--- zzzz-none-000/linux-5.4.213/net/ipv6/ndisc.c	2022-09-15 10:04:56.000000000 +0000
+++ alder-5690pro-762/linux-5.4.213/net/ipv6/ndisc.c	2024-08-14 09:02:13.000000000 +0000
@@ -648,6 +648,7 @@
 
 	ndisc_send_skb(skb, daddr, saddr);
 }
+EXPORT_SYMBOL(ndisc_send_ns);
 
 void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr,
 		   const struct in6_addr *daddr)