Remove CONFIG_NET_PINGADDRCONF. This was a uIP way of assigning IP addresses, but is not standard and not a appropriate feature in general.

net/icmp/Kconfig

@@ -18,15 +18,14 @@ if NET_ICMP
 config NET_ICMP_PING
 	bool "ICMP ping interfaces"
 	default n
+	depends on BUILD_FLAT
 	---help---
 		Provide interfaces to support application level support for
 		for sending ECHO (ping) requests and associating ECHO replies.
 
-config NET_PINGADDRCONF
-	bool "Ping address configuration"
-	default n
-	---help---
-		Use "ping" packet for setting IP address
+		NOTE: Calling these interfaces from application space is a
+		violation of the OS/application interface but for historical
+		reasons, is permitted in the flat build.
 
 endif # NET_ICMP
 endmenu # ICMP Networking Support

net/icmp/icmp_input.c

@@ -117,18 +117,6 @@ void icmp_input(FAR struct net_driver_s *dev)
 
   if (picmp->type == ICMP_ECHO_REQUEST)
     {
-      /* If we are configured to use ping IP address assignment, we use
-       * the destination IP address of this ping packet and assign it to
-       * ourself.
-       */
-
-#ifdef CONFIG_NET_PINGADDRCONF
-      if (dev->d_ipaddr == 0)
-        {
-          dev->d_ipaddr = picmp->destipaddr;
-        }
-#endif
-
       /* Change the ICMP type */
 
       picmp->type = ICMP_ECHO_REPLY;