diff --git a/src/vnet/ip/ip4.h b/src/vnet/ip/ip4.h
index 339b84b..a7e05a4 100644
--- a/src/vnet/ip/ip4.h
+++ b/src/vnet/ip/ip4.h
@@ -230,7 +230,7 @@
 /* Find interface address which matches destination. */
 always_inline ip4_address_t *
 ip4_interface_address_matching_destination (ip4_main_t * im,
-					    ip4_address_t * dst,
+					    const ip4_address_t * dst,
 					    u32 sw_if_index,
 					    ip_interface_address_t **
 					    result_ia)
@@ -271,12 +271,6 @@
 
 int ip4_address_compare (ip4_address_t * a1, ip4_address_t * a2);
 
-/* Send an ARP request to see if given destination is reachable on given interface. */
-clib_error_t *ip4_probe_neighbor (vlib_main_t * vm, ip4_address_t * dst,
-				  u32 sw_if_index, u8 refresh);
-
-clib_error_t *ip4_set_arp_limit (u32 arp_limit);
-
 uword
 ip4_udp_register_listener (vlib_main_t * vm,
 			   u16 dst_port, u32 next_node_index);