diff --git a/usr.sbin/ndp/ndp.c b/usr.sbin/ndp/ndp.c
--- a/usr.sbin/ndp/ndp.c
+++ b/usr.sbin/ndp/ndp.c
@@ -453,10 +453,7 @@
 		sdl_m.sdl_alen = 6;
 	while (argc-- > 0) {
 		if (strncmp(argv[0], "temp", 4) == 0) {
-			struct timeval now;
-
-			gettimeofday(&now, 0);
-			opts.expire_time = now.tv_sec + 20 * 60;
+			opts.expire_time = 20 * 60;
 		} else if (strncmp(argv[0], "proxy", 5) == 0)
 			opts.flags |= RTF_ANNOUNCE;
 		argv++;
@@ -957,7 +954,11 @@
 	case RTM_ADD:
 		rtm->rtm_addrs |= RTA_GATEWAY;
 		if (opts.expire_time) {
-			rtm->rtm_rmx.rmx_expire = opts.expire_time;
+			struct timespec uptime;
+			clock_gettime(CLOCK_UPTIME_FAST, &uptime);
+
+			/* XXX: kernel expects uptime here */
+			rtm->rtm_rmx.rmx_expire = uptime.tv_sec + opts.expire_time;
 			rtm->rtm_inits = RTV_EXPIRE;
 		}
 		rtm->rtm_flags |= (RTF_HOST | RTF_STATIC | RTF_LLDATA);
diff --git a/usr.sbin/ndp/ndp_netlink.c b/usr.sbin/ndp/ndp_netlink.c
--- a/usr.sbin/ndp/ndp_netlink.c
+++ b/usr.sbin/ndp/ndp_netlink.c
@@ -481,11 +481,16 @@
 	hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_REPLACE;
 	struct ndmsg *ndmsg = snl_reserve_msg_object(&nw, struct ndmsg);
 	if (ndmsg != NULL) {
-		uint8_t nl_flags = NTF_STICKY;
+		uint8_t nl_flags = 0;
 
 		ndmsg->ndm_family = AF_INET6;
 		ndmsg->ndm_ifindex = ifindex;
-		ndmsg->ndm_state = NUD_PERMANENT;
+		if (opts.expire_time == 0) {
+			nl_flags |= NTF_STICKY;
+			ndmsg->ndm_state = NUD_PERMANENT;
+		} else {
+			ndmsg->ndm_state = NUD_NONE;
+		}
 
 		if (opts.flags & RTF_ANNOUNCE)
 			nl_flags |= NTF_PROXY;
@@ -494,6 +499,15 @@
 	snl_add_msg_attr_ip(&nw, NDA_DST, (struct sockaddr *)dst);
 	snl_add_msg_attr(&nw, NDA_LLADDR, sdl->sdl_alen, LLADDR(sdl));
 
+	if (opts.expire_time > 0) {
+		struct timeval now;
+
+		gettimeofday(&now, 0);
+		int off = snl_add_msg_attr_nested(&nw, NDA_FREEBSD);
+		snl_add_msg_attr_u32(&nw, NDAF_NEXT_STATE_TS, now.tv_sec + opts.expire_time);
+		snl_end_attr_nested(&nw, off);
+	}
+
 	if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(&ss, hdr)) {
 		snl_free(&ss);
 		return (1);