-void send_ip4_garp (vlib_main_t * vm, u32 sw_if_index);
-void send_ip4_garp_w_addr (vlib_main_t * vm,
- const ip4_address_t * ip4_addr, u32 sw_if_index);
+extern u8 *format_ethernet_arp_header (u8 * s, va_list * va);
+extern u8 *format_ethernet_arp_opcode (u8 * s, va_list * va);
+extern u8 *format_ethernet_arp_hardware_type (u8 * s, va_list * va);