diff --git a/include/nuttx/net/ipv6ext.h b/include/nuttx/net/ipv6ext.h
index 4905b2b8418..b1359f33244 100644
--- a/include/nuttx/net/ipv6ext.h
+++ b/include/nuttx/net/ipv6ext.h
@@ -164,6 +164,7 @@ struct ipv6_extension_s
 {
   uint8_t  nxthdr;      /* Next header */
   uint8_t  len;         /* Extension header length */
+  uint8_t  pad[6];      /* Pad to a multiple of 8 bytes */
 };
 
 /* Hop-by-hop Option Header */
@@ -220,6 +221,7 @@ struct ipv6_router_alert_s
   uint8_t type;       /* Hop-by-hop option number (5) */
   uint8_t len;        /* Length = 2 */
   uint16_t value;     /* Value.  See OPT_RA_* Definitions */
+  uint8_t pad[4];     /* Pad to a multiple of 8 bytes */
 };
 
 #endif /* __INCLUDE_NUTTX_NET_IPV6EXT_H */
diff --git a/net/igmp/igmp_poll.c b/net/igmp/igmp_poll.c
index fe34a6b82b8..f3f4e1872b1 100644
--- a/net/igmp/igmp_poll.c
+++ b/net/igmp/igmp_poll.c
@@ -141,8 +141,6 @@ void igmp_poll(FAR struct net_driver_s *dev)
 {
   FAR struct igmp_group_s *group;
 
-  ninfo("Entry\n");
-
   /* Setup the poll operation */
 
   dev->d_appdata = &dev->d_buf[NET_LL_HDRLEN(dev) + IPIGMP_HDRLEN];
diff --git a/net/mld/mld_join.c b/net/mld/mld_join.c
index 337f43e4993..3f414bb978d 100644
--- a/net/mld/mld_join.c
+++ b/net/mld/mld_join.c
@@ -113,7 +113,7 @@ int mld_joingroup(FAR const struct ipv6_mreq *mrec)
         mrec->ipv6mr_multiaddr.s6_addr16[4],
         mrec->ipv6mr_multiaddr.s6_addr16[5],
         mrec->ipv6mr_multiaddr.s6_addr16[5],
-        mrec->ipv6mr_multiaddr.s6_addr16[7);
+        mrec->ipv6mr_multiaddr.s6_addr16[7]);
 
   /* Check if a this address is already in the group */
 
diff --git a/net/mld/mld_leave.c b/net/mld/mld_leave.c
index a2818efa977..6115d0d9988 100644
--- a/net/mld/mld_leave.c
+++ b/net/mld/mld_leave.c
@@ -113,7 +113,7 @@ int mld_leavegroup(FAR const struct ipv6_mreq *mrec)
         mrec->ipv6mr_multiaddr.s6_addr16[4],
         mrec->ipv6mr_multiaddr.s6_addr16[5],
         mrec->ipv6mr_multiaddr.s6_addr16[5],
-        mrec->ipv6mr_multiaddr.s6_addr16[7);
+        mrec->ipv6mr_multiaddr.s6_addr16[7]);
 
   /* Find the entry corresponding to the address leaving the group */
 
diff --git a/net/mld/mld_mcastmac.c b/net/mld/mld_mcastmac.c
index 782538309ea..e01d9c85e8a 100644
--- a/net/mld/mld_mcastmac.c
+++ b/net/mld/mld_mcastmac.c
@@ -70,7 +70,6 @@ static void mld_mcastmac(FAR const net_ipv6addr_t ipaddr, FAR uint8_t *mac)
   ninfo("Mcast IP: %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
         ipaddr[0], ipaddr[1], ipaddr[2], ipaddr[3],
         ipaddr[4], ipaddr[5], ipaddr[6], ipaddr[7]);
-  ninfo("IP: 0")
 
   /* For the MAC address by insert the low 32 Bits of the multicast IPv6
    * Address into the Ethernet Address .  This mapping is from the IETF
diff --git a/net/mld/mld_poll.c b/net/mld/mld_poll.c
index cd038f7a36c..fedd873de8f 100644
--- a/net/mld/mld_poll.c
+++ b/net/mld/mld_poll.c
@@ -95,8 +95,6 @@ void mld_poll(FAR struct net_driver_s *dev)
 {
   FAR struct mld_group_s *group;
 
-  ninfo("Entry\n");
-
   /* Setup the poll operation */
 
   dev->d_appdata = &dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN];
diff --git a/net/mld/mld_send.c b/net/mld/mld_send.c
index 3975acd7f79..3cb7ef6b883 100644
--- a/net/mld/mld_send.c
+++ b/net/mld/mld_send.c
@@ -78,16 +78,16 @@
 
 #define IPv6BUF     ((FAR struct ipv6_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev)])
 #define RABUF       ((FAR struct ipv6_router_alert_s *) \
-                     &dev->d_buf[NET_LL_HDRLEN(dev)] + IPv6_HDRLEN)
+                     (&dev->d_buf[NET_LL_HDRLEN(dev)] + IPv6_HDRLEN))
 #define RASIZE      sizeof(struct ipv6_router_alert_s)
 #define QUERYBUF    ((FAR struct mld_mcast_listen_query_s *) \
-                     &dev->d_buf[NET_LL_HDRLEN(dev)] + IPv6_HDRLEN + RASIZE)
+                     (&dev->d_buf[NET_LL_HDRLEN(dev)] + IPv6_HDRLEN + RASIZE))
 #define V1REPORTBUF ((FAR struct mld_mcast_listen_report_v1_s *) \
-                     &dev->d_buf[NET_LL_HDRLEN(dev)] + IPv6_HDRLEN + RASIZE)
+                     (&dev->d_buf[NET_LL_HDRLEN(dev)] + IPv6_HDRLEN + RASIZE))
 #define V2REPORTBUF ((FAR struct mld_mcast_listen_report_v2_s *) \
-                     &dev->d_buf[NET_LL_HDRLEN(dev)] + IPv6_HDRLEN + RASIZE)
+                     (&dev->d_buf[NET_LL_HDRLEN(dev)] + IPv6_HDRLEN + RASIZE))
 #define DONEBUF     ((FAR struct mld_mcast_listen_done_v1_s *) \
-                     &dev->d_buf[NET_LL_HDRLEN(dev)] + IPv6_HDRLEN + RASIZE)
+                     (&dev->d_buf[NET_LL_HDRLEN(dev)] + IPv6_HDRLEN + RASIZE))
 
 /****************************************************************************
  * Public Functions
@@ -224,6 +224,9 @@ void mld_send(FAR struct net_driver_s *dev, FAR struct mld_group_s *group,
       case MLD_SEND_V1DONE:             /* Send MLDv1 Done message */
         destipaddr = g_ipv6_allrouters;
         break;
+
+      default:                          /* Can't happen, but eliminates a warning */
+        return;
     }
 
   ninfo("destipaddr: %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
@@ -243,7 +246,6 @@ void mld_send(FAR struct net_driver_s *dev, FAR struct mld_group_s *group,
   ra->hbyh.nxthdr = IP_PROTO_ICMP6;          /* ICMPv6 payload follows extension header */
   ra->hbyh.len    = 1;                       /* One 8-octet option follows */
   ra->type        = HOPBYHOP_ROUTER_ALERT;   /* Router alert */
-  ra->len         = 2;                       /* Length */
 
   /* Format the MLD ICMPv6 payload into place after the IPv6 header (with
    * router alert)
@@ -348,6 +350,9 @@ void mld_send(FAR struct net_driver_s *dev, FAR struct mld_group_s *group,
           MLD_STATINCR(g_netstats.mld.done_sent);
         }
         break;
+
+      default:                          /* Can't happen, but eliminates a warning */
+        return;
     }
 
   MLD_STATINCR(g_netstats.icmpv6.sent);