Cisco Systems 2.5 Instant Messaging

10-5
Cisco Router and Security Device Manager 2.5 User’s Guide
OL-4015-12
Chapter10 Application Security
Instant Messaging
Options Column
This column can contain fields if other settings for the chosen application exist.
MAX Data Field
Specifies the maximum number of bytes (data) that can be transferred in a single
Simple Mail Transport Protocol (SMTP) session. After the maximum value is
exceeded, the firewall logs an alert message and closes t he session. Default value:
20 MB.
Secure login Checkbox
Causes a user at a nonsecure location to use encryption for authentication.
Reset
Resets the TCP connection if the client enters a nonprotocol command before
authentication is complete.
Router Traffic
Enables inspection of traffic destined to or originated from a router. Applicable
only for H.323, TCP, and UDP protocols.
Instant Messaging
Use this window to control the traffic for Instant Messaging (IM) applications
such as Yahoo Messenger, and MSN Messenger. To learn about the buttons and
drawers available in the Application Security tab, click Application Security
Windows.
Click Permit, Block, and Alarm Controls to learn how to specify the action the
router takes if it encounters traffic with the characteristics that you specify in this
window.
The following example shows traffic blocked for Yahoo Messenger traffic, and
alarms generated when traffic for that application arrives:
Yahoo Messenger Block Send Alarm (checked)
The SDM_HIGH profile blocks IM applications. If the router uses the
SDM_HIGH profile, and it does not block IM applications, those applications
may have connected to a new server that is not specified in the profile. To enable