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Cisco IPSEC VPN Client Issues with IPv6

I have a sales user that works out of his home.  He uses a Windows 7 laptop inconjunction with a Cisco IPSEC VPN client to connect back to our corporate office.  Prior to him receiving his Windows 7 laptop while he was still on XP, he had no problems connecting to VPN nor accessing internal resources.  Now that he has gotten his Windows 7 laptop, he can connect to the VPN client but once connected he cannot access any resources.  After first I thought it was a DNS resolution issue but after further investigation, I notice he cannot ping IP addresses either.  

If we take his laptop to any other location other than his house it works fine.  After further investigation, it appears that his ISP is now utilizing IPv6.  Is this what is causing the issues I am having?
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Neptune IT
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Neptune IT
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cstosgaleCommented:
Doubtful. I would get him to install the latest client version, and try turning off the windows firewall.
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Neptune ITAuthor Commented:
We have done both of these.
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cstosgaleCommented:
Get him to try it from a different network, e.g. Internet cafe etc. And if he is using wireless, get him to try via a cable or vice versa in case it is network driver related.
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Neptune ITAuthor Commented:
We have done this as well.  He can go to other locations (Internet Cafe, Hotels, etc) and use both his wired and his wireless and they both work fine.
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cstosgaleCommented:
Ah ok so it only doesn't work when he's at home. Nothing to do with his PC then. It is unlikely that his ISP is totally ipv6 a it is currently very unusual. Therefore most likely it is at least dual stack. Most likely this will be an issue with his router. I would check for any IPSec pass through options.
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Neptune ITAuthor Commented:
Actually, he does not even have any type of router in place.  He plugs his laptop directly into his modem.  When he plugs his older Windows XP system directly into the modem, it works fine.  I assume this is becasue Windows XP doesn't support IPv6.  Should I look at putting a router in place?
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cstosgaleCommented:
You could disable ipv6 on his laptop, although i am not sure why this would cause this issue.

http://www.addictivetips.com/windows-tips/how-to-disable-ipv6-in-windows-7/
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Neptune ITAuthor Commented:
I put a Linksys Router in place and it resolved the issue.  For some reason, disabling IPv6 did not resolve the issue.
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Neptune ITAuthor Commented:
I have resolved the problem myself.
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