User`s guide

AT&T Global Network Client for Windows Administrator’s Guide
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IP version preference
The AT&T Global Network Client can be configured to prefer an IP version for establishing a VPN
connection when connected to an IPv4/IPv6 dual stacked network. The default preference is currently
IPv4. This setting is centrally configured through the AT&T administration server.
IP version failover
Granular control over the number of VPN connection attempts to make with the preferred IP version is
supported. This setting is only pertinent on IPv4/IPv6 dual stack networks. The default number of VPN
connection attempts per IP version is defaulted to 2. This setting is centrally configured through the
AT&T administration server.
For example, if there are 3 VPN servers and IPv6 is preferred. The AT&T Global Network Client’s
connection attempt list would be ordered as follows:
1. Attempt VPN server 1 using IPv6.
2. Attempt VPN server 2 using IPv6.
3. Attempt VPN server 1 using IPv4.
4. Attempt VPN server 3 using IPv6.
5. Attempt VPN server 2 using IPv4.
6. Attempt VPN server 3 using IPv4.
OPSWAT Certified VPN
The AT&T Global Network Client VPN is certified through the OPSWAT
Certification Program. This certification demonstrates that the AT&T
Global Network Client VPN is compatible with products from other
market-leading technology vendors. Products carrying OPSWAT
certification follow standards that indicate they will not adversely affect other installed security software.
To learn more, visit the OPSWAT Certification website at http://www.opswat.com/certified.