diff --git a/net/sixlowpan/sixlowpan_framelist.c b/net/sixlowpan/sixlowpan_framelist.c
index 35750b3ce7..62582bed1c 100644
--- a/net/sixlowpan/sixlowpan_framelist.c
+++ b/net/sixlowpan/sixlowpan_framelist.c
@@ -100,8 +100,8 @@
  *   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  *
  * Input Parameters:
- *   ieee - Pointer to IEEE802.15.4 MAC driver structure.
- *   ipv6 - Pointer to the IPv6 header to "compress"
+ *   ieee   - Pointer to IEEE802.15.4 MAC driver structure.
+ *   destip - Pointer to the IPv6 header to "compress"
  *
  * Returned Value:
  *   None
@@ -109,7 +109,7 @@
  ****************************************************************************/
 
 static void sixlowpan_compress_ipv6hdr(FAR struct ieee802154_driver_s *ieee,
-                                       FAR const struct ipv6_hdr_s *ipv6)
+                                       FAR const struct ipv6_hdr_s *destip)
 {
   /* Indicate the IPv6 dispatch and length */
 
@@ -118,7 +118,7 @@ static void sixlowpan_compress_ipv6hdr(FAR struct ieee802154_driver_s *ieee,
 
   /* Copy the IPv6 header and adjust pointers */
 
-  memcpy(g_rimeptr + g_rime_hdrlen, ipv6, IPv6_HDRLEN);
+  memcpy(g_rimeptr + g_rime_hdrlen, destip, IPv6_HDRLEN);
   g_rime_hdrlen   += IPv6_HDRLEN;
   g_uncomp_hdrlen += IPv6_HDRLEN;
 }
@@ -161,12 +161,12 @@ static void sixlowpan_compress_ipv6hdr(FAR struct ieee802154_driver_s *ieee,
 
 int sixlowpan_queue_frames(FAR struct ieee802154_driver_s *ieee,
                            FAR const struct ipv6_hdr_s *destip,
-                           FAR const void *buf,  size_t len,
+                           FAR const void *buf, size_t len,
                            FAR const struct rimeaddr_s *destmac)
 {
   FAR struct iob_s *iob;
   int framer_hdrlen;
-  struct rimeaddr_s dest;
+  struct rimeaddr_s bcastmac;
   uint16_t outlen = 0;
 
   /* Initialize global data.  Locking the network guarantees that we have
@@ -211,13 +211,24 @@ int sixlowpan_queue_frames(FAR struct ieee802154_driver_s *ieee,
 
   if (destmac == NULL)
     {
-      memset(&dest, 0, sizeof(struct rimeaddr_s));
-    }
-  else
-    {
-      rimeaddr_copy(&dest, (FAR const struct rimeaddr_s *)destmac);
+      memset(&bcastmac, 0, sizeof(struct rimeaddr_s));
+      destmac = &bcastmac;
     }
 
+  /* Pre-allocate the IOB to hold frame or the first fragment, waiting if
+   * necessary.
+   */
+
+  iob = iob_alloc(false);
+  DEBUGASSERT(iob != NULL);
+
+  /* Initialize the IOB */
+
+  iob->io_flink  = NULL;
+  iob->io_len    = 0;
+  iob->io_offset = 0;
+  iob->io_pktlen = 0;
+
   ninfo("Sending packet len %d\n", len);
 
 #ifndef CONFIG_NET_6LOWPAN_COMPRESSION_IPv6
@@ -226,9 +237,9 @@ int sixlowpan_queue_frames(FAR struct ieee802154_driver_s *ieee,
       /* Try to compress the headers */
 
 #if defined(CONFIG_NET_6LOWPAN_COMPRESSION_HC1)
-      sixlowpan_compresshdr_hc1(ieee, &dest);
+      sixlowpan_compresshdr_hc1(ieee, destip, destmac, iob);
 #elif defined(CONFIG_NET_6LOWPAN_COMPRESSION_HC06)
-      sixlowpan_compresshdr_hc06(ieee, &dest);
+      sixlowpan_compresshdr_hc06(ieee, destip, destmac, iob);
 #else
 #  error No compression specified
 #endif
@@ -243,7 +254,7 @@ int sixlowpan_queue_frames(FAR struct ieee802154_driver_s *ieee,
 
   ninfo("Header of len %d\n", g_rime_hdrlen);
 
-  rimeaddr_copy(&g_pktaddrs[PACKETBUF_ADDR_RECEIVER], &dest);
+  rimeaddr_copy(&g_pktaddrs[PACKETBUF_ADDR_RECEIVER], destmac);
 
   /* Pre-calculate frame header length. */
 
@@ -279,20 +290,8 @@ int sixlowpan_queue_frames(FAR struct ieee802154_driver_s *ieee,
 
       ninfo("Fragmentation sending packet len %d\n", len);
 
-      /* Allocate an IOB to hold the first fragment, waiting if necessary. */
-
-      iob = iob_alloc(false);
-      DEBUGASSERT(iob != NULL);
-
-      /* Initialize the IOB */
-
-      iob->io_flink  = NULL;
-      iob->io_len    = 0;
-      iob->io_offset = 0;
-      iob->io_pktlen = 0;
-
       /* Create 1st Fragment */
-      /* Add the frame header */
+      /* Add the frame header using the pre-allocated IOB. */
 
       verify = sixlowpan_framecreate(ieee, iob, ieee->i_panid);
       DEBUGASSERT(verify == framer_hdrlen);
@@ -434,19 +433,7 @@ int sixlowpan_queue_frames(FAR struct ieee802154_driver_s *ieee,
        * and send in one frame.
        */
 
-      /* Allocate an IOB to hold the frame, waiting if necessary. */
-
-      iob = iob_alloc(false);
-      DEBUGASSERT(iob != NULL);
-
-      /* Initialize the IOB */
-
-      iob->io_flink  = NULL;
-      iob->io_len    = 0;
-      iob->io_offset = 0;
-      iob->io_pktlen = 0;
-
-      /* Add the frame header */
+      /* Add the frame header to the prealloated IOB. */
 
       verify = sixlowpan_framecreate(ieee, iob, ieee->i_panid);
       DEBUGASSERT(vreify == framer_hdrlen);
diff --git a/net/sixlowpan/sixlowpan_hc06.c b/net/sixlowpan/sixlowpan_hc06.c
index d6668978d9..4293d68c48 100644
--- a/net/sixlowpan/sixlowpan_hc06.c
+++ b/net/sixlowpan/sixlowpan_hc06.c
@@ -203,8 +203,8 @@ void sixlowpan_hc06_initialize(void)
  *
  * Input Parameters:
  *   ieee     - A reference to the IEE802.15.4 network device state
- *   ipv6     - The IPv6 header to be compressed
- *   destaddr - L2 destination address, needed to compress the IP
+ *   destip   - The IPv6 header to be compressed
+ *   destmac  - L2 destination address, needed to compress the IP
  *              destination field
  *   iob      - The IOB into which the compressed header should be saved.
  *
@@ -214,7 +214,9 @@ void sixlowpan_hc06_initialize(void)
  ****************************************************************************/
 
 void sixlowpan_compresshdr_hc06(FAR struct ieee802154_driver_s *ieee,
-                                FAR struct rimeaddr_s *destaddr)
+                                FAR const struct ipv6_hdr_s *destip,
+                                FAR const struct rimeaddr_s *destmac,
+                                FAR struct iob_s *iob)
 {
   /* REVISIT: To be provided */
 }
diff --git a/net/sixlowpan/sixlowpan_hc1.c b/net/sixlowpan/sixlowpan_hc1.c
index 3078896921..c3b5be0899 100644
--- a/net/sixlowpan/sixlowpan_hc1.c
+++ b/net/sixlowpan/sixlowpan_hc1.c
@@ -114,8 +114,8 @@
  *
  * Input Parmeters:
  *   ieee     - A reference to the IEE802.15.4 network device state
- *   ipv6     - The IPv6 header to be compressed
- *   destaddr - L2 destination address, needed to compress the IP
+ *   destip   - The IPv6 header to be compressed
+ *   destmac  - L2 destination address, needed to compress the IP
  *              destination field
  *   iob      - The IOB into which the compressed header should be saved.
  *
@@ -125,21 +125,21 @@
  ****************************************************************************/
 
 void sixlowpan_compresshdr_hc1(FAR struct ieee802154_driver_s *ieee,
-                               FAR const struct ipv6_hdr_s *ipv6,
-                               FAR const struct rimeaddr_s *destaddr,
+                               FAR const struct ipv6_hdr_s *destip,
+                               FAR const struct rimeaddr_s *destmac,
                                FAR struct iob_s *iob)
 {
   FAR uint8_t *hc1 = RIME_HC1_PTR;
 
   /* Check if all the assumptions for full compression are valid */
 
-  if (ipv6->vtc != 0x60 || ipv6->tcflow != 0 || ipv6->flow != 0 ||
-      !sixlowpan_islinklocal(&ipv6->srcipaddr) ||
-      !sixlowpan_ismacbased(&ipv6->srcipaddr, &ieee->i_rimeaddr) ||
-      !sixlowpan_islinklocal(&ipv6->destipaddr) ||
-      !sixlowpan_ismacbased(&ipv6->destipaddr, destaddr) ||
-      (ipv6->proto != IP_PROTO_ICMP6 && ipv6->proto != IP_PROTO_UDP &&
-       ipv6->proto != IP_PROTO_TCP))
+  if (destip->vtc != 0x60 || destip->tcflow != 0 || destip->flow != 0 ||
+      !sixlowpan_islinklocal(&destip->srcipaddr) ||
+      !sixlowpan_ismacbased(&destip->srcipaddr, &ieee->i_rimeaddr) ||
+      !sixlowpan_islinklocal(&destip->destipaddr) ||
+      !sixlowpan_ismacbased(&destip->destipaddr, destmac) ||
+      (destip->proto != IP_PROTO_ICMP6 && destip->proto != IP_PROTO_UDP &&
+       destip->proto != IP_PROTO_TCP))
     {
       /* IPV6 DISPATCH
        * Something cannot be compressed, use IPV6 DISPATCH,
@@ -148,7 +148,7 @@ void sixlowpan_compresshdr_hc1(FAR struct ieee802154_driver_s *ieee,
 
       *g_rimeptr      = SIXLOWPAN_DISPATCH_IPV6;
        g_rime_hdrlen += SIXLOWPAN_IPV6_HDR_LEN;
-       memcpy(g_rimeptr + g_rime_hdrlen, ipv6, IPv6_HDRLEN);
+       memcpy(g_rimeptr + g_rime_hdrlen, destip, IPv6_HDRLEN);
        g_rime_hdrlen += IPv6_HDRLEN;
        g_uncomp_hdrlen += IPv6_HDRLEN;
     }
@@ -161,13 +161,13 @@ void sixlowpan_compresshdr_hc1(FAR struct ieee802154_driver_s *ieee,
 
       hc1[RIME_HC1_DISPATCH] = SIXLOWPAN_DISPATCH_HC1;
       g_uncomp_hdrlen += IPv6_HDRLEN;
-      switch (ipv6->proto)
+      switch (destip->proto)
         {
         case IP_PROTO_ICMP6:
           /* HC1 encoding and ttl */
 
           hc1[RIME_HC1_ENCODING] = 0xfc;
-          hc1[RIME_HC1_TTL] = ipv6->ttl;
+          hc1[RIME_HC1_TTL] = destip->ttl;
           g_rime_hdrlen += SIXLOWPAN_HC1_HDR_LEN;
           break;
 
@@ -176,7 +176,7 @@ void sixlowpan_compresshdr_hc1(FAR struct ieee802154_driver_s *ieee,
           /* HC1 encoding and ttl */
 
           hc1[RIME_HC1_ENCODING] = 0xfe;
-          hc1[RIME_HC1_TTL] = ipv6->ttl;
+          hc1[RIME_HC1_TTL] = destip->ttl;
           g_rime_hdrlen += SIXLOWPAN_HC1_HDR_LEN;
           break;
 #endif /* CONFIG_NET_TCP */
@@ -206,7 +206,7 @@ void sixlowpan_compresshdr_hc1(FAR struct ieee802154_driver_s *ieee,
               /* HC_UDP encoding, ttl, src and dest ports, checksum */
 
               hcudp[RIME_HC1_HC_UDP_UDP_ENCODING] = 0xe0;
-              hcudp[RIME_HC1_HC_UDP_TTL]          = ipv6->ttl;
+              hcudp[RIME_HC1_HC_UDP_TTL]          = destip->ttl;
               hcudp[RIME_HC1_HC_UDP_PORTS]        =
                 (uint8_t)((htons(udp->srcport) - SIXLOWPAN_UDP_PORT_MIN) << 4) +
                 (uint8_t)((htons(udp->destport) - SIXLOWPAN_UDP_PORT_MIN));
@@ -221,7 +221,7 @@ void sixlowpan_compresshdr_hc1(FAR struct ieee802154_driver_s *ieee,
               /* HC1 encoding and ttl */
 
               hc1[RIME_HC1_ENCODING] = 0xfa;
-              hc1[RIME_HC1_TTL]      = ipv6->ttl;
+              hc1[RIME_HC1_TTL]      = destip->ttl;
               g_rime_hdrlen         += SIXLOWPAN_HC1_HDR_LEN;
             }
           break;
@@ -257,24 +257,24 @@ void sixlowpan_compresshdr_hc1(FAR struct ieee802154_driver_s *ieee,
 int sixlowpan_uncompresshdr_hc1(FAR struct ieee802154_driver_s *ieee,
                                 uint16_t iplen)
 {
-  FAR struct ipv6_hdr_s *ipv6 = IPv6BUF(&ieee->i_dev);
+  FAR struct ipv6_hdr_s *destip = IPv6BUF(&ieee->i_dev);
   FAR uint8_t *hc1 = RIME_HC1_PTR;
 
   /* Format the IPv6 header in the device d_buf */
   /* Set version, traffic clase, and flow label */
 
-  ipv6->vtc    = 0x60;  /* Bits 0-3: version, bits 4-7: traffic class (MS) */
-  ipv6->tcf    = 0;     /* Bits 0-3: traffic class (LS), 4-bits: flow label (MS) */
-  ipv6->flow   = 0;     /* 16-bit flow label (LS) */
+  destip->vtc    = 0x60;  /* Bits 0-3: version, bits 4-7: traffic class (MS) */
+  destip->tcf    = 0;     /* Bits 0-3: traffic class (LS), 4-bits: flow label (MS) */
+  destip->flow   = 0;     /* 16-bit flow label (LS) */
 
   /* Use stateless auto-configuration to set source and destination IP
    * addresses.
    */
 
   sixlowpan_ipfromrime(&g_pktaddrs[PACKETBUF_ADDR_SENDER],
-                       &ipv6->srcipaddr);
+                       &destip->srcipaddr);
   sixlowpan_ipfromrime(&g_pktaddrs[PACKETBUF_ADDR_RECEIVER],
-                       &ipv6->destipaddr);
+                       &destip->destipaddr);
   g_uncomp_hdrlen += IPv6_HDRLEN;
 
   /* len[], proto, and ttl depend on the encoding */
@@ -282,15 +282,15 @@ int sixlowpan_uncompresshdr_hc1(FAR struct ieee802154_driver_s *ieee,
   switch (hc1[RIME_HC1_ENCODING] & 0x06)
     {
     case SIXLOWPAN_HC1_NH_ICMP6:
-      ipv6->proto    = IP_PROTO_ICMP6;
-      ipv6->ttl      = hc1[RIME_HC1_TTL];
+      destip->proto    = IP_PROTO_ICMP6;
+      destip->ttl      = hc1[RIME_HC1_TTL];
       g_rime_hdrlen += SIXLOWPAN_HC1_HDR_LEN;
       break;
 
 #if CONFIG_NET_TCP
     case SIXLOWPAN_HC1_NH_TCP:
-      ipv6->proto    = IP_PROTO_TCP;
-      ipv6->ttl      = hc1[RIME_HC1_TTL];
+      destip->proto    = IP_PROTO_TCP;
+      destip->ttl      = hc1[RIME_HC1_TTL];
       g_rime_hdrlen += SIXLOWPAN_HC1_HDR_LEN;
       break;
 #endif /* CONFIG_NET_TCP */
@@ -301,7 +301,7 @@ int sixlowpan_uncompresshdr_hc1(FAR struct ieee802154_driver_s *ieee,
         FAR struct udp_hdr_s *udp = UDPIPv6BUF(&ieee->i_dev);
         FAR uint8_t *hcudp = RIME_HC1_HC_UDP_PTR;
 
-        ipv6->proto = IP_PROTO_UDP;
+        destip->proto = IP_PROTO_UDP;
         if ((hcudp[RIME_HC1_HC_UDP_HC1_ENCODING] & 0x01) != 0)
           {
             /* UDP header is compressed with HC_UDP */
@@ -315,7 +315,7 @@ int sixlowpan_uncompresshdr_hc1(FAR struct ieee802154_driver_s *ieee,
 
             /* IP TTL */
 
-            ipv6->ttl = hcudp[RIME_HC1_HC_UDP_TTL];
+            destip->ttl = hcudp[RIME_HC1_HC_UDP_TTL];
 
             /* UDP ports, len, checksum */
 
@@ -347,25 +347,25 @@ int sixlowpan_uncompresshdr_hc1(FAR struct ieee802154_driver_s *ieee,
     {
       /* This is not a fragmented packet */
 
-      ipv6->len[0] = 0;
-      ipv6->len[1] = ieee->i_dev.d_len - g_rime_hdrlen +  /* REVISIT */
-                     g_uncomp_hdrlen - IPv6_HDRLEN;
+      destip->len[0] = 0;
+      destip->len[1] = ieee->i_dev.d_len - g_rime_hdrlen +  /* REVISIT */
+                       g_uncomp_hdrlen - IPv6_HDRLEN;
     }
   else
     {
       /* This is a 1st fragment */
 
-      ipv6->len[0] = (iplen - IPv6_HDRLEN) >> 8;
-      ipv6->len[1] = (iplen - IPv6_HDRLEN) & 0x00FF;
+      destip->len[0] = (iplen - IPv6_HDRLEN) >> 8;
+      destip->len[1] = (iplen - IPv6_HDRLEN) & 0x00FF;
     }
 
   /* length field in UDP header */
 
 #if CONFIG_NET_UDP
-  if (ipv6->proto == IP_PROTO_UDP)
+  if (destip->proto == IP_PROTO_UDP)
     {
       FAR struct udp_hdr_s *udp = UDPIPv6BUF(&ieee->i_dev);
-      memcpy(&udp->udplen, &ipv6->len[0], 2);
+      memcpy(&udp->udplen, &destip->len[0], 2);
     }
 #endif
 
diff --git a/net/sixlowpan/sixlowpan_internal.h b/net/sixlowpan/sixlowpan_internal.h
index bd8929cbb5..514c5dae6e 100644
--- a/net/sixlowpan/sixlowpan_internal.h
+++ b/net/sixlowpan/sixlowpan_internal.h
@@ -416,7 +416,7 @@ struct iob_s;                /* Forward reference */
  *
  * Input Parameters:
  *   dev     - The IEEE802.15.4 MAC network driver interface.
- *   ipv6    - IPv6 plus TCP or UDP headers.
+ *   destip    - IPv6 plus TCP or UDP headers.
  *   buf     - Data to send
  *   len     - Length of data to send
  *   raddr   - The MAC address of the destination
@@ -434,7 +434,7 @@ struct iob_s;                /* Forward reference */
  ****************************************************************************/
 
 int sixlowpan_send(FAR struct net_driver_s *dev,
-                   FAR const struct ipv6_hdr_s *ipv6, FAR const void *buf,
+                   FAR const struct ipv6_hdr_s *destip, FAR const void *buf,
                    size_t len, FAR const struct rimeaddr_s *raddr,
                    uint16_t timeout);
 
@@ -560,8 +560,8 @@ void sixlowpan_hc06_initialize(void);
  *
  * Input Parameters:
  *   ieee     - A reference to the IEE802.15.4 network device state
- *   ipv6     - The IPv6 header to be compressed
- *   destaddr - L2 destination address, needed to compress the IP
+ *   destip   - The IPv6 header to be compressed
+ *   destmac  - L2 destination address, needed to compress the IP
  *              destination field
  *   iob      - The IOB into which the compressed header should be saved.
  *
@@ -572,8 +572,8 @@ void sixlowpan_hc06_initialize(void);
 
 #ifdef CONFIG_NET_6LOWPAN_COMPRESSION_HC06
 void sixlowpan_compresshdr_hc06(FAR struct ieee802154_driver_s *ieee,
-                                FAR const struct ipv6_hdr_s *ipv6,
-                                FAR const struct rimeaddr_s *destaddr,
+                                FAR const struct ipv6_hdr_s *destip,
+                                FAR const struct rimeaddr_s *destmac,
                                 FAR struct iob_s *iob);
 #endif
 
@@ -618,8 +618,8 @@ void sixlowpan_uncompresshdr_hc06(FAR struct ieee802154_driver_s *ieee,
  *
  * Input Parmeters:
  *   ieee     - A reference to the IEE802.15.4 network device state
- *   ipv6     - The IPv6 header to be compressed
- *   destaddr - L2 destination address, needed to compress the IP
+ *   destip   - The IPv6 header to be compressed
+ *   destmac - L2 destination address, needed to compress the IP
  *              destination field
  *   iob      - The IOB into which the compressed header should be saved.
  *
@@ -630,8 +630,8 @@ void sixlowpan_uncompresshdr_hc06(FAR struct ieee802154_driver_s *ieee,
 
 #ifdef CONFIG_NET_6LOWPAN_COMPRESSION_HC1
 void sixlowpan_compresshdr_hc1(FAR struct ieee802154_driver_s *ieee,
-                               FAR const struct ipv6_hdr_s *ipv6,
-                               FAR const struct rimeaddr_s *destaddr,
+                               FAR const struct ipv6_hdr_s *destip,
+                               FAR const struct rimeaddr_s *destmac,
                                FAR struct iob_s *iob);
 #endif