--- /etc/inc/interfaces.inc.orig	2023-07-18 12:41:19.190233000 +0800
+++ /etc/inc/interfaces.inc	2023-07-18 13:00:23.373239000 +0800
@@ -3050,13 +3050,19 @@
 	}
 	$iface = $vip['interface'];
 	$vhid = '';
+	$mode = '';
 	if (substr($vip['interface'], 0, 4) == "_vip") {
 		$carpvip = get_configured_vip($vip['interface']);
 		$iface = $carpvip['interface'];
 		$vhid = "vhid {$carpvip['vhid']}";
+	        if (is_ipaddrv4($carpvip['subnet'])) {
+	        	$mode = ($carpvip['carp_mode'] == 'ucast' ? "peer ". escapeshellarg($carpvip['carp_peer']) : " mcast");
+	        } else {
+	        	$mode = ($carpvip['carp_mode'] == 'ucast' ? "peer6 ". escapeshellarg($carpvip['carp_peer']) : " mcast6");
+	        }
 	}
-	mwexec("/sbin/ifconfig " . escapeshellarg($realif) ." {$af} ". escapeshellarg($vip['subnet']) ."/" . escapeshellarg($vip['subnet_bits']) . " alias {$gateway} {$vhid}");
-	unset($iface, $af, $realif, $carpvip, $vhid, $gateway);
+	mwexec("/sbin/ifconfig " . escapeshellarg($realif) ." {$af} ". escapeshellarg($vip['subnet']) ."/" . escapeshellarg($vip['subnet_bits']) . " alias {$gateway} {$vhid} {$mode}");
+	unset($iface, $af, $realif, $carpvip, $vhid, $gateway, $mode);
 }
 
 function interface_carp_configure(&$vip, $ipalias_reload = false) {