diff --git a/lwip/src/arch/sys_arch.c b/lwip/src/arch/sys_arch.c
index 88b9e26b..5b90bf66 100644
--- a/lwip/src/arch/sys_arch.c
+++ b/lwip/src/arch/sys_arch.c
@@ -167,7 +167,7 @@ u32_t sys_arch_mbox_fetch(sys_mbox_t * mbox, void **msg, u32_t timeout)
 	int err;
 
 	err = mailbox_ptr_fetch(&mbox->mailbox, msg, timeout);
-	LWIP_DEBUGF(SYS_DEBUG, ("sys_arch_mbox_fetch: %d\n", err));
+	//LWIP_DEBUGF(SYS_DEBUG, ("sys_arch_mbox_fetch: %d\n", err));
 	if (!err)
 		return 0;
 
@@ -216,7 +216,7 @@ err_t sys_mbox_trypost(sys_mbox_t *mbox, void *msg)
 	int err;
 
 	err = mailbox_ptr_trypost(&mbox->mailbox, msg);
-	LWIP_DEBUGF(SYS_DEBUG, ("sys_mbox_trypost: %d"\n, err));
+	//LWIP_DEBUGF(SYS_DEBUG, ("sys_mbox_trypost: %d"\n, err));
 
 	return err;
 }
diff --git a/lwip/src/include/arch/cc.h b/lwip/src/include/arch/cc.h
index 392132bb..f34c3e51 100644
--- a/lwip/src/include/arch/cc.h
+++ b/lwip/src/include/arch/cc.h
@@ -70,7 +70,7 @@ typedef size_t mem_ptr_t;
 #define MEM_ALIGNMENT 4
 #define ETH_PAD_SIZE  2
 
-#define LWIP_CHKSUM_ALGORITHM	3
+#define LWIP_CHKSUM_ALGORITHM	2
 
 /* prototypes for printf() and abort() */
 #include <metalsvm/stdio.h>
diff --git a/lwip/src/include/lwipopts.h b/lwip/src/include/lwipopts.h
index 34d12975..d21fe32c 100644
--- a/lwip/src/include/lwipopts.h
+++ b/lwip/src/include/lwipopts.h
@@ -179,7 +179,7 @@
  */
 #define MEMP_NUM_TCP_SEG		TCP_SND_QUEUELEN
 
-// On the SCC, we have not to check incoming messages
+// On the SCC, we have not to check incoming messages from the trusted MCPC
 #ifdef CONFIG_ROCKCREEK
 /**
  * CHECKSUM_CHECK_IP==1: Check checksums in software for incoming IP packets.
@@ -202,12 +202,12 @@
 #define DHCP_DEBUG		LWIP_DBG_OFF
 #define ETHARP_DEBUG		LWIP_DBG_OFF
 #define TCPIP_DEBUG		LWIP_DBG_OFF
-#define SYS_DEBUG		LWIP_DBG_OFF
+#define SYS_DEBUG		LWIP_DBG_ON
 #define RAW_DEBUG		LWIP_DBG_OFF
 #define MEM_DEBUG		LWIP_DBG_OFF
 #define IP_DEBUG		LWIP_DBG_OFF
 #define INET_DEBUG		LWIP_DBG_OFF
-#define NETIF_DEBUG		LWIP_DBG_OFF
+#define NETIF_DEBUG		LWIP_DBG_ON
 #define TIMERS_DEBUG		LWIP_DBG_OFF
 #define SOCKETS_DEBUG		LWIP_DBG_OFF
 #define PBUF_DEBUG		LWIP_DBG_OFF