set LWIP_RAW to 0 because we don't nee raw pcbs => speeds up input processing

kernel/ping.c

@@ -52,6 +52,7 @@
 #include <lwip/sys.h>
 #include <lwip/timers.h>
 #include <lwip/inet_chksum.h>
+#include <lwip/ip.h>
 
 #if LWIP_SOCKET
 #define PING_USE_SOCKETS	1

lwip/src/include/lwipopts.h

@@ -9,6 +9,12 @@
  */
 #define NO_SYS			0
 
+/**
+ * LWIP_RAW==1: Enable application layer to hook into the IP layer itself.
+ * LWIP_RAW==0: speeds up input processing
+ */
+#define LWIP_RAW		0
+
 /**
  * LWIP_SOCKET==1: Enable Socket API (require to use sockets.c)
  */