Index: arp.c
===================================================================
RCS file: /cvs/src/usr.sbin/arp/arp.c,v
retrieving revision 1.80
diff -u -p -r1.80 arp.c
--- arp.c	23 Dec 2017 20:53:07 -0000	1.80
+++ arp.c	1 Mar 2018 22:40:12 -0000
@@ -490,6 +490,17 @@ search(in_addr_t addr, void (*action)(st
 			continue;
 		sin = (struct sockaddr_inarp *)(next + rtm->rtm_hdrlen);
 		sdl = (struct sockaddr_dl *)(sin + 1);
+		if (sdl->sdl_family != AF_LINK)
+			continue;
+		switch (sdl->sdl_type) {
+		case IFT_ETHER:
+		case IFT_CARP:
+		case IFT_XETHER:
+			break;
+		default:
+			continue;
+		}
+
 		if (addr) {
 			if (addr != sin->sin_addr.s_addr)
 				continue;