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Remove the redundant ipfilter IPv6 rc rules load.

Description

Remove the redundant ipfilter IPv6 rc rules load.

As of ipfilter 5.1.2 the IPv4 and IPv6 rules tables have been merged.
The ipf(8) -6 option has been a NOP since then. Currently the additional
ipf -6 load statement in rc.d/ipfilter simply added the second ipfilter
rules file to the table already populated by the previous ipf command.
Plenty of time has passed since ipfilter 5.1.2 was imported. It is time to
remove the option from rc.conf and the rc script.

Differential Revision: https://reviews.freebsd.org/D28615

Details

Provenance
cyAuthored on Feb 12 2021, 3:17 PM
Differential Revision
D28615: Remove ipfilter IPv6 rc rules specification
Parents
R10:519496a59855: openssh: document two changes that are now upstream
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