[Remote Access VPN] IPv6 address Auto-configuration over IPsec


By enabling IPv6 address Auto-configuration over IPsec, a remote client can execute IPv6 address Auto-configuration for a VPN interface (a TUN/TAP virtual interface). The IPv6 addresses can be used as source addresses to communicate with internal hosts on protected remote network/LAN.

This is a Rockhopper's private extension.

IPv6 address Auto-configuration (IPv6 Router Advertisement) by internal router needs to be enabled on protected remote network/LAN.


- Configure a remote configuration server - A gateway/concentrator node


  1. Open Rockhopper Web Console and login.

  2. Load a VPN realm's configuration.

    - VPN Configuration[Tab] > VPN Realms[Left-Tree]

  3. Setup Service.

    - VPN Configuration[Tab] > VPN Realms[Left-Tree] > Realm ID: Realm Name[Left-Tree]
    > Service[Left-Tree]: Click this tree node and show Service pane.

    - Remote Configuration(IKEv2): Select Remote Configuration Server.

  4. Setup Remote Config Server.

    - VPN Configuration[Tab] > VPN Realms[Left-Tree] > Realm ID: Realm Name[Left-Tree]
    >Service[Left-Tree] > Remote Config Server[Left-Tree]:

    Click this tree node and show Remote Configuration Server(IKEv2) pane.

  5. Setup Remote Configuration Server - Options.

    - Remote Configuration Server(IKEv2)[Pane] > Options[Tab]:

    - Check Allow IPv6 address Auto-configuration for remote clients.

    - If needed, check the followings.

    - Don't forward packets between remote clients
        - Allow only link-local ICMPv6 for IPv6 address Auto-configuration.

  6. Save this realm's configuration.

    - VPN Configuration[Tab] > Edit VPN Realm(Save, Add, etc.)[Left-Tree]:
    Click this tree node and show Edit VPN Realm(Save, Add, Remove, or Load) pane.

    - Click Save Configuration button.


Also, you can configure an IPv6 internal address pool as usual. If a remote client (like a Windows 7/8/10 client) doesn't support or enable IPv6 address Auto-configuration over IPsec, the pool is used instead.



- Configure a remote client


IPv6 address Auto-configuration for a remote client is enabled by default. If you want to change it, show Advanced Settings.

  1. Open Rockhopper Web Console and login.

  2. Load a VPN realm's configuration and check Advanced Settings.

    - VPN Configuration[Tab] > VPN Realms[Left-Tree]

  3. Setup VPN Interface.

    - VPN Configuration[Tab] > VPN Realms[Left-Tree] > Realm ID: Realm Name[Left-Tree]
    > VPN Interface[Left-Tree]: Click this tree node and show VPN Tunnel/TAP Interface pane.

    - Enter the following.

    Internal Address Type: Auto(IKEv2 Configuration)

    - Check or uncheck Enable IPv6 address Auto-configuration. (Rockhopper's private extension)

  4. Setup Service.

    - VPN Configuration[Tab] > VPN Realms[Left-Tree] > Realm ID: Realm Name[Left-Tree]
    > Service[Left-Tree]: Click this tree node and show Service pane.

    - Remote Configuration(IKEv2): Select Remote Access Client.

  5. Save this realm's configuration.

    - VPN Configuration[Tab] > Edit VPN Realm(Save, Add, etc.)[Left-Tree]:
    Click this tree node and show Edit VPN Realm(Save, Add, Remove, or Load) pane.

    - Click Save Configuration button.




- A configuration example




- Protocol details

See comments and source codes in [rockhopper/app/rhp_ikev2_cfg.c].
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