Syslog Server Cisco Packet Tracer

[Cora Hickel]

Maintaininga user activity record is important in the organization. If there is any loss in the organization or another place in the world, then the last and final stage is to check its user activity. The activity shows how they did it and when they did it. Various tools can collect records of user activity. In this lab, we will use a syslog server in Packet Tracer. A Syslog server is a server that stores and collects user activities. Take a server from the end devices and a router from network devices. Connect both of them through a straight-through cable.

As we configured the IP address on the router and at the Syslog server in the Packet tracer, we will check its connection through the ping command. Click on Server, then in a desktop tab, click on command prompt. Ping the router through 192.168.1.1.

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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, ensure that you understand the potential impact of any command.

External software or hardware is not required when you store the syslog messages in the ASA internal buffer. Enter the show logging command in order to view the stored syslog messages. The internal buffer has a maximum size of 1 MB (configurable with the logging buffer-size command). As a result, it can wrap very quickly. Keep this in mind when you choose a logging level for the internal buffer as more verbose levels of logging can quickly fill, and wrap, the internal buffer.

A server that runs a syslog application is required in order to send syslog messages to an external host. ASA sends syslog on UDP port 514 by default, but protocol and port can be chosen. If TCP is chosen as the logging protocol, this causes the ASA to send syslogs via a TCP connection to the syslog server. If the server is inaccessible, or the TCP connection to the server cannot be established, the ASA, by default, blocks ALL new connections. This behavior can be disabled if you enable logging permit-hostdown. See the configuration guide for more information about the logging permit-hostdown command.

An SMTP server is required when you send the syslog messages in e-mails. Correct configuration on the SMTP server is necessary in order to ensure that you can successfully relay e-mails from the ASA to the specified e-mail client. If this logging level is set to a very verbose level, such as debug or informational, you can generate a significant number of syslogs since each e-mail sent by this logging configuration causes upwards of four or more additional logs to be generated.

Console logging enables syslog messages to display on the ASA console (tty) as they occur. If console logging is configured, all log generation on the ASA is ratelimited to 9800 bps, the speed of the ASA serial console. This can cause syslogs to be dropped to all destinations, which include the internal buffer. Do not use console logging for verbose syslogs for this reason.

Logging monitor enables syslog messages to display as they occur when you access the ASA console with Telnet or SSH and the command terminal monitor is executed from that session. In order to stop the printing of logs to your session, enter the terminal no monitor command.

Users need an existing functional Simple Network Management Protocol (SNMP) environment in order to send syslog messages with SNMP. See Commands for Setting and Managing Output Destinations for a complete reference on the commands you can use to set and manage output destinations. See Messages Listed by Severity Level for messages listed by severity level.

In order to help align and order events, timestamps can be added to syslogs. This is recommended in order to help trace issues based on time. In order to enable timestamps, enter the logging timestamp command. Here are two syslog examples, one without the timestamp and one with:

In either the simple site-to-site VPN design or the more complicated hub-and-spoke design, administrator could want to monitor all remote ASA Firewalls with the SNMP server and syslog server located at a central site.

In order to configure the site-to-site IPsec VPN configuration, refer to PIX/ASA 7.x and above: PIX-to-PIX VPN Tunnel Configuration Example. Apart from the VPN configuration, you have to configure the SNMP and the interesting traffic for the syslog server in both the central and local site.

ASA Version 8.4 provides several mechanisms that enable you to configure and manage syslog messages in groups. These mechanisms include message severity level, message class, message ID, or a custom message list that you create. With the use of these mechanisms, you can enter a single command that applies to small or large groups of messages. When you set up syslogs this way, you are able to capture the messages from the specified message group and no longer all the messages from the same severity.

Enter the logging list message_list level severity_level [class message_class] command in order to create a message list that includes messages with a specified severity level or message list.

Use the message class in order to send all messages associated with a class to the specified output location. When you specify a severity level threshold, you can limit the number of messages sent to the output location.

For advanced troubleshooting, feature/protocol specific debug logs are required. By default, these log messages are displayed on terminal (SSH/Telnet). Dependent on the type of debug, and the rate of debug messages generated, use of the CLI can prove difficult if debugs are enabled. Optionally, debug messages can be redirected to the syslog process and generated as syslogs. These syslogs can be sent to any syslog desination as would any other syslog. In order to divert debugs to syslogs, enter the logging debug-trace command. This configuration sends debug output, as syslogs, to a syslog server.

Enter the logging list command in order to capture the syslog for LAN-to-LAN and Remote access IPsec VPN messages alone. This example captures all VPN (IKE and IPsec) class system log messages with debugging level or higher.

ACLs, by default, log every denied packet. There is no need to add the log option to deny ACLs to generate syslogs for denied packets. When the log option is specified, it generates syslog message 106100 for the ACE to which it is applied. Syslog message 106100 is generated for every matching permit or deny ACE flow that passes through the ASA Firewall. The first-match flow is cached. Subsequent matches increment the hit count displayed in the show access-list command. The default access list logging behavior, which is the log keyword not specified, is that if a packet is denied, then message 106023 is generated, and if a packet is permitted, then no syslog message is generated.

An optional syslog level (0 - 7) can be specified for the generated syslog messages (106100). If no level is specified, the default level is 6 (informational) for a new ACE. If the ACE already exists, then its current log level remains unchanged. If the log disable option is specified, access list logging is completely disabled. No syslog message, which includes message 106023, is generated. The log default option restores the default access list logging behavior.

Enter the logging console message_list severity_level command in order to enable system log messages to display on the Security Appliance console (tty) as they occur. Set the severity_level from 1 to 7 or use the level name. You can also specify which messages are sent with the message_list variable.

Enter the show logging message command in order to display a list of system log message messages that have been modified from the default setting, which are messages that have been assigned a different severity level and messages that have been disabled.

This message appears when you have enabled TCP system log messaging and the syslog server cannot be reached, or when you use Cisco ASA Syslog Server (PFSS) and the disk on the Windows NT system is full. Complete these steps in order to resolve this error message:

You can set the severity that will be displayed/logged for each destination of a syslog message. For example, you can configure logging buffered level which will configure the severity level displayed when you do a show logging. The logging console level will configure the severity level that is displayed on the console. logging monitor level will configure the level that is displayed on vty lines, that is, on connections via SSH and Telnet. Finally, logging trap level will configure the level that will be sent to a syslog sever, if it has been configured.

You could also create a simple EEM script that looks for your APPNAV/WAAS syslog messages, then forwards them to your SNMP server. This ensures that only these syslog messages get forwarded and nothing else.

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