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When traveling to guest Wifis, e.g., at different customers sites, hotels, or public Wifis in general, I often have only IPv4 access to the Internet. Since I do not want to use IPv6 tunneling protocols such as Teredo, I decided to use the Cisco AnyConnect Secure Mobility Client to tunnel IPv6 between my test laboratory (Cisco ASA) and my computer. With a few changes on the ASA, my computer now gets a private IPv4 address and a global unicast IPv6 address out of my space at home. Since I am using a VPN tunnel to access the Internet from untrusted Wifis anyway, the overall process did not change that much.
In the following I am showing a few screenshots but not a complete configuration guide for the AnyConnect Client.
(I assume that there is an AnyConnect Secure Mobility Client in place and running already. I also assume that native IPv6 is configured on the outside interface of the Cisco ASA as well.)
Cisco AnyConnect is a modular software that combines IPSec IKEv2 and VPN access using SSL. It offers additional built-in models for web security, including Cisco Cloud Web Security and networking roaming protection (Cisco Umbrella). Here are the six major features that define Cisco AnyConnect. The Cisco AnyConnect Secure Mobility Solution provides a comprehensive, highly secure enterprise mobility solution. The Cisco AnyConnect Secure Mobility Solution continues to lead with next-generation security and encryption, including support for the Suite B set of cryptographic algorithms, and support for IPv6 networks.
Note that this post is one of many related to IPv6. Click here for a structured list.
Full IPv4 and IPv6 Tunnel
If so, there are only two steps to activate IPv6 for the VPN tunnel: The creation of an IPv6 pool and the allocation of that pool in the connection profile:
If a connection is made to this connection profile (in many cases over an IPv4-only network), the AnyConnect client gets addresses from both protocols:
In the VPN monitoring section of the Cisco ASDM, both IPv4/IPv6 addresses are shown, too:
That’s it. ;) Works perfectly for me.
Split Tunnel IPv4 – Full Tunnel IPv6
I also configured another group policy which tunnels only my private IPv4 networks and the complete IPv6 space. I am using this policy when I reside on trusted networks that only have IPv4 access to the Internet. However, this lead to strange behaviours with Windows 7 since IPv6 was NOT preferred over IPv4 anymore and IPv6 domain lookups did not work anymore, too. The result was, that simple “ping ipv6-only-host” commands threw an error such as “unknown host”, PuTTY was not able to get the IPv6 address of IPv6 hosts in general, and web browsers used IPv4 per default. But IPv6 still worked if it was requested specifically such as “ping -6 ipv6-only-host”.
![Anyconnect ipsec Anyconnect ipsec](/uploads/1/1/8/0/118023186/985107264.jpg)
The AnyConnect route details looked quite ok:
But the system did not use IPv6 until the user triggered it explicitly:
Some troubleshooting with Wireshark revealed that in the first case (when pinging a host such as ping facebook.com ) Windows ONLY requested a type A record via DNS. But as I did a ping -6 facebook.com , it requested a type AAAA record. More interestingly, Windows did not use the configured DNS server in the group policy from the AnyConnect profile (in my case: 8.8.8.8), but the DNS server that is configured on the hardware interface. (Note the time gap between both DNS requests as a result from my two different pings above):
Solution: After I added the 8.8.8.8 IPv4 address to the tunneled network list in the group policy, Windows used this DNS server and requested both records (A and AAAA) directly. The following screenshot shows the DNS requests as I did a simple ping facebook.com without the “-6” option. (No time gap between both requests anymore):
Now, the Route Details pane from AnyConnect looks like that:
Flashdevelop for mac. Short summary:
- If only the private IPv4 networks are tunneled, Windows initiates DNS queries from its hardware interface and sends these requests to the DNS server that is configured on that hardware interface. Furthermore, Windows only requests the type A record.
- If additionally the IPv4 DNS server address is tunneled (in my case the 8.8.8.8), Windows initiates DNS requests from the AnyConnect interface and sends the requests to the DNS server that is configured in the Cisco ASA group policy. In this case, Windows also requests the type AAAA records, since the initiating interface is capable of IPv6.
Featured image “East Side Access Progress: May 21, 2014” by Metropolitan Transportation Authority of the State of New York is licensed under CC BY 2.0.
Windows Vista/7/8/8.1/10 (32 or 64 bit) Anyconnect Client Installation
Cisco Anyconnect Ipsec
- Browse to NS VPN Client Download Page
- Start the 'anyconnect-win' installer downloaded in step 2.
- At each prompt, click 'Next.' You may see a 'User Account Control' dialog box asking if you would like to install the program. Click 'Yes.'
- Once the install is complete, click 'Finish.'
- Start the 'anyconnect-win-gina' installer downloaded in step 2.
- At each prompt, click 'Next.' You may see a 'User Account Control' dialog box asking if you would like to install the program. Click 'Yes.'
- Once the install is complete, click 'Finish.'
- The machine will now ask to reboot. Click yes to reboot.
- Launch the client by going to Start->All Programs->Cisco->Cisco Anyconnect Secure Mobility Client
- In the field to the left of the 'Connect' button, click on the text area and type 'vpn.ufl.edu'. Click connect.
- Authenticate with your gatorlink ID (in the form of [email protected]) and your gatorlink password. Click OK.
- The most recent version of the client and vpn configuration files will be automatically downloaded. This may require another reboot to complete the update.
- Your client is now ready for use.
Anyconnect Ipsec Vpn
Notes:
![Anyconnect Anyconnect](/uploads/1/1/8/0/118023186/340317034.png)
Ipsec Vpn Cisco Asa
- Once the Anyconnect is installed on your machine, it will always be automatically upgraded to the latest version as they are published by Network Services. You shouldn't need to go through the manual installation process unless you reinstall your operating system, or your client becomes corrupted and needs to be uninstalled and reinstalled.
- After connecting for the first time, the VPN policy will be pushed to your client. The pulldown will say 'Gatorlink VPN' rather than vpn.ufl.edu after this policy is downloaded.