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맨 페이지 이름


System Administration Commands                                    ipaddrsel(8)

       ipaddrsel - configure IPv6 default address selection


       /usr/sbin/ipaddrsel -f file

       /usr/sbin/ipaddrsel -d

       Use  the ipaddrsel utility to configure the IPv6 default address selec‐
       tion policy table. The policy table is a longest-matching-prefix lookup
       table  that  is used for IPv6 source address selection and for destina‐
       tion address ordering when resolving names to AF_INET6 addresses. For a
       description  of  how the policy table is used for source address selec‐
       tion, see inet6(4P). For a description of how the policy table is  used
       for destination address ordering, see getaddrinfo(3C).

       The  unmodified policy table is valid for all typical IPv6 deployments.
       Modify the table only if a circumstance exists for  which  the  default
       behavior  of  the  IPv6 source address selection or destination address
       ordering mechanism is unsatisfactory.  See  the  Examples  section  for
       examples  of  such  circumstances.  You  should carefully consider your
       addressing strategy before you  change  the  table  from  the  provided

       When the ipaddrsel command is issued without any arguments, the address
       selection policy currently in use is printed. The format of the  output
       is  compatible  with  the  format of the configuration file that the -f
       option accepts.

       Note -

         If the usesrc subcommand to ifconfig(8) is applied  to  a  particular
         physical  interface,  the  selection policy specified by usesrc over‐
         rides the source address selection policies specified  by  ipaddrsel.
         This  is true for packets that are locally generated and for applica‐
         tions that do not choose a non-zero source address using bind(3C).

   The Configuration File
       The configuration file that the -f option accepts  can  contain  either
       comment  lines or policy entries. Comment lines have a '#' character as
       the first non-blank character. and they are ignored  by  the  ipaddrsel
       utility. Policy entry lines have the following format:

         prefix/prefix_length precedence label [# comment]

       The prefix must be an IPv6 prefix in a format consistent with inet(3C).
       The prefix_length is an integer ranging from 0 to 128. The IPv6  source
       address selection and destination address ordering algorithms determine
       the precedence or label of an address by doing  a  longest-prefix-match
       lookup  using the prefixes in this table, much like next-hop determina‐
       tion for a destination is done by doing a  longest-prefix-match  lookup
       using an IP routing table.

       The precedence is a non-negative integer that represents how the desti‐
       nation address ordering mechanism will  sort  addresses  returned  from
       name lookups. In general, addresses with a higher precedence will be in
       front of addresses with a lower precedence. Other factors, such as des‐
       tinations  with  undesirable  source  addresses  can, however, override
       these precedence values.

       The label is a string of at most fifteen characters, not including  the
       NULL terminator. The label allows particular source address prefixes to
       be used with destination prefixes of the same label. Specifically,  for
       a  particular  destination  address,  the IPv6 source address selection
       algorithm prefers source addresses whose label is  equal  that  of  the

       The label may be followed by an optional comment.

       The  file  must  contain a default policy entry, which is an entry with
       ::0/0 as its prefix and prefix_length. This is to ensure that all  pos‐
       sible addresses match a policy.

       The ipaddrsel utility supports the following options:

       -f file    Replace  the  address selection policy table with the policy
                  specified in the file.

       -d         Revert the kernel's address selection policy table  back  to
                  the  default  table.  Invoking  ipaddrsel  in  this way only
                  changes the currently running  kernel's  policy  table,  and
                  does   not  alter  the  configuration  file  /etc/inet/ipad‐
                  drsel.conf. To revert the configuration  file  back  to  its
                  default  settings, use ipaddrsel  -d, then dump the contents
                  of the table to the configuration file  by  redirecting  the
                  output of ipaddrsel to /etc/inet/ipaddrsel.conf.

                    example# ipaddrsel -d
                    example# ipaddrsel > /etc/inet/ipaddrsel.conf

       Example 1 The Default Policy in /etc/inet/ipaddrsel.conf

       The  following  example  is  the  default  policy  that  is  located in

         # Prefix                            Precedence Label
         ::1/128                             50 Loopback
         ::/96                               20 IPv4_Compatible
         ::ffff:                   10 IPv4
         2002::/16                           30 6to4
         ::/0                                40 Default

       Example 2 Assigning a Lower Precedence  to  Link-local  and  Site-local

       By  default,  the  destination address ordering rules sort addresses of
       smaller scope before those of larger scope.  For  example,  if  a  name
       resolves  to  a global and a site-local address, the site local address
       would be ordered before the global address. An administrator can  over‐
       ride this ordering rule by assigning a lower precedence to addresses of
       smaller scope, as the following table demonstrates.

         # Prefix                             Precedence Label
         ::1/128                              50 Loopback
         ::/0                                 40 Default
         2002::/16                            30 6to4
         fec0::/10                            27 Site-Local
         fe80::/10                            23 Link-Local
         ::/96                                20 IPv4_Compatible
         ::ffff:                    10 IPv4

       Example 3 Assigning Higher Precedence to IPv4 Destinations

       By default, IPv6 addresses are ordered in front of  IPv4  addresses  in
       name  lookups.  ::ffff:  has  the  lowest  precedence  in the
       default table. In the following example, IPv4  addresses  are  assigned
       higher precedence and are ordered in front of IPv6 destinations:

         # Prefix                             Precedence Label
         ::1/128                              50 Loopback
         ::/0                                 40 Default
         2002::/16                            30 6to4
         ::/96                                20 IPv4_Compatible
         ::ffff:                    60 IPv4

       Example 4 Ensuring that a Particular Source Address is Used

       This example ensures that a particular source address is used only when
       communicating with destinations in a particular network.

       The following policy table assigns a label of 5 to a particular  source
       address  on  the local system, 2001:1111:1111::1. The table assigns the
       same label to a network, 2001:2222:2222::/48. The result of this policy
       is  that  the  2001:1111:1111::1  source address will only be used when
       communicating with destinations contained  in  the  2001:2222:2222::/48
       network.  For  this example, this network is the ClientNet, which could
       represent a particular client's network.

         # Prefix                              Precedence Label
         ::1/128                               50 Loopback
         2001:1111:1111::1/128                 40 ClientNet
         2001:2222:2222::/48                   40 ClientNet
         ::/0                                  40 Default
         2002::/16                             30 6to4
         ::/96                                 20 IPv4_Compatible
         ::ffff:                     10 IPv4

       This example assumes that the local system has one physical  interface,
       and that all global prefixes are assigned to that physical interface.

       ipaddrsel returns the following exit values:

       0     ipaddrsel successfully completed.

       >0    An error occurred. If a failure is encountered, the kernel's cur‐
             rent policy table is unchanged.

       /etc/inet/ipaddrsel.conf    The file that  contains  the  IPv6  default
                                   address selection policy to be installed at
                                   boot time. This file is loaded  before  any
                                   Internet services are started.

       See attributes(7) for descriptions of the following attributes:

       tab()  box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
       TRIBUTE VALUE _ Availabilitysystem/network _ Interface StabilityCommit‐

       getaddrinfo(3C), inet(3C), inet6(4P), ipaddrsel.conf(5), attributes(7),

       The ipnodes cache kept by nscd(8) contains addresses that  are  ordered
       using  the  destination address ordering algorithm, which is one of the
       reasons why ipaddrsel is called before nscd in the  boot  sequence.  If
       ipaddrsel is used to change the address selection policy after nscd has
       started, you should invalidate the nscd ipnodes cache by  invoking  the
       following command:

         example# /usr/sbin/nscd -i ipnodes

Oracle Solaris 11.4               27 Nov 2017                     ipaddrsel(8)
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