[Bug 191252] New: [rc.conf] [vlan] [carp] broken alias syntax on vlan interfaces

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191252

            Bug ID: 191252
           Summary: [rc.conf] [vlan] [carp] broken alias syntax on vlan
                    interfaces
           Product: Base System
           Version: 10.0-STABLE
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Some People
          Priority: ---
         Component: conf
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: dd at gizmocreative.com

Just upgraded my 9-STABLE pf+carp gateway machines to 10-STABLE, very happy
with the improvements in pf and carp!  I followed the updated instructions in
the handbook (https://www.freebsd.org/doc/handbook/carp.html) to migrate my
/etc/rc.conf settings to match the new syntax required for carp.  Everything
works fine for normal interfaces, but the alias syntax breaks when used with
vlan interfaces.

Here's an example config that doesn't work:

ifconfig_em0="up media 1000baseTX mediaopt full-duplex"
vlans_em0="1 2"
ifconfig_em0_1="inet 1.1.1.1/24"
ifconfig_em0_1_alias0="inet vhid 1 advskew 100 pass foo alias 1.1.1.254/32"
ifconfig_em0_2="inet 2.2.2.2/24"
ifconfig_em0_2_alias0="inet vhid 2 advskew 100 pass foo alias 2.2.2.254/32"

As a workaround, I've created a custom startup script to set these up and
everything works fine.  Just would like to be able to do it via the standard
rc.conf mechanism.

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