diff --git a/include/net.h b/include/net.h
index 455b48f6c7..7e5f5a6a5b 100644
--- a/include/net.h
+++ b/include/net.h
@@ -15,17 +15,26 @@
 #include <asm/cache.h>
 #include <asm/byteorder.h>	/* for nton* / ntoh* stuff */
 
-#define DEBUG_LL_STATE 0	/* Link local state machine changes */
-#define DEBUG_DEV_PKT 0		/* Packets or info directed to the device */
-#define DEBUG_NET_PKT 0		/* Packets on info on the network at large */
+#define DEBUG_LL_STATE  0	/* Link local state machine changes */
+#define DEBUG_DEV_PKT   0	/* Packets or info directed to the device */
+#define DEBUG_NET_PKT   0	/* Packets on info on the network at large */
 #define DEBUG_INT_STATE 0	/* Internal network state changes */
 
 /*
  *	The number of receive packet buffers, and the required packet buffer
  *	alignment in memory.
  *
+ *	The number of buffers for TCP is used to calculate a static TCP window
+ *	size, becuse TCP window size is a promise to the sending TCP to be able
+ *	to buffer up to the window size of data.
+ *	When the sending TCP has a window size of outstanding unacknowledged
+ *	data, the sending TCP will stop sending.
  */
 
+#if defined(CONFIG_TCP)
+#define CONFIG_SYS_RX_ETH_BUFFER 12	/* For TCP */
+#endif
+
 #ifdef CONFIG_SYS_RX_ETH_BUFFER
 # define PKTBUFSRX	CONFIG_SYS_RX_ETH_BUFFER
 #else
@@ -354,6 +363,7 @@ struct vlan_ethernet_hdr {
 
 #define IPPROTO_ICMP	 1	/* Internet Control Message Protocol	*/
 #define IPPROTO_UDP	17	/* User Datagram Protocol		*/
+#define IPPROTO_TCP	 6	/* Transmission Control Protocol        */
 
 /*
  *	Internet Protocol (IP) header.
@@ -596,10 +606,10 @@ int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot);
 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot);
 
 /* Set IP header */
-void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source);
+void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source,
+		       u16  pkt_len, u8 prot);
 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport,
-				int sport, int len);
-
+			int sport, int len);
 /**
  * compute_ip_checksum() - Compute IP checksum
  *
@@ -670,6 +680,9 @@ static inline void net_send_packet(uchar *pkt, int len)
  * @param sport Source UDP port
  * @param payload_len Length of data after the UDP header
  */
+int net_send_ip_packet(uchar *ether, struct in_addr dest, int dport, int sport,
+		       int payload_len, int proto);
+
 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport,
 			int sport, int payload_len);
 
diff --git a/net/net.c b/net/net.c
index 4259c9e321..df4e7317e7 100644
--- a/net/net.c
+++ b/net/net.c
@@ -181,6 +181,7 @@ int		net_ntp_time_offset;
 static uchar net_pkt_buf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
 /* Receive packets */
 uchar *net_rx_packets[PKTBUFSRX];
+
 /* Current UDP RX packet handler */
 static rxhand_f *udp_packet_handler;
 /* Current ARP RX packet handler */
@@ -777,11 +778,23 @@ void net_set_timeout_handler(ulong iv, thand_f *f)
 }
 
 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
-		int payload_len)
+			int payload_len)
+{
+	return net_send_ip_packet(ether, dest, dport, sport, payload_len,
+				  IPPROTO_UDP);
+}
+
+int net_send_ip_packet(uchar *ether, struct in_addr dest, int dport, int sport,
+		       int payload_len, int proto)
 {
 	uchar *pkt;
 	int eth_hdr_size;
 	int pkt_hdr_size;
+	if (proto == IPPROTO_UDP) {
+		debug_cond(DEBUG_DEV_PKT,
+			   "UDP Send  (to=%pI4, from=%pI4, len=%d)\n",
+			   &dest, &net_ip, payload_len);
+	}
 
 	/* make sure the net_tx_packet is initialized (net_init() was called) */
 	assert(net_tx_packet != NULL);
@@ -799,9 +812,15 @@ int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
 	pkt = (uchar *)net_tx_packet;
 
 	eth_hdr_size = net_set_ether(pkt, ether, PROT_IP);
-	pkt += eth_hdr_size;
-	net_set_udp_header(pkt, dest, dport, sport, payload_len);
-	pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
+	switch (proto) {
+	case IPPROTO_UDP:
+		net_set_udp_header(pkt + eth_hdr_size, dest,
+				   dport, sport, payload_len);
+		pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
+	break;
+	default:
+		return -1;
+	}
 
 	/* if MAC address was not discovered yet, do an ARP request */
 	if (memcmp(ether, net_null_ethaddr, 6) == 0) {
@@ -1157,9 +1176,6 @@ void net_process_received_packet(uchar *in_packet, int len)
 		/* Can't deal with anything except IPv4 */
 		if ((ip->ip_hl_v & 0xf0) != 0x40)
 			return;
-		/* Can't deal with IP options (headers != 20 bytes) */
-		if ((ip->ip_hl_v & 0x0f) > 0x05)
-			return;
 		/* Check the Checksum of the header */
 		if (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) {
 			debug("checksum bad\n");
@@ -1205,6 +1221,7 @@ void net_process_received_packet(uchar *in_packet, int len)
 		 * we send a tftp packet to a dead connection, or when
 		 * there is no server at the other end.
 		 */
+
 		if (ip->ip_p == IPPROTO_ICMP) {
 			receive_icmp(ip, len, src_ip, et);
 			return;
@@ -1365,8 +1382,7 @@ common:
 }
 /**********************************************************************/
 
-int
-net_eth_hdr_size(void)
+int net_eth_hdr_size(void)
 {
 	ushort myvlanid;
 
@@ -1426,25 +1442,28 @@ int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
 	}
 }
 
-void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source)
+void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source,
+		       u16  pkt_len, u8 prot)
 {
 	struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
 
 	/*
-	 *	Construct an IP header.
+	 *      Construct an IP header.
 	 */
 	/* IP_HDR_SIZE / 4 (not including UDP) */
 	ip->ip_hl_v  = 0x45;
 	ip->ip_tos   = 0;
-	ip->ip_len   = htons(IP_HDR_SIZE);
+	ip->ip_len   = htons(pkt_len);
 	ip->ip_id    = htons(net_ip_id++);
-	ip->ip_off   = htons(IP_FLAGS_DFRAG);	/* Don't fragment */
+	ip->ip_off   = htons(IP_FLAGS_DFRAG);   /* Don't fragment */
 	ip->ip_ttl   = 255;
+	ip->ip_p     = prot;
 	ip->ip_sum   = 0;
 	/* already in network byte order */
 	net_copy_ip((void *)&ip->ip_src, &source);
 	/* already in network byte order */
 	net_copy_ip((void *)&ip->ip_dst, &dest);
+	ip->ip_sum  = compute_ip_checksum(ip, IP_HDR_SIZE);
 }
 
 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport,
@@ -1460,11 +1479,8 @@ void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport, int sport,
 	if (len & 1)
 		pkt[IP_UDP_HDR_SIZE + len] = 0;
 
-	net_set_ip_header(pkt, dest, net_ip);
-	ip->ip_len   = htons(IP_UDP_HDR_SIZE + len);
-	ip->ip_p     = IPPROTO_UDP;
-	ip->ip_sum   = compute_ip_checksum(ip, IP_HDR_SIZE);
-
+	net_set_ip_header(pkt, dest, net_ip, IP_UDP_HDR_SIZE + len,
+			  IPPROTO_UDP);
 	ip->udp_src  = htons(sport);
 	ip->udp_dst  = htons(dport);
 	ip->udp_len  = htons(UDP_HDR_SIZE + len);
diff --git a/net/ping.c b/net/ping.c
index 9508cf1160..254b646193 100644
--- a/net/ping.c
+++ b/net/ping.c
@@ -20,16 +20,11 @@ struct in_addr net_ping_ip;
 static void set_icmp_header(uchar *pkt, struct in_addr dest)
 {
 	/*
-	 *	Construct an IP and ICMP header.
+	 *	Construct an ICMP header.
 	 */
-	struct ip_hdr *ip = (struct ip_hdr *)pkt;
 	struct icmp_hdr *icmp = (struct icmp_hdr *)(pkt + IP_HDR_SIZE);
 
-	net_set_ip_header(pkt, dest, net_ip);
-
-	ip->ip_len   = htons(IP_ICMP_HDR_SIZE);
-	ip->ip_p     = IPPROTO_ICMP;
-	ip->ip_sum   = compute_ip_checksum(ip, IP_HDR_SIZE);
+	net_set_ip_header(pkt, dest, net_ip, IP_ICMP_HDR_SIZE, IPPROTO_ICMP);
 
 	icmp->type = ICMP_ECHO_REQUEST;
 	icmp->code = 0;
