diff --git a/drivers/wireless/cc3000/cc3000.c b/drivers/wireless/cc3000/cc3000.c
index fdbd4a8aed..1e14d98fdf 100644
--- a/drivers/wireless/cc3000/cc3000.c
+++ b/drivers/wireless/cc3000/cc3000.c
@@ -127,10 +127,6 @@ CCASSERT(sizeof(cc3000_buffer_desc) <= CONFIG_MQ_MAXMSGSIZE);
 #define waitllerr(x,...) // llerr
 #define waitllinfo(x,...) // llinfo
 
-/****************************************************************************
- * Private Types
- ****************************************************************************/
-
 /****************************************************************************
  * Private Function Prototypes
  ****************************************************************************/
diff --git a/net/devif/ipv4_input.c b/net/devif/ipv4_input.c
index 778ff18b74..05f661a39d 100644
--- a/net/devif/ipv4_input.c
+++ b/net/devif/ipv4_input.c
@@ -339,8 +339,8 @@ int ipv4_input(FAR struct net_driver_s *dev)
       g_netstats.ipv4.drop++;
       g_netstats.ipv4.vhlerr++;
 #endif
-      nllerr("ERROR: Invalid IP version or header length: %02x\n",
-             pbuf->vhl);
+      nllwarn("WARNING: Invalid IP version or header length: %02x\n",
+              pbuf->vhl);
       goto drop;
     }
 
@@ -349,7 +349,7 @@ int ipv4_input(FAR struct net_driver_s *dev)
   hdrlen = NET_LL_HDRLEN(dev);
   if ((hdrlen + IPv4_HDRLEN) > dev->d_len)
     {
-      nllerr("ERROR: Packet shorter than IPv4 header\n");
+      nllwarn("WARNING: Packet shorter than IPv4 header\n");
       goto drop;
     }
 
@@ -369,7 +369,7 @@ int ipv4_input(FAR struct net_driver_s *dev)
     }
   else
     {
-      nllerr("ERROR: IP packet shorter than length in IP header\n");
+      nllwarn("WARNING: IP packet shorter than length in IP header\n");
       goto drop;
     }
 
@@ -388,7 +388,7 @@ int ipv4_input(FAR struct net_driver_s *dev)
       g_netstats.ipv4.drop++;
       g_netstats.ipv4.fragerr++;
 #endif
-      nllerr("ERROR: IP fragment dropped\n");
+      nllwarn("WARNING: IP fragment dropped\n");
       goto drop;
 #endif /* CONFIG_NET_TCP_REASSEMBLY */
     }
@@ -414,7 +414,7 @@ int ipv4_input(FAR struct net_driver_s *dev)
 #ifdef CONFIG_NET_ICMP
   if (net_ipv4addr_cmp(dev->d_ipaddr, INADDR_ANY))
     {
-      nllerr("ERROR: No IP address assigned\n");
+      nllwarn("WARNING: No IP address assigned\n");
       goto drop;
     }
 
@@ -447,7 +447,7 @@ int ipv4_input(FAR struct net_driver_s *dev)
       g_netstats.ipv4.drop++;
       g_netstats.ipv4.chkerr++;
 #endif
-      nllerr("ERROR: Bad IP checksum\n");
+      nllwarn("WARNING: Bad IP checksum\n");
       goto drop;
     }
 
@@ -495,7 +495,7 @@ int ipv4_input(FAR struct net_driver_s *dev)
         g_netstats.ipv4.protoerr++;
 #endif
 
-        nllerr("ERROR: Unrecognized IP protocol\n");
+        nllwarn("WARNING: Unrecognized IP protocol\n");
         goto drop;
     }
 
diff --git a/net/devif/ipv6_input.c b/net/devif/ipv6_input.c
index 547193825d..e3e7ba46f2 100644
--- a/net/devif/ipv6_input.c
+++ b/net/devif/ipv6_input.c
@@ -151,7 +151,7 @@ int ipv6_input(FAR struct net_driver_s *dev)
       g_netstats.ipv6.vhlerr++;
 #endif
 
-      nllerr("ERROR: Invalid IPv6 version: %d\n", ipv6->vtc >> 4);
+      nllwarn("WARNING: Invalid IPv6 version: %d\n", ipv6->vtc >> 4);
       goto drop;
     }
 
@@ -160,7 +160,7 @@ int ipv6_input(FAR struct net_driver_s *dev)
   hdrlen = NET_LL_HDRLEN(dev);
   if ((hdrlen + IPv6_HDRLEN) > dev->d_len)
     {
-      nllerr("ERROR: Packet shorter than IPv6 header\n");
+      nllwarn("WARNING: Packet shorter than IPv6 header\n");
       goto drop;
     }
 
@@ -187,7 +187,7 @@ int ipv6_input(FAR struct net_driver_s *dev)
     }
   else
     {
-      nllerr("ERROR: IP packet shorter than length in IP header\n");
+      nllwarn("WARNING: IP packet shorter than length in IP header\n");
       goto drop;
     }
 
@@ -216,7 +216,7 @@ int ipv6_input(FAR struct net_driver_s *dev)
        * packets.
        */
 
-      nllerr("ERROR: No IP address assigned\n");
+      nllwarn("WARNING: No IP address assigned\n");
       goto drop;
     }
 
@@ -279,7 +279,7 @@ int ipv6_input(FAR struct net_driver_s *dev)
         g_netstats.ipv6.protoerr++;
 #endif
 
-        nllerr("ERROR: Unrecognized IP protocol: %04x\n", ipv6->proto);
+        nllwarn("WARNING: Unrecognized IP protocol: %04x\n", ipv6->proto);
         goto drop;
     }
 
diff --git a/net/icmp/icmp_input.c b/net/icmp/icmp_input.c
index 368795e1ef..a065848270 100644
--- a/net/icmp/icmp_input.c
+++ b/net/icmp/icmp_input.c
@@ -164,7 +164,7 @@ void icmp_input(FAR struct net_driver_s *dev)
 
   else
     {
-      nllerr("ERROR: Unknown ICMP cmd: %d\n", picmp->type);
+      nllwarn("WARNING: Unknown ICMP cmd: %d\n", picmp->type);
       goto typeerr;
     }
 
diff --git a/net/icmpv6/icmpv6_input.c b/net/icmpv6/icmpv6_input.c
index cf65480a12..31de97b332 100644
--- a/net/icmpv6/icmpv6_input.c
+++ b/net/icmpv6/icmpv6_input.c
@@ -307,7 +307,7 @@ void icmpv6_input(FAR struct net_driver_s *dev)
 
     default:
       {
-        nllerr("ERROR: Unknown ICMPv6 type: %d\n", icmp->type);
+        nllwarn("WARNING: Unknown ICMPv6 type: %d\n", icmp->type);
         goto icmpv6_type_error;
       }
     }
diff --git a/net/icmpv6/icmpv6_neighbor.c b/net/icmpv6/icmpv6_neighbor.c
index 0f0dd9076a..0b4d9d13ce 100644
--- a/net/icmpv6/icmpv6_neighbor.c
+++ b/net/icmpv6/icmpv6_neighbor.c
@@ -298,7 +298,7 @@ int icmpv6_neighbor(const net_ipv6addr_t ipaddr)
   state.snd_cb = icmpv6_callback_alloc(dev);
   if (!state.snd_cb)
     {
-      nerr("ERROR: Failed to allocate a cllback\n");
+      nerr("ERROR: Failed to allocate a callback\n");
       ret = -ENOMEM;
       goto errout_with_lock;
     }
diff --git a/net/igmp/igmp_input.c b/net/igmp/igmp_input.c
index 7d3daa14f4..01d645715c 100644
--- a/net/igmp/igmp_input.c
+++ b/net/igmp/igmp_input.c
@@ -124,7 +124,7 @@ void igmp_input(struct net_driver_s *dev)
   if (dev->d_len < NET_LL_HDRLEN(dev) + IPIGMP_HDRLEN)
     {
       IGMP_STATINCR(g_netstats.igmp.length_errors);
-      nllerr("ERROR: Length error\n");
+      nllwarn("WARNING: Length error\n");
       return;
     }
 
@@ -133,7 +133,7 @@ void igmp_input(struct net_driver_s *dev)
   if (net_chksum((FAR uint16_t *)&IGMPBUF->type, IGMP_HDRLEN) != 0)
     {
       IGMP_STATINCR(g_netstats.igmp.chksum_errors);
-      nllerr("ERROR: Checksum error\n");
+      nllwarn("WARNING: Checksum error\n");
       return;
     }
 
@@ -192,7 +192,7 @@ void igmp_input(struct net_driver_s *dev)
                     IGMP_STATINCR(g_netstats.igmp.v1_received);
                     IGMPBUF->maxresp = 10;
 
-                    nllerr("ERROR: V1 not implemented\n");
+                    nllwarn("WARNING: V1 not implemented\n");
                   }
 
                 IGMP_STATINCR(g_netstats.igmp.query_received);
@@ -270,7 +270,7 @@ void igmp_input(struct net_driver_s *dev)
 
       default:
         {
-          nllerr("ERROR: Unexpected msg %02x\n", IGMPBUF->type);
+          nllwarn("WARNING: Unexpected msg %02x\n", IGMPBUF->type);
         }
       break;
     }
diff --git a/net/tcp/tcp_input.c b/net/tcp/tcp_input.c
index 757efe9cfc..277db67412 100644
--- a/net/tcp/tcp_input.c
+++ b/net/tcp/tcp_input.c
@@ -126,7 +126,7 @@ static void tcp_input(FAR struct net_driver_s *dev, unsigned int iplen)
       g_netstats.tcp.drop++;
       g_netstats.tcp.chkerr++;
 #endif
-      nllerr("ERROR: Bad TCP checksum\n");
+      nllwarn("WARNING: Bad TCP checksum\n");
       goto drop;
     }
 
@@ -398,7 +398,7 @@ found:
 
           if ((conn->tcpstateflags & TCP_STATE_MASK) == TCP_ESTABLISHED)
             {
-              nllerr("ERROR: conn->sndseq %d, conn->unacked %d\n",
+              nllwarn("WARNING: conn->sndseq %d, conn->unacked %d\n",
                      tcp_getsequence(conn->sndseq), conn->unacked);
               goto reset;
             }
diff --git a/net/tcp/tcp_send_buffered.c b/net/tcp/tcp_send_buffered.c
index fb67556ae6..a343d0d046 100644
--- a/net/tcp/tcp_send_buffered.c
+++ b/net/tcp/tcp_send_buffered.c
@@ -566,7 +566,7 @@ static uint16_t psock_send_interrupt(FAR struct net_driver_s *dev,
 
           if (++WRB_NRTX(wrb) >= TCP_MAXRTX)
             {
-              nllerr("ERROR: Expiring wrb=%p nrtx=%u\n",
+              nllwarn("WARNING: Expiring wrb=%p nrtx=%u\n",
                      wrb, WRB_NRTX(wrb));
 
               /* The maximum retry count as been exhausted. Remove the write
@@ -632,7 +632,7 @@ static uint16_t psock_send_interrupt(FAR struct net_driver_s *dev,
 
           if (++WRB_NRTX(wrb) >= TCP_MAXRTX)
             {
-              nllerr("ERROR: Expiring wrb=%p nrtx=%u\n",
+              nllwarn("WARNING: Expiring wrb=%p nrtx=%u\n",
                      wrb, WRB_NRTX(wrb));
 
               /* Return the write buffer to the free list */
diff --git a/net/tcp/tcp_send_unbuffered.c b/net/tcp/tcp_send_unbuffered.c
index 5e6ebec474..0e7e9fe7c4 100644
--- a/net/tcp/tcp_send_unbuffered.c
+++ b/net/tcp/tcp_send_unbuffered.c
@@ -570,7 +570,7 @@ static uint16_t tcpsend_interrupt(FAR struct net_driver_s *dev,
     {
       /* Yes.. report the timeout */
 
-      nllerr("ERROR: SEND timeout\n");
+      nllwarn("WARNING: SEND timeout\n");
       pstate->snd_sent = -ETIMEDOUT;
       goto end_wait;
     }
diff --git a/net/udp/udp_input.c b/net/udp/udp_input.c
index 2c380a4028..9047cf02ca 100644
--- a/net/udp/udp_input.c
+++ b/net/udp/udp_input.c
@@ -149,7 +149,7 @@ static int udp_input(FAR struct net_driver_s *dev, unsigned int iplen)
       g_netstats.udp.drop++;
       g_netstats.udp.chkerr++;
 #endif
-      nllerr("ERROR: Bad UDP checksum\n");
+      nllwarn("WARNING: Bad UDP checksum\n");
       dev->d_len = 0;
     }
   else
@@ -207,7 +207,7 @@ static int udp_input(FAR struct net_driver_s *dev, unsigned int iplen)
         }
       else
         {
-          nllerr("ERROR: No listener on UDP port\n");
+          nllwarn("WARNING: No listener on UDP port\n");
           dev->d_len = 0;
         }
     }
diff --git a/net/udp/udp_psock_sendto.c b/net/udp/udp_psock_sendto.c
index 9486851822..b962dadbfd 100644
--- a/net/udp/udp_psock_sendto.c
+++ b/net/udp/udp_psock_sendto.c
@@ -235,7 +235,7 @@ static uint16_t sendto_interrupt(FAR struct net_driver_s *dev, FAR void *conn,
         {
           /* Terminate the transfer with an error. */
 
-          nllerr("ERROR: Network is down\n");
+          nllwarn("WARNING: Network is down\n");
           pstate->st_sndlen = -ENETUNREACH;
         }
 
@@ -257,7 +257,7 @@ static uint16_t sendto_interrupt(FAR struct net_driver_s *dev, FAR void *conn,
             {
               /* Yes.. report the timeout */
 
-              nllerr("ERROR: SEND timeout\n");
+              nllwarn("WARNING: SEND timeout\n");
               pstate->st_sndlen = -ETIMEDOUT;
             }
           else