diff --git a/include/nuttx/net/ip.h b/include/nuttx/net/ip.h
index 5e573f2d67..c401e6a0d0 100644
--- a/include/nuttx/net/ip.h
+++ b/include/nuttx/net/ip.h
@@ -90,7 +90,7 @@
  * Public Type Definitions
  ****************************************************************************/
 
-/* Representation of an IP address */
+/* Representation of an IP address in the IPv6 domains */
 
 typedef uint16_t net_ipv6addr_t[8];
 
@@ -100,6 +100,52 @@ typedef net_ipv6addr_t net_ipaddr_t;
 typedef in_addr_t net_ipaddr_t;
 #endif
 
+/* Describes and address in either the IPv4 or IPv6 domain */
+
+union ip_addr_u
+{
+#ifdef CONFIG_NET_IPv4
+  /* IPv4 address */
+
+  in_addr_t ipv4;
+#endif
+
+#ifdef CONFIG_NET_IPv6
+  /* IPv6 addresse */
+
+  net_ipv6addr_t ipv6;
+#endif
+};
+
+/* Describes address binding for a PF_INET or PF_INET6 socket */
+
+union ip_binding_u
+{
+#ifdef CONFIG_NET_IPv4
+  /* IPv4 addresses (for PF_INET socket) */
+
+  struct
+  {
+#ifdef CONFIG_NETDEV_MULTINIC
+    in_addr_t laddr;      /* The bound local IPv4 address */
+#endif
+    in_addr_t raddr;      /* The IPv4 address of the remote host */
+  } ipv4;
+#endif /* CONFIG_NET_IPv4 */
+
+#ifdef CONFIG_NET_IPv6
+  /* IPv6 addresses (for PF_INET6 socket) */
+
+  struct
+  {
+#ifdef CONFIG_NETDEV_MULTINIC
+    net_ipv6addr_t laddr; /* The bound local IPv6 address */
+#endif
+    net_ipv6addr_t raddr; /* The IPv6 address of the remote host */
+  } ipv6;
+#endif /* CONFIG_NET_IPv6 */
+};
+
 #ifdef CONFIG_NET_IPv4
 /* The IPv4 header */
 
diff --git a/net/devif/ipv6_input.c b/net/devif/ipv6_input.c
index f98ef48a90..43a14a946d 100644
--- a/net/devif/ipv6_input.c
+++ b/net/devif/ipv6_input.c
@@ -209,7 +209,7 @@ int ipv6_input(FAR struct net_driver_s *dev)
   else
 #endif
 #ifdef CONFIG_NET_ICMPv6
-  if (net_ipv6addr_cmp(dev->d_ipaddr, g_allzeroaddr))
+  if (net_ipv6addr_cmp(dev->d_ipv6addr, g_allzeroaddr))
     {
       /* If we are configured to use ping IP address configuration and
        * hasn't been assigned an IP address yet, we accept all ICMP
@@ -233,7 +233,7 @@ int ipv6_input(FAR struct net_driver_s *dev)
        * multicast packets that are sent to the ff02::/16 addresses.
        */
 
-      if (!net_ipv6addr_cmp(pbuf->destipaddr, dev->d_ipaddr) &&
+      if (!net_ipv6addr_cmp(pbuf->destipaddr, dev->d_ipv6addr) &&
           pbuf->destipaddr[0] != 0xff02)
         {
 #ifdef CONFIG_NET_STATISTICS
diff --git a/net/netdev/netdev_findbyaddr.c b/net/netdev/netdev_findbyaddr.c
index 570b84a0c8..8dd48d3806 100644
--- a/net/netdev/netdev_findbyaddr.c
+++ b/net/netdev/netdev_findbyaddr.c
@@ -160,7 +160,7 @@ netdev_finddevice_ipv6addr(const net_ipv6addr_t ripaddr)
         {
           /* Yes.. check for an address match (under the netmask) */
 
-          if (net_ipaddr_maskcmp(dev->d_ipv6ipaddr, ripaddr, dev->d_ipv6netmask))
+          if (net_ipaddr_maskcmp(dev->d_ipv6addr, ripaddr, dev->d_ipv6netmask))
             {
               /* Its a match */
 
diff --git a/net/socket/accept.c b/net/socket/accept.c
index 19da42e276..ddc5b23ed5 100644
--- a/net/socket/accept.c
+++ b/net/socket/accept.c
@@ -112,7 +112,7 @@ static inline void accept_tcpsender(FAR struct tcp_conn_s *conn,
     {
       addr->sin_family = AF_INET6;
       addr->sin_port   = conn->rport;
-      net_ipaddr_copy(addr->sin6_addr.s6_addr, conn->ripaddr);
+      net_ipaddr_copy(addr->sin6_addr.s6_addr, conn->u.ipv4.raddr);
     }
 }
 #else
@@ -123,7 +123,7 @@ static inline void accept_tcpsender(FAR struct tcp_conn_s *conn,
     {
       addr->sin_family = AF_INET;
       addr->sin_port   = conn->rport;
-      net_ipaddr_copy(addr->sin_addr.s_addr, conn->ripaddr);
+      net_ipaddr_copy(addr->sin_addr.s_addr, conn->u.ipv4.raddr);
     }
 }
 #endif /* CONFIG_NET_IPv6 */
diff --git a/net/socket/getsockname.c b/net/socket/getsockname.c
index 04b96b01b8..423e1147b4 100644
--- a/net/socket/getsockname.c
+++ b/net/socket/getsockname.c
@@ -121,8 +121,8 @@ int ipv4_getsockname(FAR struct socket *psock, FAR struct sockaddr *addr,
           FAR struct tcp_conn_s *tcp_conn = (FAR struct tcp_conn_s *)psock->s_conn;
           outaddr->sin_port = tcp_conn->lport; /* Already in network byte order */
 #ifdef CONFIG_NETDEV_MULTINIC
-          lipaddr = tcp_conn->lipaddr;
-          ripaddr = tcp_conn->ripaddr;
+          lipaddr = tcp_conn->u.ipv4.laddr;
+          ripaddr = tcp_conn->u.ipv4.raddr;
 #endif
         }
         break;
@@ -134,8 +134,8 @@ int ipv4_getsockname(FAR struct socket *psock, FAR struct sockaddr *addr,
           FAR struct udp_conn_s *udp_conn = (FAR struct udp_conn_s *)psock->s_conn;
           outaddr->sin_port = udp_conn->lport; /* Already in network byte order */
 #ifdef CONFIG_NETDEV_MULTINIC
-          lipaddr = udp_conn->lipaddr;
-          ripaddr = udp_conn->ripaddr;
+          lipaddr = udp_conn->u.ipv4.laddr;
+          ripaddr = udp_conn->u.ipv4.raddr;
 #endif
         }
         break;
@@ -244,8 +244,8 @@ int ipv6_getsockname(FAR struct socket *psock, FAR struct sockaddr *addr,
           FAR struct tcp_conn_s *tcp_conn = (FAR struct tcp_conn_s *)psock->s_conn;
           outaddr->sin_port = tcp_conn->lport; /* Already in network byte order */
 #ifdef CONFIG_NETDEV_MULTINIC
-          lipaddr = tcp_conn->lipaddr;
-          ripaddr = tcp_conn->ripaddr;
+          lipaddr = &tcp_conn->u.ipv6.laddr;
+          ripaddr = &tcp_conn->u.ipv6.raddr;
 #endif
         }
         break;
@@ -257,16 +257,15 @@ int ipv6_getsockname(FAR struct socket *psock, FAR struct sockaddr *addr,
           FAR struct udp_conn_s *udp_conn = (FAR struct udp_conn_s *)psock->s_conn;
           outaddr->sin_port = udp_conn->lport; /* Already in network byte order */
 #ifdef CONFIG_NETDEV_MULTINIC
-          lipaddr = &udp_conn->lipaddr;
-          ripaddr = &udp_conn->ripaddr;
+          lipaddr = &udp_conn->u.ipv6.laddr;
+          ripaddr = &udp_conn->u.ipv6.raddr;
 #endif
         }
         break;
 #endif
 
       default:
-        err = EOPNOTSUPP;
-        goto errout;
+        return -EOPNOTSUPP;
     }
 
   /* The socket/connection does not know its IP address unless
@@ -296,7 +295,7 @@ int ipv6_getsockname(FAR struct socket *psock, FAR struct sockaddr *addr,
 
 #if defined(CONFIG_NET_TCP) || defined(CONFIG_NET_UDP)
   outaddr->sin_family = AF_INET6;
-  memcpy(outaddr->sin6_addr.in6_u.u6_addr8, dev->d_ipaddr, 16);
+  memcpy(outaddr->sin6_addr.in6_u.u6_addr8, dev->d_ipv6addr, 16);
   *addrlen = sizeof(struct sockaddr_in6);
 #endif
   netdev_semgive();
diff --git a/net/socket/net_close.c b/net/socket/net_close.c
index 428f6590f2..a66fe8ff12 100644
--- a/net/socket/net_close.c
+++ b/net/socket/net_close.c
@@ -358,9 +358,9 @@ static inline int netclose_disconnect(FAR struct socket *psock)
       /* Notify the device driver of the availability of TX data */
 
 #ifdef CONFIG_NET_MULTILINK
-      netdev_txnotify(conn->lipaddr, conn->ripaddr);
+      netdev_txnotify(conn->u.ipv4.laddr, conn->u.ipv4.raddr);
 #else
-      netdev_txnotify(conn->ripaddr);
+      netdev_txnotify(conn->u.ipv4.raddr);
 #endif
 
 #ifdef CONFIG_NET_SOLINGER
diff --git a/net/socket/net_sendfile.c b/net/socket/net_sendfile.c
index 4e99f596e3..5ec1ead075 100644
--- a/net/socket/net_sendfile.c
+++ b/net/socket/net_sendfile.c
@@ -330,7 +330,7 @@ static uint16_t sendfile_interrupt(FAR struct net_driver_s *dev, FAR void *pvcon
 
 #if defined(CONFIG_NET_ETHERNET) && !defined(CONFIG_NET_ARP_IPIN) && \
     !defined(CONFIG_NET_ARP_SEND)
-          if (pstate->snd_sent != 0 || arp_find(conn->ripaddr) != NULL)
+          if (pstate->snd_sent != 0 || arp_find(conn->u.ipv4.raddr) != NULL)
 #endif
             {
               /* Update the amount of data sent (but not necessarily ACKed) */
@@ -484,7 +484,7 @@ ssize_t net_sendfile(int outfd, struct file *infile, off_t *offset,
   /* Make sure that the IP address mapping is in the ARP table */
 
 #ifdef CONFIG_NET_ARP_SEND
-  ret = arp_send(conn->ripaddr);
+  ret = arp_send(conn->u.ipv4.raddr);
   if (ret < 0)
     {
       ndbg("ERROR: Not reachable\n");
@@ -565,9 +565,9 @@ ssize_t net_sendfile(int outfd, struct file *infile, off_t *offset,
       /* Notify the device driver of the availability of TX data */
 
 #ifdef CONFIG_NET_MULTILINK
-      netdev_txnotify(conn->lipaddr, conn->ripaddr);
+      netdev_txnotify(conn->u.ipv4.laddr, conn->u.ipv4.raddr);
 #else
-      netdev_txnotify(conn->ripaddr);
+      netdev_txnotify(conn->u.ipv4.raddr);
 #endif
       net_lockedwait(&state.snd_sem);
     }
diff --git a/net/socket/recvfrom.c b/net/socket/recvfrom.c
index a16f23c2b2..88d8e455e1 100644
--- a/net/socket/recvfrom.c
+++ b/net/socket/recvfrom.c
@@ -1097,9 +1097,9 @@ static ssize_t pkt_recvfrom(FAR struct socket *psock, FAR void *buf, size_t len,
 
 #if 0 /* No */
 #ifdef CONFIG_NET_MULTILINK
-      netdev_rxnotify(conn->lipaddr, conn->ripaddr);
+      netdev_rxnotify(conn->u.ipv4.laddr, conn->u.ipv4.raddr);
 #else
-      netdev_rxnotify(conn->ripaddr);
+      netdev_rxnotify(conn->u.ipv4.raddr);
 #endif
 #endif
 
@@ -1196,9 +1196,9 @@ static ssize_t udp_recvfrom(FAR struct socket *psock, FAR void *buf, size_t len,
       /* Notify the device driver of the receive call */
 
 #ifdef CONFIG_NET_MULTILINK
-      netdev_rxnotify(conn->lipaddr, conn->ripaddr);
+      netdev_rxnotify(conn->u.ipv4.laddr, conn->u.ipv4.raddr);
 #else
-      netdev_rxnotify(conn->ripaddr);
+      netdev_rxnotify(conn->u.ipv4.raddr);
 #endif
 
       /* Wait for either the receive to complete or for an error/timeout to occur.
diff --git a/net/socket/sendto.c b/net/socket/sendto.c
index ae2884816f..1514875559 100644
--- a/net/socket/sendto.c
+++ b/net/socket/sendto.c
@@ -420,9 +420,9 @@ ssize_t psock_sendto(FAR struct socket *psock, FAR const void *buf,
       /* Notify the device driver of the availability of TX data */
 
 #ifdef CONFIG_NET_MULTILINK
-      netdev_txnotify(conn->lipaddr, conn->ripaddr);
+      netdev_txnotify(conn->u.ipv4.laddr, conn->u.ipv4.raddr);
 #else
-      netdev_txnotify(conn->ripaddr);
+      netdev_txnotify(conn->u.ipv4.raddr);
 #endif
 
       /* Wait for either the receive to complete or for an error/timeout to occur.
diff --git a/net/tcp/tcp.h b/net/tcp/tcp.h
index 863c227cc5..8f8e857348 100644
--- a/net/tcp/tcp.h
+++ b/net/tcp/tcp.h
@@ -90,7 +90,6 @@
 /****************************************************************************
  * Public Type Definitions
  ****************************************************************************/
-
 /* Representation of a TCP connection.
  *
  * The tcp_conn_s structure is used for identifying a connection. All
@@ -108,10 +107,7 @@ struct tcp_hdr_s;         /* Forward reference */
 struct tcp_conn_s
 {
   dq_entry_t node;        /* Implements a doubly linked list */
-#ifdef CONFIG_NETDEV_MULTINIC
-  net_ipaddr_t lipaddr;   /* The bound local IP address */
-#endif
-  net_ipaddr_t ripaddr;   /* The IP address of the remote host */
+  union ip_binding_u u;   /* IP address binding */
   uint8_t  rcvseq[4];     /* The sequence number that we expect to
                            * receive next */
   uint8_t  sndseq[4];     /* The sequence number that was last sent by us */
diff --git a/net/tcp/tcp_conn.c b/net/tcp/tcp_conn.c
index f5f46a829f..1ce526560c 100644
--- a/net/tcp/tcp_conn.c
+++ b/net/tcp/tcp_conn.c
@@ -132,11 +132,11 @@ static FAR struct tcp_conn_s *tcp_listener(uint16_t portno)
            * with INADDR_ANY.
            */
 
-          if (net_ipaddr_cmp(conn->lipaddr, ipaddr) ||
+          if (net_ipaddr_cmp(conn->u.ipv4.laddr, ipaddr) ||
 #ifdef CONFIG_NET_IPv6
-              net_ipaddr_cmp(conn->lipaddr, g_allzeroaddr))
+              net_ipaddr_cmp(conn->u.ipv4.laddr, g_allzeroaddr))
 #else
-              net_ipaddr_cmp(conn->lipaddr, INADDR_ANY))
+              net_ipaddr_cmp(conn->u.ipv4.laddr, INADDR_ANY))
 #endif
 #endif
             {
@@ -525,10 +525,10 @@ FAR struct tcp_conn_s *tcp_active(FAR struct net_driver_s *dev,
           tcp->destport == conn->lport &&
           tcp->srcport  == conn->rport &&
 #ifdef CONFIG_NETDEV_MULTINIC
-          (net_ipaddr_cmp(conn->lipaddr, g_allzeroaddr) ||
-           net_ipaddr_cmp(destipaddr, conn->lipaddr)) &&
+          (net_ipaddr_cmp(conn->u.ipv4.laddr, g_allzeroaddr) ||
+           net_ipaddr_cmp(destipaddr, conn->u.ipv4.laddr)) &&
 #endif
-          net_ipaddr_cmp(srcipaddr, conn->ripaddr))
+          net_ipaddr_cmp(srcipaddr, conn->u.ipv4.raddr))
         {
           /* Matching connection found.. break out of the loop and return a
            * reference to it.
@@ -601,9 +601,9 @@ FAR struct tcp_conn_s *tcp_alloc_accept(FAR struct net_driver_s *dev,
       conn->lport         = tcp->destport;
       conn->rport         = tcp->srcport;
       conn->mss           = TCP_INITIAL_MSS(dev);
-      net_ipaddr_copy(conn->ripaddr, net_ip4addr_conv32(ip->srcipaddr));
+      net_ipaddr_copy(conn->u.ipv4.raddr, net_ip4addr_conv32(ip->srcipaddr));
 #ifdef CONFIG_NETDEV_MULTINIC
-      net_ipaddr_copy(conn->lipaddr, net_ip4addr_conv32(ip->destipaddr));
+      net_ipaddr_copy(conn->u.ipv4.laddr, net_ip4addr_conv32(ip->destipaddr));
 #endif
       conn->tcpstateflags = TCP_SYN_RCVD;
 
@@ -707,7 +707,7 @@ int tcp_bind(FAR struct tcp_conn_s *conn,
   conn->lport = addr->sin_port;
 
 #ifdef CONFIG_NETDEV_MULTINIC
-  net_ipaddr_copy(conn->lipaddr, ipaddr);
+  net_ipaddr_copy(conn->u.ipv4.laddr, ipaddr);
 #endif
 
   return OK;
@@ -761,7 +761,7 @@ int tcp_connect(FAR struct tcp_conn_s *conn,
 
   flags = net_lock();
 #ifdef CONFIG_NETDEV_MULTINIC
-  port = tcp_selectport(conn->lipaddr, ntohs(conn->lport));
+  port = tcp_selectport(conn->u.ipv4.laddr, ntohs(conn->lport));
 #else
   port = tcp_selectport(ntohs(conn->lport));
 #endif
@@ -801,7 +801,7 @@ int tcp_connect(FAR struct tcp_conn_s *conn,
 
   /* The sockaddr address is 32-bits in network order. */
 
-  net_ipaddr_copy(conn->ripaddr, addr->sin_addr.s_addr);
+  net_ipaddr_copy(conn->u.ipv4.raddr, addr->sin_addr.s_addr);
 
 #ifdef CONFIG_NET_TCP_READAHEAD
   /* Initialize the list of TCP read-ahead buffers */
diff --git a/net/tcp/tcp_send.c b/net/tcp/tcp_send.c
index bc488b51e2..7fbb0e045b 100644
--- a/net/tcp/tcp_send.c
+++ b/net/tcp/tcp_send.c
@@ -188,7 +188,7 @@ static void tcp_sendcommon(FAR struct net_driver_s *dev,
   pbuf->destport = conn->rport;
 
   net_ipaddr_hdrcopy(pbuf->srcipaddr, &dev->d_ipaddr);
-  net_ipaddr_hdrcopy(pbuf->destipaddr, &conn->ripaddr);
+  net_ipaddr_hdrcopy(pbuf->destipaddr, &conn->u.ipv4.raddr);
 
   if (conn->tcpstateflags & TCP_STOPPED)
     {
diff --git a/net/tcp/tcp_send_buffered.c b/net/tcp/tcp_send_buffered.c
index ed0632ccdc..66a9831909 100644
--- a/net/tcp/tcp_send_buffered.c
+++ b/net/tcp/tcp_send_buffered.c
@@ -552,7 +552,7 @@ static uint16_t psock_send_interrupt(FAR struct net_driver_s *dev,
 
 #if defined(CONFIG_NET_ETHERNET) && !defined(CONFIG_NET_ARP_IPIN) && \
     !defined(CONFIG_NET_ARP_SEND)
-      if (arp_find(conn->ripaddr) != NULL)
+      if (arp_find(conn->u.ipv4.raddr) != NULL)
 #endif
         {
           FAR struct tcp_wrbuffer_s *wrb;
@@ -754,7 +754,7 @@ ssize_t psock_tcp_send(FAR struct socket *psock, FAR const void *buf,
 
   conn = (FAR struct tcp_conn_s *)psock->s_conn;
 #ifdef CONFIG_NET_ARP_SEND
-  ret = arp_send(conn->ripaddr);
+  ret = arp_send(conn->u.ipv4.raddr);
   if (ret < 0)
     {
       ndbg("ERROR: Not reachable\n");
@@ -829,9 +829,9 @@ ssize_t psock_tcp_send(FAR struct socket *psock, FAR const void *buf,
               /* Notify the device driver of the availability of TX data */
 
 #ifdef CONFIG_NET_MULTILINK
-              netdev_txnotify(conn->lipaddr, conn->ripaddr);
+              netdev_txnotify(conn->u.ipv4.laddr, conn->u.ipv4.raddr);
 #else
-              netdev_txnotify(conn->ripaddr);
+              netdev_txnotify(conn->u.ipv4.raddr);
 #endif
               result = len;
             }
diff --git a/net/tcp/tcp_send_unbuffered.c b/net/tcp/tcp_send_unbuffered.c
index 9aa6cdb5a0..90380640b2 100644
--- a/net/tcp/tcp_send_unbuffered.c
+++ b/net/tcp/tcp_send_unbuffered.c
@@ -397,7 +397,7 @@ static uint16_t tcpsend_interrupt(FAR struct net_driver_s *dev,
 
 #if defined(CONFIG_NET_ETHERNET) && !defined(CONFIG_NET_ARP_IPIN) && \
     !defined(CONFIG_NET_ARP_SEND)
-         if (pstate->snd_sent != 0 || arp_find(conn->ripaddr) != NULL)
+         if (pstate->snd_sent != 0 || arp_find(conn->u.ipv4.raddr) != NULL)
 #endif
             {
               /* Update the amount of data sent (but not necessarily ACKed) */
@@ -538,7 +538,7 @@ ssize_t psock_tcp_send(FAR struct socket *psock,
 
   conn = (FAR struct tcp_conn_s *)psock->s_conn;
 #ifdef CONFIG_NET_ARP_SEND
-  ret = arp_send(conn->ripaddr);
+  ret = arp_send(conn->u.ipv4.raddr);
   if (ret < 0)
     {
       ndbg("ERROR: Not reachable\n");
@@ -591,15 +591,15 @@ ssize_t psock_tcp_send(FAR struct socket *psock,
 
           state.snd_cb->flags   = (TCP_ACKDATA | TCP_REXMIT | TCP_POLL |
                                    TCP_CLOSE | TCP_ABORT | TCP_TIMEDOUT);
-          state.snd_cb->priv    = (void*)&state;
+          state.snd_cb->priv    = (FAR void *)&state;
           state.snd_cb->event   = tcpsend_interrupt;
 
           /* Notify the device driver of the availability of TX data */
 
 #ifdef CONFIG_NET_MULTILINK
-          netdev_txnotify(conn->lipaddr, conn->ripaddr);
+          netdev_txnotify(conn->u.ipv4.laddr, conn->u.ipv4.raddr);
 #else
-          netdev_txnotify(conn->ripaddr);
+          netdev_txnotify(conn->u.ipv4.raddr);
 #endif
 
           /* Wait for the send to complete or an error to occur:  NOTES: (1)
diff --git a/net/udp/udp.h b/net/udp/udp.h
index 758f89a966..fd60b7ca8e 100644
--- a/net/udp/udp.h
+++ b/net/udp/udp.h
@@ -67,10 +67,7 @@ struct udp_hdr_s;         /* Forward reference */
 struct udp_conn_s
 {
   dq_entry_t node;        /* Supports a doubly linked list */
-#ifdef CONFIG_NETDEV_MULTINIC
-  net_ipaddr_t lipaddr;   /* Bound local IP address (network byte order) */
-#endif
-  net_ipaddr_t ripaddr;   /* IP address of remote peer (network byte order) */
+  union ip_binding_u u;   /* IP address binding */
   uint16_t lport;         /* Bound local port number (network byte order) */
   uint16_t rport;         /* Remote port number (network byte order) */
   uint8_t  ttl;           /* Default time-to-live */
diff --git a/net/udp/udp_conn.c b/net/udp/udp_conn.c
index fd73b9a2d4..f50057255d 100644
--- a/net/udp/udp_conn.c
+++ b/net/udp/udp_conn.c
@@ -150,11 +150,11 @@ static FAR struct udp_conn_s *udp_find_conn(uint16_t portno)
        */
 
       if (conn->lport == portno &&
-          (net_ipaddr_cmp(conn->lipaddr, ipaddr) ||
+          (net_ipaddr_cmp(conn->u.ipv4.laddr, ipaddr) ||
 #ifdef CONFIG_NET_IPv6
-           net_ipaddr_cmp(conn->lipaddr, g_allzeroaddr)))
+           net_ipaddr_cmp(conn->u.ipv4.laddr, g_allzeroaddr)))
 #else
-           net_ipaddr_cmp(conn->lipaddr, INADDR_ANY)))
+           net_ipaddr_cmp(conn->u.ipv4.laddr, INADDR_ANY)))
 #endif
         {
           return conn;
@@ -368,7 +368,7 @@ FAR struct udp_conn_s *udp_active(FAR struct net_driver_s *dev,
        *   IP address is available and we will insist that the
        *   destination IP matches the bound address (or the destination
        *   IP address is a broadcast address). If a socket is bound to
-       *   INADDRY_ANY (lipaddr), then it should receive all packets
+       *   INADDRY_ANY (laddr), then it should receive all packets
        *   directed to the port.
        * - Finally, if the connection is bound to a remote IP address,
        *   the source IP address of the packet is checked. Broadcast
@@ -381,13 +381,13 @@ FAR struct udp_conn_s *udp_active(FAR struct net_driver_s *dev,
       if (conn->lport != 0 && udp->destport == conn->lport &&
           (conn->rport == 0 || udp->srcport == conn->rport) &&
 #ifdef CONFIG_NETDEV_MULTINIC
-          (net_ipaddr_cmp(conn->lipaddr, g_allzeroaddr) ||
-           net_ipaddr_cmp(conn->lipaddr, g_alloneaddr) ||
-           net_ipaddr_hdrcmp(ip->destipaddr, &conn->lipaddr)) &&
+          (net_ipaddr_cmp(conn->u.ipv4.laddr, g_allzeroaddr) ||
+           net_ipaddr_cmp(conn->u.ipv4.laddr, g_alloneaddr) ||
+           net_ipaddr_hdrcmp(ip->destipaddr, &conn->u.ipv4.laddr)) &&
 #endif
-          (net_ipaddr_cmp(conn->ripaddr, g_allzeroaddr) ||
-           net_ipaddr_cmp(conn->ripaddr, g_alloneaddr) ||
-           net_ipaddr_hdrcmp(ip->srcipaddr, &conn->ripaddr)))
+          (net_ipaddr_cmp(conn->u.ipv4.raddr, g_allzeroaddr) ||
+           net_ipaddr_cmp(conn->u.ipv4.raddr, g_alloneaddr) ||
+           net_ipaddr_hdrcmp(ip->srcipaddr, &conn->u.ipv4.raddr)))
         {
           /* Matching connection found.. return a reference to it */
 
@@ -467,7 +467,7 @@ int udp_bind(FAR struct udp_conn_s *conn, FAR const struct sockaddr_in *addr)
    * for receiving (Sending will use the default port).
    */
 
-  net_ipaddr_copy(conn->lipaddr, ipaddr);
+  net_ipaddr_copy(conn->u.ipv4.laddr, ipaddr);
 #endif
 
   /* Is the user requesting to bind to any port? */
@@ -553,7 +553,7 @@ int udp_connect(FAR struct udp_conn_s *conn,
        */
 
 #ifdef CONFIG_NETDEV_MULTINIC
-      conn->lport = htons(udp_select_port(conn->lipaddr));
+      conn->lport = htons(udp_select_port(conn->u.ipv4.laddr));
 #else
       conn->lport = htons(udp_select_port());
 #endif
@@ -564,12 +564,12 @@ int udp_connect(FAR struct udp_conn_s *conn,
   if (addr)
     {
       conn->rport = addr->sin_port;
-      net_ipaddr_copy(conn->ripaddr, addr->sin_addr.s_addr);
+      net_ipaddr_copy(conn->u.ipv4.raddr, addr->sin_addr.s_addr);
     }
   else
     {
       conn->rport = 0;
-      net_ipaddr_copy(conn->ripaddr, g_allzeroaddr);
+      net_ipaddr_copy(conn->u.ipv4.raddr, g_allzeroaddr);
     }
 
   conn->ttl = IP_TTL;
diff --git a/net/udp/udp_send.c b/net/udp/udp_send.c
index 098d7c4fcc..4455813f02 100644
--- a/net/udp/udp_send.c
+++ b/net/udp/udp_send.c
@@ -126,7 +126,7 @@ void udp_send(struct net_driver_s *dev, struct udp_conn_s *conn)
       pudpbuf->ttl         = conn->ttl;
 
       net_ipaddr_copy(pudpbuf->srcipaddr, &dev->d_ipaddr);
-      net_ipaddr_copy(pudpbuf->destipaddr, &conn->ripaddr);
+      net_ipaddr_copy(pudpbuf->destipaddr, &conn->u.ipv4.raddr);
 
 #else /* CONFIG_NET_IPv6 */
 
@@ -143,7 +143,7 @@ void udp_send(struct net_driver_s *dev, struct udp_conn_s *conn)
       pudpbuf->proto       = IP_PROTO_UDP;
 
       net_ipaddr_hdrcopy(pudpbuf->srcipaddr, &dev->d_ipaddr);
-      net_ipaddr_hdrcopy(pudpbuf->destipaddr, &conn->ripaddr);
+      net_ipaddr_hdrcopy(pudpbuf->destipaddr, &conn->u.ipv4.raddr);
 
       /* Calculate IP checksum. */