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This is actually possible with some delay on WAN being down with a CARP script, put this on both the backup and master and it triggers on every CARP event. If it's MASTER it brings up the WAN interface, if it's BACKUP then it downs the WAN interface. This lets you share MAC addresses on the WAN interface, and if the CARP master is swapped it gets you back up with a short delay, <5sec, which isn't perfect HA like if you had 3 VIPs but it should be better than manually switching :)
Change opt4 to your WAN interface name, make sure if it's different on backup/master you name it appropriately

Code Select Expand

/usr/local/etc/rc.syshook.d/carp/50-DHCP ->
if this code doesn't work you can find it in the pastebin https://pastebin.com/1YRPPdpe

#!/usr/local/bin/php
<?php
require_once("config.inc");
require_once("interfaces.inc");
require_once("util.inc");
$subsystem = !empty($argv[1]) ? $argv[1] : '';
$type = !empty($argv[2]) ? $argv[2] : '';
if ($type != 'MASTER' && $type != 'BACKUP') {
    log_error("Carp '$type' event unknown from source '{$subsystem}'");
    exit(1);
}
if (!strstr($subsystem, '@')) {
    log_error("Carp '$type' event triggered from wrong source '{$subsystem}'");
    exit(1);
}
foreach($config['interfaces'] as $ifkey => $interface) {
    if ($ifkey=='opt4') {
        if ($type == 'MASTER') {
            log_msg("Carp Status is now Master!");
            log_msg("Enabling interface: $ifkey - {$interface['if']}");
            shell_exec("/sbin/ifconfig {$interface['if']} up");
            $config['interfaces'][$ifkey]['enable'] = '1';
            write_config("enable interface '$ifkey' due CARP event '$type'", false);
            interface_configure(false, $ifkey, false, false);
            sleep(1);
            log_msg("Restarting DHCPD");
            shell_exec('pluginctl -s dhcpd restart');
            sleep(1);
            log_msg("Issueing dhclient command to request a DHCP lease");
            shell_exec("dhclient {$interface['if']}");
        } else if ($type == 'BACKUP') {
            log_msg("Carp Status is now Backup!");
            log_msg("Disabling interface: $ifkey - {$interface['if']}");
            shell_exec("/sbin/ifconfig {$interface['if']} down");
            unset($config['interfaces'][$ifkey]['enable']);
            write_config("disable interface '$ifkey' due CARP event '$type'", false);
            interface_configure(false, $ifkey, false, false);
            log_msg("Stopping DHCPD");
            shell_exec('pluginctl -s dhcpd stop');
        }
    }
}