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Cisco ASA Series CLI Configuration Guide
Chapter 1 Information About Access Lists
Access Control Implicit Deny
Access Control Implicit Deny
All access lists have an implicit deny statement at the end, so unless you explicitly permit traffic to pass,
it will be denied. For example, if you want to allow all users to access a network through the ASA except
for one or more particular addresses, then you need to deny those particular addresses and then permit
all others.
For EtherType access lists, the implicit deny at the end of the access list does not affect IP traffic or
ARPs; for example, if you allow EtherType 8037, the implicit deny at the end of the access list does not
now block any IP traffic that you previously allowed with an extended access list (or implicitly allowed
from a high security interface to a low security interface). However, if you
explicitly
deny all traffic with
an EtherType ACE, then IP and ARP traffic is denied.
IP Addresses Used for Access Lists When You Use NAT
For the following features, you should always use the
real
IP address in the access list when you use
NAT, even if the address as seen on an interface is the mapped address:
•
access-group
command
•
Modular Policy Framework
match access-list
command
•
Botnet Traffic Filter
dynamic-filter enable classify-list
command
•
AAA
aaa ... match
commands
•
WCCP
wccp redirect-list group-list
command
The following features use access lists, but these access lists use the
mapped
values as seen on an
interface:
•
IPsec access lists
•
capture command access lists
•
Per-user access lists
•
Routing protocols
•
All other features...
Where to Go Next
For information about implementing access lists, see the following chapters in this guide:
•
Chapter 1, “Adding an Extended Access Control List”
•
Chapter 1, “Adding an EtherType Access List”
•
Chapter 1, “Adding a Standard Access Control List”
•
Chapter 1, “Adding a Webtype Access Control List”
•
Summary of Contents for 5505 - ASA Firewall Edition Bundle
Page 28: ...Glossary GL 24 Cisco ASA Series CLI Configuration Guide ...
Page 61: ...P A R T 1 Getting Started with the ASA ...
Page 62: ......
Page 219: ...P A R T 2 Configuring High Availability and Scalability ...
Page 220: ......
Page 403: ...P A R T 2 Configuring Interfaces ...
Page 404: ......
Page 499: ...P A R T 2 Configuring Basic Settings ...
Page 500: ......
Page 533: ...P A R T 2 Configuring Objects and Access Lists ...
Page 534: ......
Page 601: ...P A R T 2 Configuring IP Routing ...
Page 602: ......
Page 745: ...P A R T 2 Configuring Network Address Translation ...
Page 746: ......
Page 845: ...P A R T 2 Configuring AAA Servers and the Local Database ...
Page 846: ......
Page 981: ...P A R T 2 Configuring Access Control ...
Page 982: ......
Page 1061: ...P A R T 2 Configuring Service Policies Using the Modular Policy Framework ...
Page 1062: ......
Page 1093: ...P A R T 2 Configuring Application Inspection ...
Page 1094: ......
Page 1191: ...P A R T 2 Configuring Unified Communications ...
Page 1192: ......
Page 1333: ...P A R T 2 Configuring Connection Settings and QoS ...
Page 1334: ......
Page 1379: ...P A R T 2 Configuring Advanced Network Protection ...
Page 1380: ......
Page 1475: ...P A R T 2 Configuring Modules ...
Page 1476: ......
Page 1549: ...P A R T 2 Configuring VPN ...
Page 1550: ......
Page 1965: ...P A R T 2 Configuring Logging SNMP and Smart Call Home ...
Page 1966: ......
Page 2059: ...P A R T 2 System Administration ...
Page 2060: ......
Page 2098: ...1 8 Cisco ASA Series CLI Configuration Guide Chapter 1 Troubleshooting Viewing the Coredump ...
Page 2099: ...P A R T 2 Reference ...
Page 2100: ......