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IP6ADDRCTL(8) FreeBSD System Manager's Manual IP6ADDRCTL(8) NAME ip6addrctl - configure address selection policy for IPv6 and IPv4 SYNOPSIS ip6addrctl [-j jail] [show] ip6addrctl [-j jail] add prefix precedence label ip6addrctl [-j jail] delete prefix ip6addrctl [-j jail] flush ip6addrctl [-j jail] install configfile DESCRIPTION The ip6addrctl utility manages the policy table of source and destination address selection for outgoing IPv4 and IPv6 packets. When ip6addrctl is invoked without an argument or with a single argument show, it prints the content of the policy table currently installed in the kernel. To operate inside a jail, the option [-j jail] should precede other options. To modify the table, the following operations are available: add prefix precedence label Add a policy entry. The prefix argument is an IPv6 prefix, which is a key for the entry. An IPv4 prefix should be specified with an IPv6 prefix using an IPv4-mapped IPv6 address. The precedence and label arguments are decimal numbers, which specify the precedence and label values for the entry, respectively. This operation should be performed without an existing entry for the prefix. delete prefix Delete a policy entry specified by prefix, which should be an IPv6 prefix. A corresponding entry for the prefix should have already been installed. flush Delete all existing policy entries in the kernel. install configfile Install policy entries from a configuration file named configfile. The configuration file should contain a set of policy entries. Each entry is specified in a single line which contains an IPv6 prefix, a decimal precedence value, and a decimal label value, separated with white space or tab characters. In the configuration file, lines beginning with the pound-sign (`#') are comments and are ignored. Note that the configuration file will be processed before attaching to a jail. EXIT STATUS The ip6addrctl utility exits 0 on success, and >0 if an error occurs. SEE ALSO Dave Thaler, Richard Draves, Arifumi Matsumoto, and Tim Chown, Default Address Selection for Internet Protocol Version 6 (IPv6), RFC 6724. HISTORY The ip6addrctl utility first appeared in the KAME IPv6 protocol stack kit. The original command name was addrselect, but it was then renamed to the current one so that the name would describe its function well. FreeBSD 14.1-RELEASE-p8 January 29, 2025 FreeBSD 14.1-RELEASE-p8