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7-2
Cisco ASA Series Firewall ASDM Configuration Guide
Chapter 7 Configuring Access Rules
Information About Access Rules
General Information About Rules
This section describes information for both access rules and EtherType rules, and it includes the
following topics:
• Implicit Permits, page 7-2
• Information About Interface Access Rules and Global Access Rules, page 7-2
• Using Access Rules and EtherType Rules on the Same Interface, page 7-2
• Rule Order, page 7-3
• Implicit Deny, page 7-3
• Using Remarks, page 7-3
• NAT and Access Rules, page 7-3
• Inbound and Outbound Rules, page 7-3
• Transactional-Commit Model, page 7-4
Implicit Permits
For routed mode, the following types of traffic are allowed through by default:
• Unicast IPv4 traffic from a higher security interface to a lower security interface.
• Unicast IPv6 traffic from a higher security interface to a lower security interface.
For transparent mode, the following types of traffic are allowed through by default:
• Unicast IPv4 traffic from a higher security interface to a lower security interface.
• Unicast IPv6 traffic from a higher security interface to a lower security interface.
• ARPs in both directions.
Note ARP traffic can be controlled by ARP inspection, but cannot be controlled by an access rule.
• BPDUs in both directions.
For other traffic, you need to use either an access rule (IPv4 and IPv6) or an EtherType rule
(non-IPv4/IPv6).
Information About Interface Access Rules and Global Access Rules
You can apply an access rule to a specific interface, or you can apply an access rule globally to all
interfaces. You can configure global access rules in conjunction with interface access rules, in which
case, the specific interface access rules are always processed before the general global access rules.
Note Global access rules apply only to inbound traffic. See the “Inbound and Outbound Rules” section on
page 7-3.
Using Access Rules and EtherType Rules on the Same Interface
You can apply both access rules and EtherType rules to each direction of an interface.