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ASA TCP Connection Flags (Connection Build-Up and Teardown)
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Contents
Introduction
This document provides information about Adaptive Security Appliance (ASA) TCP connection flags.
Prerequisites
Requirements
Cisco recommends that you have knowledge of these topics:
Basic knowledge of the TCP Communications Protocol
Basic knowledge of the ASA CLI
Components Used
The information in this document is based on ASA version 8.4.
The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.
ASA TCP Connection Flags
When you troubleshoot TCP connections through the Adaptive Security Appliance (ASA), the connection flags shown for each TCP connection provide a wealth of information about the state of TCP connections to the ASA. This information can be used to troubleshoot problems with the ASA, as well as problems elsewhere in the network.
Here is the output of the show conn protocol tcp command, which shows the state of all TCP connections through the ASA. These connections can also be seen with the show conn command.
The next picture shows the ASA TCP Connection flags at different stages of the TCP state machine. The connection flags can be seen with the show conn command on the ASA.
TCP Connection Flag Values
Additionally, in order to view all of the possible connection flags issue the show connection detail command on the command-line: