--- zzzz-none-000/linux-4.1.52/net/ipv6/ndisc.c	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/net/ipv6/ndisc.c	2022-03-02 11:37:13.000000000 +0000
@@ -982,8 +982,12 @@
 		return;
 	}
 
+#if defined(CONFIG_BCM_KF_IP)
+	if (!idev->cnf.forwarding  || (idev->dev->priv_flags & IFF_WANDEV))
+#else
 	/* Don't accept RS if we're not in router mode */
 	if (!idev->cnf.forwarding)
+#endif
 		goto out;
 
 	/*