Strange AnyConnect IPv6 interfere with IPv4 scenario

I ran across this scenario last week and I don't know if I am missing something simple or if it is a real problem.

Problem: It seems that ip6 can interfere with the IP4 VPN connections.

My network is an extensive network of all the State affecting other agencies of the State (usually by having the firewall between us and them have VPN outside our firewall). Last week I set up a VPN connection to one of these organizations and connect them. The VPN configuration is a scenario of tunnel of split where they use the VPN tunnel for a specific application and all other traffic remains local.

During testing, I noticed that the user could achieve some of their local resources, but not all. After a few basic troubleshooting, we determined that any time the user tried to achieve a local resource who had the ability of the IP6 (Please note that IP6 has not been configured, just cooked in the operating system) that they were not able to access this resource. However, they could reach IP4 resources without any problem. Ip6 was "unchecked" to the NETWORK card on the client and the resource server. Another resource told me that IP6 is impossible to be cut in 2008 and newer because microsoft has linked the many features and services OS inside.

Simple ping tests proved that when the user attempted to reach resources with IP6 "built in" all traffic was trying to use IP6 by default (unless we used the switch-4 to force the IP4). The command prompt window would show a "General failure" when trying to ping any of these resources IP6.

I was able to reproduce this problem in a different environment where a user VPN connects, try to ping several domain controllers and those who are 2008 and most recent attempt to answer over the IP6, then the old boxes answer on IP4. Needless to say that I'm getting nervous because it could alter a ton of services if/when the old domain controllers are upgraded.

Does anyone have experience with this? I'm afraid that IP6 is the Protocol 'default' even when it is not configured and it is originally the users connected with Any Connect unable to access these resources even if the latter running IP4 and.

Looks like that when you prefer IPv4 to IPv6 in Windows 2008 or Windows 8 and restart solve you the problem.

Thank you

Tags: Cisco Security

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