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This chapter tells you how to customize iChat to create 
advanced configurations.

iChat provides the following advanced configuration options:

 “Linking Multiple Chat Servers (S2S)” on page 27
 “Securing S2S Connections” on page 28
 “Integrating with Directory Services” on page 30
 “Setting the iChat Authentication Method” on page 30
 “Using Certificates to Secure S2S Communication” on page 28
 “Setting Up iChat on Virtually Hosted Domains” on page 31

Linking Multiple Chat Servers (S2S)

Use Server Admin to configure an expanded set of options for server-to-server (S2S) 
communication. For more information, see “Setting Up S2S Communication” on 
page 27.

Ideally, any server can allow S2S communication, as long as the server is XMPP 
compliant, accessible to the Internet, and not behind a firewall.

To learn more, see the following topics:

 “Setting Up S2S Communication” on page 27
 “Securing S2S Connections” on page 28

Use Server Admin to establish S2S communication. When the S2S federation is enabled, 
communication with most other XMPP-compliant chat servers is enabled, including the 
ability to federate with Google Talk.

To establish communication between servers on different networks, administrators 
must configure domain name server (DNS), network address tranlation (NAT), and 
firewalls, as needed. For more information, see Network Services Administration.