate with each other is useful if you want
traffic to flow freely between all same security interfaces without access lists.
If you enable same security interface communication, you can still configure interfaces at different
security levels as usual.
Detailed Steps
To enable interfaces on the same security level to communicate with each other, from the Configuration
> Interfaces pane, check Enable traffic between two or more interfaces which are configured with
same security level.
Monitoring Interfaces
This section includes the following topics:
• ARP Table, page 15-22
• DHCP, page 15-22
• MAC Address Table, page 15-25
• Dynamic ACLs, page 15-25