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Cisco ASA Series CLI Configuration Guide
Chapter 1 Getting Started with Application Layer Protocol Inspection
Information about Application Layer Protocol Inspection
Figure 1-1
How Inspection Engines Work
In
, operations are numbered in the order they occur, and are described as follows:
1.
A TCP SYN packet arrives at the ASA to establish a new connection.
2.
The ASA checks the access list database to determine if the connection is permitted.
3.
The ASA creates a new entry in the connection database (XLATE and CONN tables).
4.
The ASA checks the Inspections database to determine if the connection requires application-level
inspection.
5.
After the application inspection engine completes any required operations for the packet, the ASA
forwards the packet to the destination system.
6.
The destination system responds to the initial request.
7.
The ASA receives the reply packet, looks up the connection in the connection database, and
forwards the packet because it belongs to an established session.
The default configuration of the ASA includes a set of application inspection entries that associate
supported protocols with specific TCP or UDP port numbers and that identify any special handling
required.
When to Use Application Protocol Inspection
When a user establishes a connection, the ASA checks the packet against access lists, creates an address
translation, and creates an entry for the session in the fast path, so that further packets can bypass
time-consuming checks. However, the fast path relies on predictable port numbers and does not perform
address translations inside a packet.
Many protocols open secondary TCP or UDP ports. The initial session on a well-known port is used to
negotiate dynamically assigned port numbers.
Other applications embed an IP address in the packet that needs to match the source address that is
normally translated when it goes through the ASA.
If you use applications like these, then you need to enable application inspection.
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CONN
Inspection
Server
ASA
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: ......