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System Administration Guide: IP Services

ProcedureHow to Configure a User-Specified IPv6 Token

The next instructions are particularly useful for servers whose interfaces are routinely replaced. They also are valid for configuring user-specified tokens on any IPv6 node.

  1. Verify that the interface you want to configure with a token is plumbed.

    An interface must be plumbed before you can configure a token for its IPv6 address.


    # ifconfig -a6


    qfe0: flags=2000841 <UP,RUNNING,MULTICAST,IPv6> mtu 1500 index 2
        ether 0:3:ba:13:14:e1 
        inet6 fe80::203:baff:fe13:14e1/10

    This output shows that the network interface qfe0 is plumbed and has the link-local address fe80::203:baff:fe13:14e1/10. This address was automatically configured during installation.

  2. Create one or more 64-bit hexadecimal numbers to be used as tokens for the node's interfaces. For examples of tokens, refer to Link-Local Unicast Address.

  3. Configure each interface with a token.

    Use the following form of the ifconfig command for each interface to have a user-specified interface ID (token):


    ifconfig interface inet6  token address/64

    For example, you would use the following command to configure interface qfe0 with a token:


    # ifconfig qfe0 inet6 token ::1a:2b:3c:4d/64

    Repeat this step for every interface that will have a user-specified token.

  4. (Optional) Make the new IPv6 address persist across reboots.

    1. Edit or create an /etc/hostname6.interface file for each interface you configured with a token.

    2. Add the following text at the bottom of each /etc/hostname.6interface file:


      token ::token-name/64

      For example, you might add the following text to the bottom of an/etc/hostname6.interface file:


      token ::1a:2b:3c:4d/64

    After the system reboots, the token that you configured in an /etc/hostname6.interface file is applied to the interface's IPv6 address. This IPv6 address remains persistent across subsequent reboots.

  5. Update the IPv6 daemon with your changes.


    # pkill -HUP -in.ndpd
Example 7–6 Configuring a User-Specified Token on an IPv6 Interface

In the following example, the interface bge0:1 has an autoconfigured IPv6 address. The subnet prefix 2001:db8:3c4d:152:/64 is advertised by a router on the node's local link. The interface ID 2c0:9fff:fe56:8255 is generated from bge0:1's MAC address.


# ifconfig -a6
lo0: flags=2002000849 <UP,LOOPBACK,RUNNING,MULTICAST,IPv6,VIRTUAL> mtu 8252 index 1
        inet6 ::1/128
bge0: flags=2100801 <UP,MULTICAST,IPv6> mtu 1500 index 5
        inet6 fe80::2c0:9fff:fe56:8255/10
        ether 0:c0:9f:56:82:55
bge0:1: flags=2180801 <UP, MULTICAST,ADDRCONF,IPv6>mtu 1500 index 5
        inet6 2001:db8:3c4d:152:c0:9fff:fe56:8255/64
# ifconfig bge0 inet6 token ::1a:2b:3c:4d/64
# vi /etc/hostname6.bge0
token ::1a:2b:3c:4d/64
# pkill -HUP -in.ndpd
# ifconfig -a6
lo0: flags=2002000849 <UP,LOOPBACK,RUNNING,MULTICAST,IPv6,VIRTUAL> mtu 8252 index 1
        inet6 ::1/128
bge0: flags=2100801 <UP,MULTICAST,IPv6> mtu 1500 index 5
        inet6 fe80::2c0:9fff:fe56:8255/10
        ether 0:c0:9f:56:82:55
bge0:1: flags=2180801 <UP, MULTICAST,ADDRCONF,IPv6>mtu 1500 index 5
        inet6 2001:db8:3c4d:152:1a:2b:3c:4d/64

After the token is configured, the global address on the second status line of bge0:1 now has 1a:2b:3c:4dconfigured for its interface ID.

See Also