Example 11-1 /etc/inet/ndpd.conf File

The following example shows how the keywords and configuration variables are used in the ndpd.conf file. Remove the comment (#) to activate the variable.

# ifdefault      [variable-value ]*
# prefixdefault [variable-value ]*
# if ifname   [variable-value ]*
# prefix prefix/length ifname
#
#  Per interface configuration variables
#
#DupAddrDetectTransmits
#AdvSendAdvertisements
#MaxRtrAdvInterval
#MinRtrAdvInterval
#AdvManagedFlag
#AdvOtherConfigFlag
#AdvLinkMTU
#AdvReachableTime
#AdvRetransTimer
#AdvCurHopLimit
#AdvDefaultLifetime
#
# Per Prefix:  AdvPrefixList configuration variables
#
#
#AdvValidLifetime
#AdvOnLinkFlag
#AdvPreferredLifetime
#AdvAutonomousFlag
#AdvValidExpiration
#AdvPreferredExpiration

ifdefault AdvReachableTime 30000 AdvRetransTimer 2000
prefixdefault AdvValidLifetime 240m AdvPreferredLifetime 120m

if qe0 AdvSendAdvertisements 1
prefix 2:0:0:56::/64 qe0
prefix fec0:0:0:56::/64 qe0

if qe1 AdvSendAdvertisements 1
prefix 2:0:0:55::/64 qe1
prefix fec0:0:0:56::/64 qe1

if hme1 AdvSendAdvertisements 1
prefix  2002:8192:56bb:1::/64 qfe0 

if hme1 AdvSendAdvertisements 1
prefix  2002:8192:56bb:2::/64 hme1

IPv6 Interface Configuration File

IPv6 uses the /etc/hostname6.interface file at start up to automatically define IPv6 logical interfaces. When you select the IPv6 Enabled option during Solaris installation, the installation program creates an /etc/hostname6.interface file for the primary network interface, in addition to the /etc/hostname.interface file.

If more than one physical interface is detected during installation, you are prompted as to whether you want to configure these interfaces. The installation program creates IPv4 physical interface configuration files and IPv6 logical interface configuration files for each additional interface that you indicate.

As with IPv4 interfaces, you can also configure IPv6 interfaces manually, after Solaris installation. You create/etc/hostname6.interface files for the new interfaces. For instructions for manually configuring interfaces, refer to Chapter 6, Administering Network Interfaces (Tasks).

The network interface configuration file names have the following syntax:

hostname.interface
hostname6.interface

The interface variable has the following syntax:

dev[.module[.module ...]]PPA

The syntax [.[.]] is also accepted.

Example 11-2 IPv6 Interface Configuration Files

The following are examples of valid IPv6 configuration file names:

hostname6.qfe0
hostname.ip.tun0
hostname.ip6.tun0
hostname6.ip6to4tun0
hostname6.ip.tun0
hostname6.ip6.tun0

/etc/inet/ipaddrsel.conf Configuration File

The /etc/inet/ipaddrsel.conf file contains the IPv6 default address selection policy table. When you install the Solaris OS with IPv6 enabled, this file contains the contents that are shown in Table 11-5.

You can edit the contents of /etc/inet/ipaddrsel.conf. However, in most cases, you should refrain from modifying this file. If modification is necessary, refer to the procedure How to Administer the IPv6 Address Selection Policy Table. For more information on ippaddrsel.conf, refer to Reasons for Modifying the IPv6 Address Selection Policy Table and the ipaddrsel.conf(4) man page.

IPv6-Related Commands

This section describes commands that are added with the Solaris IPv6 implementation. The text also describes modifications to existing commands to support IPv6.

ipaddrsel Command

The ipaddrsel command enables you to modify the IPv6 default address selection policy table.

The Solaris kernel uses the IPv6 default address selection policy table to perform destination address ordering and source address selection for an IPv6 packet header. The /etc/inet/ipaddrsel.conf file contains the policy table.

The following table lists the default address formats and their priorities for the policy table. You can find technical details for IPv6 address selection in the inet6(7P) man page.

Table 11-5 IPv6 Address Selection Policy Table

In this table, IPv6 prefixes (::1/128 and ::/0) take precedence over 6to4 addresses (2002::/16) and IPv4 addresses (::/96 and ::ffff:0:0/96). Therefore, by default, the kernel selects the global IPv6 address of the interface for packets going to another IPv6 destination. The IPv4 address of the interface has a lower priority, particularly for packets going to an IPv6 destination. Given the selected IPv6 source address, the kernel also uses the IPv6 format for the destination address.

Reasons for Modifying the IPv6 Address Selection Policy Table

Under most instances, you do not need to change the IPv6 default address selection policy table. If you do need to administer the policy table, you use the ipaddrsel command.

You might want to modify the policy table under the following circumstances:

• If the system has an interface that is used for a 6to4 tunnel, you can give higher priority to 6to4 addresses.

• If you want a particular source address to be used only in communications with a particular destination address, you can add these addresses to the policy table. Then, you can use ifconfig to flag these addresses as preferred.

• If you want IPv4 addresses to take precedence over IPv6 addresses, you can change the priority of ::ffff:0:0/96 to a higher number.

• If you need to assign a higher priority to deprecated addresses, you can add the deprecated address to the policy table. For example, site-local addresses are now deprecated in IPv6. These addresses have the prefix fec0::/10. You can change the policy table to give higher priority to site-local addresses.

For details about the ipaddrsel command, refer to the ipaddrsel(1M) man page.