diff --git a/components/dfs/include/dfs_poll.h b/components/dfs/include/dfs_poll.h
index 066363d6fc9d99523a61ceca825d0d9ae9be24a9..d9597a4364a45fd44748e735ea551139e8af8b53 100644
--- a/components/dfs/include/dfs_poll.h
+++ b/components/dfs/include/dfs_poll.h
@@ -29,8 +29,6 @@
 #define POLLHUP         (0x08)
 #define POLLNVAL        (0x10)
 
-#define POLLMASK_DEFAULT (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)
-
 typedef unsigned int nfds_t;
 
 struct pollfd
@@ -39,12 +37,10 @@ struct pollfd
     short events;
     short revents;
 };
+#endif /* !defined(POLLIN) && !defined(POLLOUT) */
 
-int poll(struct pollfd *fds, nfds_t nfds, int timeout);
-#else /* !defined(POLLIN) && !defined(POLLOUT) */
 #define POLLMASK_DEFAULT (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)
 int poll(struct pollfd *fds, nfds_t nfds, int timeout);
-#endif /* !defined(POLLIN) && !defined(POLLOUT) */
 #endif /* RT_USING_POSIX */
 
 #endif /* DFS_POLL_H__ */
diff --git a/components/net/Kconfig b/components/net/Kconfig
index 8f3b87f05525826042df137e8c2bf79852fe364e..c302dec152749c34eaa6b042a4e78a690822998b 100644
--- a/components/net/Kconfig
+++ b/components/net/Kconfig
@@ -73,7 +73,7 @@ config RT_USING_LWIP
                 bool "lwIP v2.1.0"
         endchoice
 
-        if (RT_USING_LWIP210)
+        if (RT_USING_LWIP210 || RT_USING_LWIP202)
             config RT_USING_LWIP_IPV6
                 bool "IPV6 protocol"
                 default n
diff --git a/components/net/sal_socket/impl/af_inet_lwip.c b/components/net/sal_socket/impl/af_inet_lwip.c
index b1e04373c6f544901c8f9e0bb96d3ce8eece775d..df356f89d0110fcebe96ea931e27530cc064cb07 100644
--- a/components/net/sal_socket/impl/af_inet_lwip.c
+++ b/components/net/sal_socket/impl/af_inet_lwip.c
@@ -271,8 +271,8 @@ static const struct proto_ops lwip_inet_stream_ops = {
     lwip_listen,
     lwip_connect,
     inet_accept,
-    lwip_sendto,
-    lwip_recvfrom,
+    (int (*)(int, const void *, size_t, int, const struct sockaddr *, socklen_t))lwip_sendto,
+    (int (*)(int, void *, size_t, int, struct sockaddr *, socklen_t *))lwip_recvfrom,
     lwip_getsockopt,
     //TODO fix on 1.4.1
     lwip_setsockopt,
diff --git a/components/net/sal_socket/include/sal.h b/components/net/sal_socket/include/sal.h
index ba5589c7343c9eddef083afcd3fd4173ae26cc3a..68248742d6822c9911af38a6bd8732eb6a02ceb5 100644
--- a/components/net/sal_socket/include/sal.h
+++ b/components/net/sal_socket/include/sal.h
@@ -51,13 +51,8 @@ struct proto_ops
     int (*listen)     (int s, int backlog);
     int (*connect)    (int s, const struct sockaddr *name, socklen_t namelen);
     int (*accept)     (int s, struct sockaddr *addr, socklen_t *addrlen);
-#if LWIP_VERSION >= 0x20100ff
-    ssize_t (*sendto)     (int s, const void *data, size_t size, int flags, const struct sockaddr *to, socklen_t tolen);
-    ssize_t (*recvfrom)   (int s, void *mem, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen);
-#else
     int (*sendto)     (int s, const void *data, size_t size, int flags, const struct sockaddr *to, socklen_t tolen);
     int (*recvfrom)   (int s, void *mem, size_t len, int flags, struct sockaddr *from, socklen_t *fromlen);
-#endif
     int (*getsockopt) (int s, int level, int optname, void *optval, socklen_t *optlen);
     int (*setsockopt) (int s, int level, int optname, const void *optval, socklen_t optlen);
     int (*shutdown)   (int s, int how);