Symptom: When connecting or disconnecting the Anyconnect Client running on Windows XP with IPv6 enabled, the connection establishment and connection teardown may take a minute or two. I guess that it is relative to the local policy of your terminal wich enables IPv6 Link local adressing on any interface (and that's normal). My internet connection is. IPv6—Only IPv6 connections can be made to the ASA. This field configures the initial IP protocol and order of fallback. Try connecting again and this time it will and should work and the reason behind is that your adapter chooses IPV6 which may a preferred path by the service provider. It does not affect the IP protocol on the tunnel interface (at least, this is not documented). … Some VPNs allow split tunneling, however, Cisco AnyConnect and many other solutions offer a way for network administrators to forbid this.When that happens, connecting to the VPN seals off the client from the rest of the LAN. Once the client connects to our ASA their internet browsing ability stops as we have split tunneling but Anyconnect is dropping all IPV6 traffic. . Export information from the VPN client to help locate and isolate a connection problem. Disabling IPv6 appears to not resolve the issue nor help the situation. Is there an option to disable IPv6 when connecting AnyConnect? If they disconnect from the VPN, Internet resolution works for them. IPv6 Proxies Monday, November 19, 2018. This is verified via non-stale GPO on the affected machine and Cisco Anyconnect ensures its own virtual network adapter is set to highest priority upon VPN connecting. I run IPv6 on my home network and do not have any issues with the split-dns feature and therefore cannot reproduce their problem. Running Anyconnect 4.3 with ASA code 9.6(3)1. Here are the relevant config additions for reference: group-policy colo-anyconnect-ras attributes, ipv6-split-tunnel-policy tunnelspecified split-tunnel-network-list value colo-ras-split-tunnel, split-dns value domain.com split-tunnel-all-dns disable address-pools value colo-ras ipv6-address-pools value colo-ras-ipv6, ipv6 local pool colo-ras-ipv6 /80 100, access-list colo-ras-split-tunnel extended permit ip Network (Client) Access > AnyConnect Client Profile. We've had a number of them report problems when trying to VPN in to our networks (we use Cisco AnyConnect to connect to Cisco ASAs in a number of locations) & I've been asked to look into the issue. A new pane labeled Cisco AnyConnect VPN Client will pop up. First verify if any IPv6 adaptors are enabled on the MAC machine and check if MAC tries to contact ASA over the IPv6 network. started 2017-01-05 22:52:18 UTC. Start the VPN, authenticate with DUO, VPN connects - at this point they are "on" the network for all intents and purposes. If so, it fails as the IPv6 is not supported with AnyConnect. John W Kerns August 4, 2017. Cisco's AnyConnect software will always use IPv4 if it is available, so this will mostly affect customers using openconnect, or customers that only have IPv6 (which is rare). Anyconnect was simply dropping those packets instead of splitting them out because IPv6 was not enabled in the Anyconnect client. . Troubleshooting Logs. This works fine for most of our users. With the same user account and AnyConnect install on both laptpos, I get connected with one laptop, but not with the other one. 2.3(2016) Description (partial) Symptom: Unable to connect using Anyconnect client. I really am not sure why disabling IPv6 on their client machines would have any affect but it does. The fix is quite simple actually, go to Network Connections from Control Panel, right-click Cisco AnyConnect Security Mobility Client Connection, and choose Properties. View Bug Details in Bug Search Tool. Windows 7 loses IPv6 address after AnyConnect VPN is connected because DHCPv6 renew / rebind replies are not getting to DHCPv6-Client Windows process. . We have a Cisco ASA device and we are using the Cisco AnyConnect VPN client. IPv6, IPv4âFirst attempt to make an IPv6 connection to the ASA. If that is not successful, AnyConnect attempts to initiate the connection using IPv6. Lookups for names sent over the tunnel using split-dns work fine, but any lookups not sent over the tunnel fail. Firepower 6.7 Release Demonstration - Health Monitoring, Troubleshoot Dot1x and Radius in IOS and IOS-XE. 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 … 3. By default AnyConnect initially attempts to connect using IPv4. I am showing the result of "debug webvpn anyconnect 255" command when the connection fails: webvpn_login_transcend_cer t_auth_coo kie: tg_cookie = NULL, tg_name = IT_Tercat To learn how, click here. We use both the split-tunneling and split-dns features to selectively direct network and dns queries to our remote DNS servers and networks. Cisco Bug: CSCtb76577 - Anyconnect connection failure with IPv6. If an IPv4 VPN is established the IPv4 client does not get an IPv6 pool address. ... Out of 200 other users with no tickets or even a mention of a problem. 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