--- interfaces.inc.orig	2023-08-15 10:07:01.006137000 +0800
+++ interfaces.inc	2023-08-15 10:38:14.251255000 +0800
@@ -3054,9 +3054,14 @@
 		$carpvip = get_configured_vip($vip['interface']);
 		$iface = $carpvip['interface'];
 		$vhid = "vhid {$carpvip['vhid']}";
+		if ($af == 'inet') {
+			$mode = ($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) {