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Redirecting Subscriber Traffic Using ISG Layer 4
Redirect
First Published: March 20, 2006
Last Updated: June 25, 2009
Intelligent Services Gateway (ISG) is a Cisco IOS software feature set that provides a structured
framework in which edge devices can deliver flexible and scalable services to subscribers. This module
describes how to configure ISG to redirect subscriber traffic by using the ISG Layer 4 Redirect feature.
The ISG Layer 4 Redirect feature enables service providers to better control the user experience by
allowing subscriber TCP or User Datagram Protocol (UDP) packets to be redirected to specified servers
for appropriate handling. ISG Layer 4 redirection can be used to facilitate subscriber authentication,
initial and periodic advertising captivation, redirection of application traffic, and DNS redirection.
Finding Feature Information
For the latest feature information and caveats, see the release notes for your platform and software
release. To find information about the features documented in this module, and to see a list of the releases in
which each feature is supported, see the “Feature Information for Redirecting ISG Subscriber Traffic” section
on page 13.
Use Cisco Feature Navigator to find information about platform support and Cisco IOS XE software
image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on
Cisco.com is not required.
Contents
• Prerequisites for Redirecting ISG Subscriber Traffic, page 2
• Restrictions for Redirecting ISG Subscriber Traffic, page 2
• Information About Redirecting ISG Subscriber Traffic, page 2
• How to Configure ISG Layer 4 Redirect, page 3
• Configuration Examples for ISG Layer 4 Redirect, page 9
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