User`s guide

AT&T Global Network Client for Windows Administrator’s Guide
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Network Client IPSec Failover setting to Y. To configure this option in the AT&T Global Network Client,
click Settings menu; then Login Properties. Click the Preferences tab; scroll down and click Use SSL
Tunneling when an IPSec connection cannot be established in the VPN Details section.
IPv6 Support
Support for the following IP version tunneling scenarios is available when using IPSec or SSL-T VPN
terminating to an AT&T VPN Server (SIG or VIG):
• IPv6 over IPv4
• IPv6 and IPv4 over IPv4
• IPv4 over IPv6
• IPv4 and IPv6 over IPv6
Tunneling is automatic and transparent to the user. IP Address configuration occurs during tunnel setup
when the VPN server assigns the VPN Client address(s).
Figure 46: IPv6 Support