1.\" $KAME: ip6addrctl.8,v 1.3 2003/03/22 05:56:41 jinmei Exp $ 2.\" 3.\" Copyright (C) 2001 WIDE Project. 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. Neither the name of the project nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.Dd January 29, 2025 31.Dt IP6ADDRCTL 8 32.Os 33.\" 34.Sh NAME 35.Nm ip6addrctl 36.Nd configure address selection policy for IPv6 and IPv4 37.\" 38.Sh SYNOPSIS 39.Nm 40.Op Fl j Ar jail 41.Op Cm show 42.Nm 43.Op Fl j Ar jail 44.Cm add 45.Ar prefix precedence label 46.Nm 47.Op Fl j Ar jail 48.Cm delete 49.Ar prefix 50.Nm 51.Op Fl j Ar jail 52.Cm flush 53.Nm 54.Op Fl j Ar jail 55.Cm install 56.Ar configfile 57.\" 58.Sh DESCRIPTION 59The 60.Nm 61utility manages the policy table of source and destination address 62selection for outgoing IPv4 and IPv6 packets. 63When 64.Nm 65is invoked without an argument or with a single argument 66.Cm show , 67it prints the content of the policy table currently installed in the 68kernel. 69.Pp 70To operate inside a jail, the option 71.Op Fl j Ar jail 72should precede other options. 73.Pp 74To modify the table, the following operations are available: 75.Bl -tag -width indent 76.It Cm add Ar prefix precedence label 77Add a policy entry. 78The 79.Ar prefix 80argument 81is an IPv6 prefix, which is a key for the entry. 82An IPv4 prefix should be specified with an IPv6 prefix using an 83IPv4-mapped IPv6 address. 84The 85.Ar precedence 86and 87.Ar label 88arguments 89are decimal numbers, which specify the precedence and label values 90for the entry, respectively. 91This operation should be performed without an existing entry for the 92prefix. 93.It Cm delete Ar prefix 94Delete a policy entry specified by 95.Ar prefix , 96which should be an IPv6 prefix. 97A corresponding entry for the prefix should have already been 98installed. 99.It Cm flush 100Delete all existing policy entries in the kernel. 101.It Cm install Ar configfile 102Install policy entries from a configuration file named 103.Ar configfile . 104The configuration file should contain a set of policy entries. 105Each entry is specified in a single line which contains an IPv6 prefix, 106a decimal precedence value, and a decimal label value, separated with 107white space or tab characters. 108In the configuration file, lines beginning with the pound-sign 109.Pq Ql # 110are 111comments and are ignored. 112Note that the configuration file will be processed before attaching to a jail. 113.El 114.\" 115.Sh EXIT STATUS 116.Ex -std 117.\" 118.Sh SEE ALSO 119.Xr getaddrinfo 1 , 120.Xr getaddrinfo 3 121.Rs 122.%A "Dave Thaler" 123.%A "Richard Draves" 124.%A "Arifumi Matsumoto" 125.%A "Tim Chown" 126.%T "Default Address Selection for Internet Protocol Version 6 (IPv6)" 127.%R RFC 6724 128.Re 129.\" 130.Sh HISTORY 131The 132.Nm 133utility first appeared in the KAME IPv6 protocol stack kit. 134The original command name was 135.Nm addrselect , 136but it was then renamed to the current one so that the name would 137describe its function well. 138.\" .Sh BUGS 139.\" (to be written) 140