IPv6 with Anyconnect iphone client and ocserv

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I wanted to let this list know some of my observations with getting IPv6 to work on my iPhone with Anyconnect and an ocserv server. I noticed some much older threads on this list but no one got it working as far as I can tell.

I have a personal IPv6 environment where I run ocserv and I hand out iPv6 (and IPv4) addresses to my VPN clients. With CISCO's anyconnect client on my Windows system things work fine. It properly sets things up and installs a default IPv6 route.

On my iPhone anyconnect client, it gets an IPv6 address and a default route (::/0) but no IPv6 packets are routed. While the app states full tunnel mode for IPv6, nothing happens.

However, when I force a route to the IPv6 unicast space with a split route by adding a custom header to my ocserv.conf

	custom-header = "X-CSTP-Split-Include-IP6: 2000::/3"

things work fine. I had to use the custom header because ocserv doesn't send routes to non-openconnect clients.

I'm puzzled why the iPhone client and the Windows client behave differently because they do seem to share quite a lot of code.

	Leendert

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