OpnSense 24.7 - Disable WAN + OPT2 Interfaces during CARP Failover

10-wancarp

#!/usr/local/bin/php
<?php

require_once("config.inc");
require_once("system.inc");
require_once("interfaces.inc");
require_once("interfaces.lib.inc");
require_once("util.inc");

$subsystem = !empty($argv[1]) ? $argv[1] : '';
$type = !empty($argv[2]) ? $argv[2] : '';

// Add more interfaces that need to be disabled/enabled after a CARP event.
//$iface_aliases = array('wan', 'opt2');
//$iface_names = array('wan' => 'igc0', 'opt2' => 'gif0');
$iface_aliases = array('wan', 'wan');
$iface_names = array('wan' => 'igc0');
$dhcp_ifaces = array('lan', 'opt3', 'opt1');
// Optional if you want the default route removed on the backup system
$lan_vip = 'YOUR_LAN_GATEWAY_Virtual_IP';
$remove_backup_route = False;

if ($type != 'MASTER' && $type != 'BACKUP' && $type != 'INIT') {
    log_error("Carp '$type' event unknown from source '{$subsystem}'");
    exit(1);
}

if (!strstr($subsystem, '@')) {
    log_error("Carp '$type' event triggered from wrong source '{$subsystem}'");
    exit(1);
}

if ($type === "MASTER") {
    if ($config['interfaces']['wan']['enable'] == 0) {
      foreach ($iface_aliases as $ifkey) {
          // $iface_name = $iface_names[$ifkey];
          log_error("enable interface '$ifkey' due CARP event '$type'");
          $config['interfaces'][$ifkey]['enable'] = '1';
          legacy_interface_flags($ifkey, 'up');
          interface_configure(false, $ifkey, true, true);
          write_config("enable interface '$ifkey' due CARP event '$type'", false);
          //usleep(200 * 1000);
          //foreach ($dhcp_ifaces as $dhkey) {
          //  $config['dhcpd'][$dhkey]['enable'] = true;
          //}
      }
    } else {
      log_msg("Carp '$type' duplicate event triggered.");
    }
} else if ($type === "BACKUP") {
    if ($config['interfaces']['wan']['enable'] == 1) {
      foreach ($iface_aliases as $ifkey) {
          // $iface_name = $iface_names[$ifkey];
          log_error("disable interface '$ifkey' due CARP event '$type'");
          //foreach ($dhcp_ifaces as $dhkey) {
          //  $config['dhcpd'][$dhkey]['enable'] = false;
          //}
          interface_reset($ifkey);
          unset($config['interfaces'][$ifkey]['enable']);
          interface_configure(false, $ifkey, true, false);
          exec('/sbin/ifconfig ' . escapeshellarg($ifkey) . 'down 2>&1', $ifc, $ret);
          write_config("disable interface '$ifkey' due CARP event '$type'", false);
          if ($remove_backup_route === True) {
            exec('/sbin/route del default >&1', $ifc, $ret);
            exec('/sbin/route add default ' . $lan_vip . ' >&1', $ifc, $ret);
          }
      }
    } else {
      log_msg("Carp '$type' duplicate event triggered.");
    }
}
?>

I have a slightly new issue and am looking for advice. The script works for failing both ways. What isn't working great is my Spectrum internet. The connection keeps going down because of loss to my monitoring endpoint (i've tried 8.8.8.8, 8.8.4.4, 1.1.1.1, etc). When I set the endpoint to my spectrum gateway, the connection stays stable and rarely drops.

How would I force, upon a new DHCP lease, an update of the gateway monitor IP for the Spectrum gateway? The goal would be to replace the current gateway with the new gateway address (if a new gateway is present).

I haven't found that to be a problem - I'm on spectrum as well. I usually receive the same IP with the same default router.

I will mention that on System: Gateways: Configuration: WAN gateway: Edit, I've checked the Upstream Gateway option (help states This will select the above gateway as a default gateway candidate.) and it's worked well for me.