diff --git a/src/bpf.c b/src/bpf.c
index b6fbd90..378817a 100644
--- a/src/bpf.c
+++ b/src/bpf.c
@@ -147,7 +147,7 @@ int iface_enumerate(int family, void *parm, int (*callback)())
 		  addr->s6_addr[3] = 0;
 		}
 	      
-	      if (!((*callback)(addr, prefix, scope_id, iface_index, 0, parm)))
+	      if (!((*callback)(addr, prefix, scope_id, iface_index, 0, 0, 0, parm)))
 		goto err;
 	}
 #endif
diff --git a/src/dhcp-common.c b/src/dhcp-common.c
index 30aad56..0da1bd3 100644
--- a/src/dhcp-common.c
+++ b/src/dhcp-common.c
@@ -333,83 +333,6 @@ void dhcp_update_configs(struct dhcp_config *configs)
 
 }
 
-#ifdef HAVE_DHCP6
-static int join_multicast_worker(struct in6_addr *local, int prefix, 
-				 int scope, int if_index, int dad, void *vparam)
-{
-  char ifrn_name[IFNAMSIZ];
-  struct ipv6_mreq mreq;
-  int fd, i, max = *((int *)vparam);
-  struct iname *tmp;
-
-  (void)prefix;
-  (void)scope;
-  (void)dad;
-  
-  /* record which interfaces we join on, so that we do it at most one per 
-     interface, even when they have multiple addresses. Use outpacket
-     as an array of int, since it's always allocated here and easy
-     to expand for theoretical vast numbers of interfaces. */
-  for (i = 0; i < max; i++)
-    if (if_index == ((int *)daemon->outpacket.iov_base)[i])
-      return 1;
-  
-  if ((fd = socket(PF_INET6, SOCK_DGRAM, 0)) == -1)
-    return 0;
-  
-  if (!indextoname(fd, if_index, ifrn_name))
-    {
-      close(fd);
-      return 0;
-    }
-  
-  close(fd);
-
-  /* Are we doing DHCP on this interface? */
-  if (!iface_check(AF_INET6, (struct all_addr *)local, ifrn_name, NULL))
-    return 1;
- 
-  for (tmp = daemon->dhcp_except; tmp; tmp = tmp->next)
-    if (tmp->name && (strcmp(tmp->name, ifrn_name) == 0))
-      return 1;
-
-  mreq.ipv6mr_interface = if_index;
-  
-  inet_pton(AF_INET6, ALL_RELAY_AGENTS_AND_SERVERS, &mreq.ipv6mr_multiaddr);
-  
-  if (daemon->dhcp6 &&
-      setsockopt(daemon->dhcp6fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq, sizeof(mreq)) == -1)
-    return 0;
-
-  inet_pton(AF_INET6, ALL_SERVERS, &mreq.ipv6mr_multiaddr);
-  
-  if (daemon->dhcp6 && 
-      setsockopt(daemon->dhcp6fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq, sizeof(mreq)) == -1)
-    return 0;
-  
-  inet_pton(AF_INET6, ALL_ROUTERS, &mreq.ipv6mr_multiaddr);
-  
-  if (daemon->ra_contexts &&
-      setsockopt(daemon->icmp6fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq, sizeof(mreq)) == -1)
-    return 0;
-  
-  expand_buf(&daemon->outpacket, (max+1) * sizeof(int));
-  ((int *)daemon->outpacket.iov_base)[max++] = if_index;
-  
-  *((int *)vparam) = max;
-  
-  return 1;
-}
-
-void join_multicast(void)
-{
-  int count = 0;
-
-   if (!iface_enumerate(AF_INET6, &count, join_multicast_worker))
-     die(_("failed to join DHCPv6 multicast group: %s"), NULL, EC_BADNET);
-}
-#endif
-
 #ifdef HAVE_LINUX_NETWORK 
 void bindtodevice(int fd)
 {
@@ -750,4 +673,75 @@ char *option_string(int prot, unsigned int opt, unsigned char *val, int opt_len,
 
 }
 
+void log_context(int family, struct dhcp_context *context)
+{
+  /* Cannot use dhcp_buff* for RA contexts */
+
+  void *start = &context->start;
+  void *end = &context->end;
+	  	  
+#ifdef HAVE_DHCP6
+  if (family == AF_INET6)
+    {
+      struct in6_addr subnet = context->start6;
+      if (!(context->flags & CONTEXT_TEMPLATE))
+	setaddr6part(&subnet, 0);
+      inet_ntop(AF_INET6, &subnet, daemon->addrbuff, ADDRSTRLEN); 
+      start = &context->start6;
+      end = &context->end6;
+    }
+#endif
+	
+  if (context->flags & CONTEXT_CONSTRUCTED)
+    sprintf(daemon->namebuff, "constructed for %s", context->template_interface);
+  else if (context->flags & CONTEXT_TEMPLATE)
+    sprintf(daemon->namebuff, "template for %s", context->template_interface);  
+  else
+    {
+      if (family != AF_INET && (context->flags & CONTEXT_DEPRECATE))
+	strcpy(daemon->namebuff, _("prefix deprecated"));
+      else
+	{
+	  char *p = daemon->namebuff;
+	  
+	  p += sprintf(p, _("lease time "));
+	  prettyprint_time(p, context->lease_time);
+	}
+    }
+	  
+  if ((context->flags & CONTEXT_DHCP) || family == AF_INET) 
+    {
+      inet_ntop(family, start, daemon->dhcp_buff, 256);
+      inet_ntop(family, end, daemon->dhcp_buff3, 256);
+      my_syslog(MS_DHCP | LOG_INFO, 
+	      (context->flags & CONTEXT_RA_STATELESS) ? 
+	      _("%s stateless on %s%.0s%.0s") :
+	      (context->flags & CONTEXT_STATIC) ? 
+	      _("%s, static leases only on %.0s%s, %s") :
+	      (context->flags & CONTEXT_PROXY) ?
+	      _("%s, proxy on subnet %.0s%s%.0s") :
+	      _("%s, IP range %s -- %s, %s"),
+	      (family != AF_INET) ? "DHCPv6" : "DHCP",
+	      daemon->dhcp_buff, daemon->dhcp_buff3, daemon->namebuff);
+    }
+  
+  if (context->flags & CONTEXT_RA_NAME)
+    my_syslog(MS_DHCP | LOG_INFO, _("DHCPv4-derived IPv6 names on %s"), 
+	      daemon->addrbuff);
+  
+       
+  if (context->flags & (CONTEXT_RA_ONLY | CONTEXT_RA_NAME | CONTEXT_RA_STATELESS))
+    {
+      if (!(context->flags & (CONTEXT_DEPRECATE | CONTEXT_CONSTRUCTED | CONTEXT_TEMPLATE)))
+	{
+	  char *p = daemon->namebuff;
+	  p += sprintf(p, _("prefix valid "));
+	  prettyprint_time(p, context->lease_time > 7200 ? context->lease_time : 7200);
+	}
+      my_syslog(MS_DHCP | LOG_INFO, _("router advertisement on %s %s"), 
+		daemon->addrbuff, daemon->namebuff);
+    }
+}
+      
+
 #endif
diff --git a/src/dhcp6.c b/src/dhcp6.c
index ba53f0f..48d0d50 100644
--- a/src/dhcp6.c
+++ b/src/dhcp6.c
@@ -25,7 +25,8 @@ struct iface_param {
 };
 
 static int complete_context6(struct in6_addr *local,  int prefix,
-			     int scope, int if_index, int dad, void *vparam);
+			     int scope, int if_index, int dad, 
+			     int preferred, int valid, void *vparam);
 
 static int make_duid1(int index, unsigned int type, char *mac, size_t maclen, void *parm); 
 
@@ -181,7 +182,8 @@ void dhcp6_packet(time_t now)
 }
 
 static int complete_context6(struct in6_addr *local,  int prefix,
-			     int scope, int if_index, int dad, void *vparam)
+			     int scope, int if_index, int dad, int preferred, 
+			     int valid, void *vparam)
 {
   struct dhcp_context *context;
   struct iface_param *param = vparam;
@@ -189,6 +191,8 @@ static int complete_context6(struct in6_addr *local,  int prefix,
  
   (void)scope; /* warning */
   (void)dad;
+  (void)preferred;
+  (void)valid;
       
   if (if_index == param->ind &&
       !IN6_IS_ADDR_LOOPBACK(local) &&
@@ -467,6 +471,212 @@ static int make_duid1(int index, unsigned int type, char *mac, size_t maclen, vo
 
   return 0;
 }
+
+struct cparam {
+  time_t now;
+  int newone;
+};
+
+static int construct_worker(struct in6_addr *local, int prefix, 
+			    int scope, int if_index, int dad, 
+			    int preferred, int valid, void *vparam)
+{
+  char ifrn_name[IFNAMSIZ];
+  struct in6_addr start6, end6;
+  struct dhcp_context *template, *context;
+
+  (void)scope;
+  (void)dad;
+
+  struct cparam *param = vparam;
+
+  if (IN6_IS_ADDR_LOOPBACK(local) ||
+      IN6_IS_ADDR_LINKLOCAL(local) ||
+      IN6_IS_ADDR_MULTICAST(local))
+    return 1;
+
+  if (!indextoname(daemon->doing_dhcp6 ? daemon->dhcp6fd : daemon->icmp6fd, if_index, ifrn_name))
+    return 0;
+  
+  for (template = daemon->dhcp6; template; template = template->next)
+    if (!(template->flags & CONTEXT_TEMPLATE))
+      {
+	/* non-template entries, just fill in interface and local addresses */
+	if (prefix == template->prefix &&
+	    is_same_net6(local, &template->start6, prefix) &&
+	    is_same_net6(local, &template->end6, prefix))
+	  {
+	    template->if_index = if_index;
+	    template->local6 = *local;
+	  }
+	
+      }
+    else if (strcmp(ifrn_name, template->template_interface) == 0 &&
+	     addr6part(local) == addr6part(&template->start6))
+      {
+	start6 = *local;
+	setaddr6part(&start6, addr6part(&template->start6));
+	end6 = *local;
+	setaddr6part(&end6, addr6part(&template->end6));
+	
+	for (context = daemon->dhcp6; context; context = context->next)
+	  if ((context->flags & CONTEXT_CONSTRUCTED) &&
+	      IN6_ARE_ADDR_EQUAL(&start6, &context->start6) &&
+	      IN6_ARE_ADDR_EQUAL(&end6, &context->end6))
+	    {
+	      context->flags &= ~CONTEXT_GC;
+	      break;
+	    }
+	
+	if (!context && (context = whine_malloc(sizeof (struct dhcp_context))))
+	  {
+	    *context = *template;
+	    context->start6 = start6;
+	    context->end6 = end6;
+	    context->flags &= ~CONTEXT_TEMPLATE;
+	    context->flags |= CONTEXT_CONSTRUCTED;
+	    context->if_index = if_index;
+	    context->local6 = *local;
+	    context->lease_time = param->now + valid;
+	    
+	    context->next = daemon->dhcp6;
+	    daemon->dhcp6 = context;
+
+	    ra_start_unsolicted(dnsmasq_time(), context);
+	    /* we created a new one, need to call
+	       lease_update_file to get periodic functions called */
+	    param->newone = 1; 
+	    
+	    log_context(AF_INET6, context);
+	  } 
+
+	if (context)
+	  {
+	    if (valid == -1)
+	      context->valid = valid;
+	    else
+	      context->valid = valid + param->now;
+	    
+	    if (preferred == -1)
+	      context->preferred = preferred;
+	    else
+	      context->preferred = preferred + param->now;
+	  }
+      }
+  
+  return 1;
+}
+
+void dhcp_construct_contexts(time_t now)
+{ 
+  struct dhcp_context *tmp, *context, **up;
+  struct cparam param;
+  param.newone = 0;
+  param.now = now;
+
+  for (context = daemon->dhcp6; context; context = context->next)
+    if (context->flags & CONTEXT_CONSTRUCTED)
+      context->flags |= CONTEXT_GC;
+  
+  iface_enumerate(AF_INET6, &param, construct_worker);
+
+  for (up = &daemon->dhcp6, context = daemon->dhcp6; context; context = tmp)
+    {
+      tmp = context->next;
+      
+      if (context->flags & CONTEXT_GC)
+	{
+	  if (daemon->dhcp6 == context)
+	    daemon->dhcp6 = context->next;
+	  *up = context->next;
+	  free(context);
+	}
+      else
+	up = &context->next;
+    }
+  
+  if (param.newone)
+    lease_update_file(now);
+}
+      
+static int join_multicast_worker(struct in6_addr *local, int prefix, 
+				 int scope, int if_index, int dad, 
+				 int preferred, int valid, void *vparam)
+{
+  char ifrn_name[IFNAMSIZ];
+  struct ipv6_mreq mreq;
+  int fd, i, max = *((int *)vparam);
+  struct iname *tmp;
+
+  (void)prefix;
+  (void)scope;
+  (void)dad;
+  (void)preferred;
+  (void)valid;
+  
+  /* record which interfaces we join on, so that we do it at most one per 
+     interface, even when they have multiple addresses. Use outpacket
+     as an array of int, since it's always allocated here and easy
+     to expand for theoretical vast numbers of interfaces. */
+  for (i = 0; i < max; i++)
+    if (if_index == ((int *)daemon->outpacket.iov_base)[i])
+      return 1;
+  
+  if ((fd = socket(PF_INET6, SOCK_DGRAM, 0)) == -1)
+    return 0;
+  
+  if (!indextoname(fd, if_index, ifrn_name))
+    {
+      close(fd);
+      return 0;
+    }
+  
+  close(fd);
+
+  /* Are we doing DHCP on this interface? */
+  if (!iface_check(AF_INET6, (struct all_addr *)local, ifrn_name, NULL))
+    return 1;
+ 
+  for (tmp = daemon->dhcp_except; tmp; tmp = tmp->next)
+    if (tmp->name && (strcmp(tmp->name, ifrn_name) == 0))
+      return 1;
+
+  mreq.ipv6mr_interface = if_index;
+  
+  inet_pton(AF_INET6, ALL_RELAY_AGENTS_AND_SERVERS, &mreq.ipv6mr_multiaddr);
+  
+  if (daemon->doing_dhcp6 &&
+      setsockopt(daemon->dhcp6fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq, sizeof(mreq)) == -1)
+    return 0;
+
+  inet_pton(AF_INET6, ALL_SERVERS, &mreq.ipv6mr_multiaddr);
+  
+  if (daemon->doing_dhcp6 && 
+      setsockopt(daemon->dhcp6fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq, sizeof(mreq)) == -1)
+    return 0;
+  
+  inet_pton(AF_INET6, ALL_ROUTERS, &mreq.ipv6mr_multiaddr);
+  
+  if (daemon->doing_ra &&
+      setsockopt(daemon->icmp6fd, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq, sizeof(mreq)) == -1)
+    return 0;
+  
+  expand_buf(&daemon->outpacket, (max+1) * sizeof(int));
+  ((int *)daemon->outpacket.iov_base)[max++] = if_index;
+  
+  *((int *)vparam) = max;
+  
+  return 1;
+}
+
+void join_multicast(void)
+{
+  int count = 0;
+
+   if (!iface_enumerate(AF_INET6, &count, join_multicast_worker))
+     die(_("failed to join DHCPv6 multicast group: %s"), NULL, EC_BADNET);
+}
+
 #endif
 
 
diff --git a/src/dnsmasq.c b/src/dnsmasq.c
index 9d90b4d..7a9d340 100644
--- a/src/dnsmasq.c
+++ b/src/dnsmasq.c
@@ -51,6 +51,7 @@ int main (int argc, char **argv)
   cap_user_header_t hdr = NULL;
   cap_user_data_t data = NULL;
 #endif 
+  struct dhcp_context *context;
 
 #ifdef LOCALEDIR
   setlocale(LC_ALL, "");
@@ -167,40 +168,44 @@ int main (int argc, char **argv)
   
 #ifdef HAVE_DHCP
   if (daemon->dhcp || daemon->dhcp6)
-    {
+    { 
+      
+#  ifdef HAVE_DHCP6
+      if (daemon->dhcp6)
+	{
+	  daemon->doing_ra = option_bool(OPT_RA);
+	  
+	  for (context = daemon->dhcp6; context; context = context->next)
+	    {
+	      if (context->flags & CONTEXT_DHCP)
+		daemon->doing_dhcp6 = 1;
+	      if (context->flags & (CONTEXT_RA_ONLY | CONTEXT_RA_NAME | CONTEXT_RA_STATELESS))
+		daemon->doing_ra = 1;
+	    }
+	}
+#  endif
+
       /* Note that order matters here, we must call lease_init before
 	 creating any file descriptors which shouldn't be leaked
 	 to the lease-script init process. We need to call common_init
 	 before lease_init to allocate buffers it uses.*/
-      dhcp_common_init();
-      lease_init(now);
-  
+      if (daemon->dhcp || daemon->doing_dhcp6)
+	{
+	  dhcp_common_init();
+	  lease_init(now);
+	}
+
       if (daemon->dhcp)
 	dhcp_init();
-    }
-  
+ 
 #  ifdef HAVE_DHCP6
-  /* Start RA subsystem if --enable-ra OR dhcp-range=<subnet>, ra-only */
-  if (daemon->ra_contexts || option_bool(OPT_RA))
-    {
-      /* link the DHCP6 contexts to the ra-only ones so we can traverse them all 
-	 from ->ra_contexts, but only the non-ra-onlies from ->dhcp6 */
-      struct dhcp_context *context;
+      if (daemon->doing_ra)
+	ra_init(now);
       
-      if (!daemon->ra_contexts)
-	daemon->ra_contexts = daemon->dhcp6;
-      else
-	{
-	  for (context = daemon->ra_contexts; context->next; context = context->next);
-	  context->next = daemon->dhcp6;
-	}
-      ra_init(now);
-    }
-
-  if (daemon->dhcp6)
-    dhcp6_init();
-
+      if (daemon->doing_dhcp6)
+	dhcp6_init();
 #  endif
+    }
 
 #endif
 
@@ -214,13 +219,13 @@ int main (int argc, char **argv)
 
 #ifdef HAVE_DHCP6
   /* after netlink_init */
-  if (daemon->ra_contexts || daemon->dhcp6)
+  if (daemon->doing_dhcp6 || daemon->doing_ra)
     join_multicast();
 #endif
 
 #ifdef HAVE_DHCP
   /* after netlink_init */
-  if (daemon->dhcp || daemon->dhcp6)
+  if (daemon->dhcp || daemon->doing_dhcp6)
     lease_find_interfaces(now);
 #endif
 
@@ -628,90 +633,24 @@ int main (int argc, char **argv)
 
   if (daemon->max_logs != 0)
     my_syslog(LOG_INFO, _("asynchronous logging enabled, queue limit is %d messages"), daemon->max_logs);
- 
-  if (daemon->ra_contexts)
-    my_syslog(MS_DHCP | LOG_INFO, _("IPv6 router advertisement enabled"));
+  
 
 #ifdef HAVE_DHCP
-  if (daemon->dhcp || daemon->dhcp6 || daemon->ra_contexts)
-    {
-      struct dhcp_context *dhcp_tmp;
-      int family = AF_INET;
-      dhcp_tmp = daemon->dhcp;
-     
-#ifdef HAVE_DHCP6
-    again:
-#endif
-      for (; dhcp_tmp; dhcp_tmp = dhcp_tmp->next)
-	{
-	  void *start = &dhcp_tmp->start;
-	  void *end = &dhcp_tmp->end;
-	  	  
-#ifdef HAVE_DHCP6
-	  if (family == AF_INET6)
-	    {
-	      start = &dhcp_tmp->start6;
-	      end = &dhcp_tmp->end6;
-	      struct in6_addr subnet = dhcp_tmp->start6;
-	      setaddr6part(&subnet, 0);
-	      inet_ntop(AF_INET6, &subnet, daemon->dhcp_buff2, 256);
-	    }
-#endif
-	  
-	  if (family != AF_INET && (dhcp_tmp->flags & CONTEXT_DEPRECATE))
-	    strcpy(daemon->namebuff, _("prefix deprecated"));
-	  else
-	    {
-	      char *p = daemon->namebuff;
-	      p += sprintf(p, _("lease time "));
-	      prettyprint_time(p, dhcp_tmp->lease_time);
-	    }
-	  
-	  inet_ntop(family, start, daemon->dhcp_buff, 256);
-	  inet_ntop(family, end, daemon->dhcp_buff3, 256);
-	  if ((dhcp_tmp->flags & CONTEXT_DHCP) || family == AF_INET) 
-	    my_syslog(MS_DHCP | LOG_INFO, 
-		      (dhcp_tmp->flags & CONTEXT_RA_STATELESS) ? 
-		      _("%s stateless on %s%.0s%.0s") :
-		      (dhcp_tmp->flags & CONTEXT_STATIC) ? 
-		      _("%s, static leases only on %.0s%s, %s") :
-		      (dhcp_tmp->flags & CONTEXT_PROXY) ?
-		      _("%s, proxy on subnet %.0s%s%.0s") :
-		      _("%s, IP range %s -- %s, %s"),
-		      (family != AF_INET) ? "DHCPv6" : "DHCP",
-		      daemon->dhcp_buff, daemon->dhcp_buff3, daemon->namebuff);
+  for (context = daemon->dhcp; context; context = context->next)
+    log_context(AF_INET, context);
 
-	  if (dhcp_tmp->flags & CONTEXT_RA_NAME)
-	    my_syslog(MS_DHCP | LOG_INFO, _("DHCPv4-derived IPv6 names on %s"), 
-		      daemon->dhcp_buff2);
-	  if (dhcp_tmp->flags & (CONTEXT_RA_ONLY | CONTEXT_RA_NAME | CONTEXT_RA_STATELESS))
-	    {
-	      if (!(dhcp_tmp->flags & CONTEXT_DEPRECATE))
-		{
-		  char *p = daemon->namebuff;
-		  p += sprintf(p, _("prefix valid "));
-		  prettyprint_time(p, dhcp_tmp->lease_time > 7200 ? dhcp_tmp->lease_time : 7200);
-		}
-	      my_syslog(MS_DHCP | LOG_INFO, _("SLAAC on %s %s"), 
-			daemon->dhcp_buff2, daemon->namebuff);
-	    }
-	}
-      
-#ifdef HAVE_DHCP6
-      if (family == AF_INET)
-	{
-	  family = AF_INET6;
-	  if (daemon->ra_contexts)
-	    dhcp_tmp = daemon->ra_contexts;
-	  else
-	    dhcp_tmp = daemon->dhcp6;
-	  goto again;
-	}
-#endif
+#  ifdef HAVE_DHCP6
+  for (context = daemon->dhcp6; context; context = context->next)
+    log_context(AF_INET6, context);
 
-    }
-#endif
+  if (daemon->doing_dhcp6 || daemon->doing_ra)
+    dhcp_construct_contexts(now);
+  
+  if (option_bool(OPT_RA))
+    my_syslog(MS_DHCP | LOG_INFO, _("IPv6 router advertisement enabled"));
+#  endif
 
+#endif
 
 #ifdef HAVE_TFTP
 	if (option_bool(OPT_TFTP))
@@ -818,13 +757,13 @@ int main (int argc, char **argv)
 #endif
 
 #ifdef HAVE_DHCP6
-      if (daemon->dhcp6)
+      if (daemon->doing_dhcp6)
 	{
 	  FD_SET(daemon->dhcp6fd, &rset);
 	  bump_maxfd(daemon->dhcp6fd, &maxfd);
 	}
 
-      if (daemon->ra_contexts)
+      if (daemon->doing_ra)
 	{
 	  FD_SET(daemon->icmp6fd, &rset);
 	  bump_maxfd(daemon->icmp6fd, &maxfd); 
@@ -888,7 +827,7 @@ int main (int argc, char **argv)
 
 #ifdef HAVE_LINUX_NETWORK
       if (FD_ISSET(daemon->netlinkfd, &rset))
-	netlink_multicast();
+	netlink_multicast(now);
 #endif
 
       /* Check for changes to resolv files once per second max. */
@@ -936,11 +875,11 @@ int main (int argc, char **argv)
 	}
 
 #ifdef HAVE_DHCP6
-      if (daemon->dhcp6 && FD_ISSET(daemon->dhcp6fd, &rset))
+      if (daemon->doing_dhcp6 && FD_ISSET(daemon->dhcp6fd, &rset))
 	dhcp6_packet(now);
 
-      if (daemon->ra_contexts && FD_ISSET(daemon->icmp6fd, &rset))
-	icmp6_packet();
+      if (daemon->doing_ra && FD_ISSET(daemon->icmp6fd, &rset))
+	icmp6_packet(now);
 #endif
 
 #  ifdef HAVE_SCRIPT
@@ -1120,13 +1059,13 @@ static void async_event(int pipe, time_t now)
 	
       case EVENT_ALARM:
 #ifdef HAVE_DHCP
-	if (daemon->dhcp || daemon->dhcp6)
+	if (daemon->dhcp || daemon->doing_dhcp6)
 	  {
 	    lease_prune(NULL, now);
 	    lease_update_file(now);
 	  }
 #ifdef HAVE_DHCP6
-	else if (daemon->ra_contexts)
+	else if (daemon->doing_ra)
 	  /* Not doing DHCP, so no lease system, manage alarms for ra only */
 	    send_alarm(periodic_ra(now), now);
 #endif
@@ -1283,7 +1222,7 @@ void clear_cache_and_reload(time_t now)
     cache_reload();
   
 #ifdef HAVE_DHCP
-  if (daemon->dhcp || daemon->dhcp6)
+  if (daemon->dhcp || daemon->doing_dhcp6)
     {
       if (option_bool(OPT_ETHERS))
 	dhcp_read_ethers();
@@ -1294,7 +1233,7 @@ void clear_cache_and_reload(time_t now)
       lease_update_dns(1);
     }
 #ifdef HAVE_DHCP6
-  else if (daemon->ra_contexts)
+  else if (daemon->doing_ra)
     /* Not doing DHCP, so no lease system, manage 
        alarms for ra only */
     send_alarm(periodic_ra(now), now);
@@ -1597,7 +1536,7 @@ int icmp_ping(struct in_addr addr)
       set_log_writer(&wset, &maxfd);
       
 #ifdef HAVE_DHCP6
-      if (daemon->ra_contexts)
+      if (daemon->doing_ra)
 	{
 	  FD_SET(daemon->icmp6fd, &rset);
 	  bump_maxfd(daemon->icmp6fd, &maxfd); 
@@ -1616,8 +1555,8 @@ int icmp_ping(struct in_addr addr)
       check_dns_listeners(&rset, now);
 
 #ifdef HAVE_DHCP6
-      if (daemon->ra_contexts && FD_ISSET(daemon->icmp6fd, &rset))
-	icmp6_packet();
+      if (daemon->doing_ra && FD_ISSET(daemon->icmp6fd, &rset))
+	icmp6_packet(now);
 #endif
       
 #ifdef HAVE_TFTP
diff --git a/src/dnsmasq.h b/src/dnsmasq.h
index a2b0131..385fd3a 100644
--- a/src/dnsmasq.h
+++ b/src/dnsmasq.h
@@ -667,7 +667,7 @@ struct cond_domain {
 #endif
   int is6;
   struct cond_domain *next;
-};
+}; 
 
 struct dhcp_context {
   unsigned int lease_time, addr_epoch;
@@ -679,6 +679,8 @@ struct dhcp_context {
   struct in6_addr local6;
   int prefix, if_index;
   time_t ra_time;
+  char *template_interface;
+  int valid, preferred; /* times from address for constructed contexts */
 #endif
   int flags;
   struct dhcp_netid netid, *filter;
@@ -695,6 +697,11 @@ struct dhcp_context {
 #define CONTEXT_RA_STATELESS 128
 #define CONTEXT_DHCP         256
 #define CONTEXT_DEPRECATE    512
+#define CONTEXT_TEMPLATE    1024    /* create contexts using addresses */
+#define CONTEXT_CONSTRUCTED 2048
+#define CONTEXT_GC          4096
+#define CONTEXT_RA          8192
+
 
 struct ping_result {
   struct in_addr addr;
@@ -773,7 +780,7 @@ extern struct daemon {
   int port, query_port, min_port;
   unsigned long local_ttl, neg_ttl, max_ttl, max_cache_ttl, auth_ttl;
   struct hostsfile *addn_hosts;
-  struct dhcp_context *dhcp, *dhcp6, *ra_contexts;
+  struct dhcp_context *dhcp, *dhcp6;
   struct dhcp_config *dhcp_conf;
   struct dhcp_opt *dhcp_opts, *dhcp_match, *dhcp_opts6, *dhcp_match6;
   struct dhcp_vendor *dhcp_vendors;
@@ -784,6 +791,7 @@ extern struct daemon {
   struct addr_list *override_relays;
   int override;
   int enable_pxe;
+  int doing_ra, doing_dhcp6;
   struct dhcp_netid_list *dhcp_ignore, *dhcp_ignore_names, *dhcp_gen_names; 
   struct dhcp_netid_list *force_broadcast, *bootp_dynamic;
   struct hostsfile *dhcp_hosts_file, *dhcp_opts_file;
@@ -1074,7 +1082,7 @@ void poll_resolv(int force, int do_reload, time_t now);
 /* netlink.c */
 #ifdef HAVE_LINUX_NETWORK
 void netlink_init(void);
-void netlink_multicast(void);
+void netlink_multicast(time_t now);
 #endif
 
 /* bpf.c */
@@ -1142,6 +1150,8 @@ struct dhcp_config *find_config6(struct dhcp_config *configs,
 struct dhcp_config *config_find_by_address6(struct dhcp_config *configs, struct in6_addr *net, 
 					    int prefix, u64 addr);
 void make_duid(time_t now);
+void dhcp_construct_contexts(time_t now);
+void join_multicast(void);
 #endif
 
 /* rfc3315.c */
@@ -1172,8 +1182,8 @@ void bindtodevice(int fd);
 #endif
 #  ifdef HAVE_DHCP6
 void display_opts6(void);
-void join_multicast(void);
 #  endif
+void log_context(int family, struct dhcp_context *context);
 #endif
 
 /* outpacket.c */
@@ -1192,16 +1202,14 @@ void put_opt6_string(char *s);
 /* radv.c */
 #ifdef HAVE_DHCP6
 void ra_init(time_t now);
-void icmp6_packet(void);
+void icmp6_packet(time_t now);
 time_t periodic_ra(time_t now);
 void ra_start_unsolicted(time_t now, struct dhcp_context *context);
 #endif
 
 /* slaac.c */ 
 #ifdef HAVE_DHCP6
-void build_subnet_map(void);
 void slaac_add_addrs(struct dhcp_lease *lease, time_t now, int force);
 time_t periodic_slaac(time_t now, struct dhcp_lease *leases);
 void slaac_ping_reply(struct in6_addr *sender, unsigned char *packet, char *interface, struct dhcp_lease *leases);
-void schedule_subnet_map(void);
 #endif
diff --git a/src/lease.c b/src/lease.c
index ad4ee84..079a767 100644
--- a/src/lease.c
+++ b/src/lease.c
@@ -308,7 +308,7 @@ void lease_update_file(time_t now)
 
 #ifdef HAVE_DHCP6
   /* do timed RAs and determine when the next is, also pings to potential SLAAC addresses */
-  if (daemon->ra_contexts)
+  if (daemon->doing_ra)
     {
       time_t event;
       
@@ -363,12 +363,15 @@ static int find_interface_v4(struct in_addr local, int if_index,
 
 #ifdef HAVE_DHCP6
 static int find_interface_v6(struct in6_addr *local,  int prefix,
-			     int scope, int if_index, int dad, void *vparam)
+			     int scope, int if_index, int dad, 
+			     int preferred, int valid, void *vparam)
 {
   struct dhcp_lease *lease;
   
   (void)scope;
   (void)dad;
+  (void)preferred;
+  (void)valid;
 
   for (lease = leases; lease; lease = lease->next)
     if ((lease->flags & (LEASE_TA | LEASE_NA)))
@@ -395,10 +398,6 @@ void lease_ping_reply(struct in6_addr *sender, unsigned char *packet, char *inte
    start-time. */
 void lease_find_interfaces(time_t now)
 {
-#ifdef HAVE_DHCP6
-  build_subnet_map();
-#endif
-
   iface_enumerate(AF_INET, &now, find_interface_v4);
 #ifdef HAVE_DHCP6
   iface_enumerate(AF_INET6, &now, find_interface_v6);
diff --git a/src/netlink.c b/src/netlink.c
index 9951ed5..9090034 100644
--- a/src/netlink.c
+++ b/src/netlink.c
@@ -50,10 +50,14 @@ void netlink_init(void)
   addr.nl_pid = 0; /* autobind */
   addr.nl_groups = RTMGRP_IPV4_ROUTE;
   if (option_bool(OPT_CLEVERBIND))
-    addr.nl_groups |= RTMGRP_IPV4_IFADDR;
+    addr.nl_groups |= RTMGRP_IPV4_IFADDR;  
 #ifdef HAVE_IPV6
   addr.nl_groups |= RTMGRP_IPV6_ROUTE;
-  if (daemon->ra_contexts || option_bool(OPT_CLEVERBIND))
+  if (option_bool(OPT_CLEVERBIND))
+    addr.nl_groups |= RTMGRP_IPV6_IFADDR;
+#endif
+#ifdef HAVE_DHCP6
+  if (daemon->doing_ra || daemon->doing_dhcp6)
     addr.nl_groups |= RTMGRP_IPV6_IFADDR;
 #endif
   
@@ -187,7 +191,7 @@ int iface_enumerate(int family, void *parm, int (*callback)())
 	if (h->nlmsg_seq != seq || h->nlmsg_pid != netlink_pid || h->nlmsg_type == NLMSG_ERROR)
 	  {
 	    /* May be multicast arriving async */
-	    if (nl_async(h) && option_bool(OPT_CLEVERBIND))
+	    if (nl_async(h))
 	      newaddr = 1; 
 	  }
 	else if (h->nlmsg_type == NLMSG_DONE)
@@ -196,10 +200,15 @@ int iface_enumerate(int family, void *parm, int (*callback)())
 	       after we complete as we're not re-entrant */
 	    if (newaddr) 
 	      {
-		enumerate_interfaces();
-		create_bound_listeners(0);
+		if (option_bool(OPT_CLEVERBIND))
+		  {
+		    enumerate_interfaces();
+		    create_bound_listeners(0);
+		  }
+#ifdef HAVE_DHCP6
+		dhcp_construct_contexts(dnsmasq_time());
+#endif
 	      }
-	    
 	    return callback_ok;
 	  }
 	else if (h->nlmsg_type == RTM_NEWADDR && family != AF_UNSPEC && family != AF_LOCAL)
@@ -236,17 +245,24 @@ int iface_enumerate(int family, void *parm, int (*callback)())
 		else if (ifa->ifa_family == AF_INET6)
 		  {
 		    struct in6_addr *addrp = NULL;
+		    u32 valid = 0, preferred = 0;
 		    while (RTA_OK(rta, len1))
 		      {
 			if (rta->rta_type == IFA_ADDRESS)
 			  addrp = ((struct in6_addr *)(rta+1)); 
-			
+			else if (rta->rta_type == IFA_CACHEINFO)
+			  {
+			    struct ifa_cacheinfo *ifc = (struct ifa_cacheinfo *)(rta+1);
+			    preferred = ifc->ifa_prefered;
+			    valid = ifc->ifa_valid;
+			  }
 			rta = RTA_NEXT(rta, len1);
 		      }
 		    
 		    if (addrp && callback_ok)
 		      if (!((*callback)(addrp, (int)(ifa->ifa_prefixlen), (int)(ifa->ifa_scope), 
-					(int)(ifa->ifa_index), (int)(ifa->ifa_flags & IFA_F_TENTATIVE), parm)))
+					(int)(ifa->ifa_index), (int)(ifa->ifa_flags & IFA_F_TENTATIVE), 
+					(int) preferred, (int)valid, parm)))
 			callback_ok = 0;
 		  }
 #endif
@@ -305,7 +321,7 @@ int iface_enumerate(int family, void *parm, int (*callback)())
     }
 }
 
-void netlink_multicast(void)
+void netlink_multicast(time_t now)
 {
   ssize_t len;
   struct nlmsghdr *h;
@@ -318,7 +334,7 @@ void netlink_multicast(void)
   
   if ((len = netlink_recv()) != -1)
     for (h = (struct nlmsghdr *)iov.iov_base; NLMSG_OK(h, (size_t)len); h = NLMSG_NEXT(h, len))
-      if (nl_async(h) && option_bool(OPT_CLEVERBIND))
+      if (nl_async(h))
 	newaddr = 1;
   
   /* restore non-blocking status */
@@ -326,8 +342,14 @@ void netlink_multicast(void)
 
   if (newaddr) 
     {
-      enumerate_interfaces();
-      create_bound_listeners(0);
+      if (option_bool(OPT_CLEVERBIND))
+	{
+	  enumerate_interfaces();
+	  create_bound_listeners(0);
+	}
+#ifdef HAVE_DHCP6
+      dhcp_construct_contexts(now);
+#endif
     }
 }
 
@@ -371,21 +393,8 @@ static int nl_async(struct nlmsghdr *h)
 	}
       return 0;
     }
-  else if (h->nlmsg_type == RTM_NEWADDR) 
-    {
-#ifdef HAVE_DHCP6
-      /* force RAs to sync new network and pick up new interfaces.  */
-      if (daemon->ra_contexts)
-	{
-	  schedule_subnet_map();
-	  ra_start_unsolicted(dnsmasq_time(), NULL);
-	  /* cause lease_update_file to run after we return, in case we were called from
-	     iface_enumerate and can't re-enter it now */
-	  send_alarm(0, 0);
-	}
-#endif	 
-      return 1; /* clever bind mode - rescan */
-    }	 
+  else if (h->nlmsg_type == RTM_NEWADDR || h->nlmsg_type == RTM_DELADDR) 
+    return 1; /* clever bind mode - rescan */
   
   return 0;
 }
diff --git a/src/network.c b/src/network.c
index 3adba86..c534092 100644
--- a/src/network.c
+++ b/src/network.c
@@ -289,7 +289,8 @@ static int iface_allowed(struct irec **irecp, int if_index,
 
 #ifdef HAVE_IPV6
 static int iface_allowed_v6(struct in6_addr *local, int prefix, 
-			    int scope, int if_index, int dad, void *vparam)
+			    int scope, int if_index, int dad, 
+			    int preferred, int valid, void *vparam)
 {
   union mysockaddr addr;
   struct in_addr netmask; /* dummy */
@@ -297,6 +298,8 @@ static int iface_allowed_v6(struct in6_addr *local, int prefix,
 
   (void)prefix; /* warning */
   (void)scope; /* warning */
+  (void)preferred;
+  (void)valid;
   
   memset(&addr, 0, sizeof(addr));
 #ifdef HAVE_SOCKADDR_SA_LEN
diff --git a/src/option.c b/src/option.c
index 0ecc0f5..b765f90 100644
--- a/src/option.c
+++ b/src/option.c
@@ -2180,7 +2180,7 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
     case 'F':  /* --dhcp-range */
       {
 	int k, leasepos = 2;
-	char *cp, *a[7] = { NULL, NULL, NULL, NULL, NULL, NULL, NULL };
+	char *cp, *a[8] = { NULL, NULL, NULL, NULL, NULL, NULL, NULL };
 	struct dhcp_context *new = opt_malloc(sizeof(struct dhcp_context));
 	
 	memset (new, 0, sizeof(*new));
@@ -2227,7 +2227,7 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
 	      }
 	  }
 	
-	for (k = 1; k < 7; k++)
+	for (k = 1; k < 8; k++)
 	  if (!(a[k] = split(a[k-1])))
 	    break;
 	
@@ -2284,28 +2284,25 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
 		if (strcmp(a[leasepos], "static") == 0)
 		  new->flags |= CONTEXT_STATIC | CONTEXT_DHCP;
 		else if (strcmp(a[leasepos], "ra-only") == 0 || strcmp(a[leasepos], "slaac") == 0 )
-		  new->flags |= CONTEXT_RA_ONLY;
+		  new->flags |= CONTEXT_RA_ONLY | CONTEXT_RA;
 		else if (strcmp(a[leasepos], "ra-names") == 0)
-		  new->flags |= CONTEXT_RA_NAME;
+		  new->flags |= CONTEXT_RA_NAME | CONTEXT_RA;
 		else if (strcmp(a[leasepos], "ra-stateless") == 0)
-		  new->flags |= CONTEXT_RA_STATELESS | CONTEXT_DHCP;
+		  new->flags |= CONTEXT_RA_STATELESS | CONTEXT_DHCP | CONTEXT_RA;
 		else if (leasepos == 1 && inet_pton(AF_INET6, a[leasepos], &new->end6))
 		  new->flags |= CONTEXT_DHCP; 
+		else if (strstr(a[leasepos], "constructor:") == a[leasepos])
+		  {
+		    new->template_interface = opt_string_alloc(a[leasepos] + 12);
+		    new->flags |= CONTEXT_TEMPLATE;
+		  }
 		else  
 		  break;
 	      }
 	    
-	    if (new->flags & CONTEXT_DHCP)
-	      {
-		new->next = daemon->dhcp6;
-		daemon->dhcp6 = new;
-	      }
-	    else
-	      {
-		new->next = daemon->ra_contexts;
-		daemon->ra_contexts = new;
-	      }
-	     
+	    new->next = daemon->dhcp6;
+	    daemon->dhcp6 = new;
+	    	     
 	    /* bare integer < 128 is prefix value */
 	    if (leasepos < k)
 	      {
@@ -2317,10 +2314,14 @@ static int one_opt(int option, char *arg, char *errstr, char *gen_err, int comma
 		  {
 		    new->prefix = pref;
 		    leasepos++;
-		    if ((new->flags & (CONTEXT_RA_ONLY | CONTEXT_RA_NAME | CONTEXT_RA_STATELESS)) && 
-			new->prefix != 64)
-		      ret_err(_("prefix must be exactly 64 for RA subnets"));
-		    else if (new->prefix < 64)
+		    if (new->prefix != 64)
+		      {
+			if ((new->flags & (CONTEXT_RA_ONLY | CONTEXT_RA_NAME | CONTEXT_RA_STATELESS)))
+			  ret_err(_("prefix must be exactly 64 for RA subnets"));
+			else if (new->template_interface)
+			  ret_err(_("prefix must be exactly 64 for subnet constructors"));
+		      }
+		    if (new->prefix < 64)
 		      ret_err(_("prefix must be at least 64"));
 		  }
 	      }
diff --git a/src/radv.c b/src/radv.c
index 54884a2..b74c398 100644
--- a/src/radv.c
+++ b/src/radv.c
@@ -27,6 +27,7 @@
 #include <netinet/icmp6.h>
 
 struct ra_param {
+  time_t now;
   int ind, managed, other, found_context, first;
   char *if_name;
   struct dhcp_netid *tags;
@@ -37,11 +38,13 @@ struct search_param {
   time_t now; int iface;
 };
 
-static void send_ra(int iface, char *iface_name, struct in6_addr *dest);
+static void send_ra(time_t now, int iface, char *iface_name, struct in6_addr *dest);
 static int add_prefixes(struct in6_addr *local,  int prefix,
-			int scope, int if_index, int dad, void *vparam);
+			int scope, int if_index, int dad, 
+			int preferred, int valid, void *vparam);
 static int iface_search(struct in6_addr *local,  int prefix,
-			int scope, int if_index, int dad, void *vparam);
+			int scope, int if_index, int dad, 
+			int prefered, int valid, void *vparam);
 static int add_lla(int index, unsigned int type, char *mac, size_t maclen, void *parm);
 
 static int hop_limit;
@@ -62,7 +65,7 @@ void ra_init(time_t now)
   expand_buf(&daemon->outpacket, sizeof(struct dhcp_packet));
  
   /* See if we're guessing SLAAC addresses, if so we need to recieve ping replies */
-  for (context = daemon->ra_contexts; context; context = context->next)
+  for (context = daemon->dhcp6; context; context = context->next)
     if ((context->flags & CONTEXT_RA_NAME))
       break;
   
@@ -98,14 +101,17 @@ void ra_start_unsolicted(time_t now, struct dhcp_context *context)
   if (context)
      context->ra_time = now;
   else
-    for (context = daemon->ra_contexts; context; context = context->next)
-      context->ra_time = now + (rand16()/13000); /* range 0 - 5 */
-
+    for (context = daemon->dhcp6; context; context = context->next)
+      if (context->flags & CONTEXT_RA)
+	context->ra_time = now + (rand16()/13000); /* range 0 - 5 */
+      else
+	context->ra_time = 0;
+  
    /* re-do frequently for a minute or so, in case the first gets lost. */
    ra_short_period_start = now;
 }
 
-void icmp6_packet(void)
+void icmp6_packet(time_t now)
 {
   char interface[IF_NAMESIZE+1];
   ssize_t sz; 
@@ -174,11 +180,11 @@ void icmp6_packet(void)
          
       my_syslog(MS_DHCP | LOG_INFO, "RTR-SOLICIT(%s) %s", interface, mac);
       /* source address may not be valid in solicit request. */
-      send_ra(if_index, interface, !IN6_IS_ADDR_UNSPECIFIED(&from.sin6_addr) ? &from.sin6_addr : NULL);
+      send_ra(now, if_index, interface, !IN6_IS_ADDR_UNSPECIFIED(&from.sin6_addr) ? &from.sin6_addr : NULL);
     }
 }
 
-static void send_ra(int iface, char *iface_name, struct in6_addr *dest)
+static void send_ra(time_t now, int iface, char *iface_name, struct in6_addr *dest)
 {
   struct ra_packet *ra;
   struct ra_param parm;
@@ -206,13 +212,14 @@ static void send_ra(int iface, char *iface_name, struct in6_addr *dest)
   parm.found_context = 0;
   parm.if_name = iface_name;
   parm.first = 1;
-
+  parm.now = now;
+  
   /* set tag with name == interface */
   iface_id.net = iface_name;
   iface_id.next = NULL;
   parm.tags = &iface_id; 
   
-  for (context = daemon->ra_contexts; context; context = context->next)
+  for (context = daemon->dhcp6; context; context = context->next)
     {
       context->flags &= ~CONTEXT_RA_DONE;
       context->netid.next = &context->netid;
@@ -320,28 +327,32 @@ static void send_ra(int iface, char *iface_name, struct in6_addr *dest)
 }
 
 static int add_prefixes(struct in6_addr *local,  int prefix,
-			int scope, int if_index, int dad, void *vparam)
+			int scope, int if_index, int dad, 
+			int preferred, int valid, void *vparam)
 {
   struct ra_param *param = vparam;
 
   (void)scope; /* warning */
   (void)dad;
+  (void)preferred;
+  (void)valid;
 
   if (if_index == param->ind)
     {
       if (IN6_IS_ADDR_LINKLOCAL(local))
 	param->link_local = *local;
       else if (!IN6_IS_ADDR_LOOPBACK(local) &&
-	       !IN6_IS_ADDR_LINKLOCAL(local) &&
 	       !IN6_IS_ADDR_MULTICAST(local))
 	{
 	  int do_prefix = 0;
 	  int do_slaac = 0;
 	  int deprecate  = 0;
+	  int found_constructed = 0;
 	  unsigned int time = 0xffffffff;
+	  int calc_valid = 0, calc_preferred = 0;
 	  struct dhcp_context *context;
 	  
-	  for (context = daemon->ra_contexts; context; context = context->next)
+	  for (context = daemon->dhcp6; context; context = context->next)
 	    if (prefix == context->prefix &&
 		is_same_net6(local, &context->start6, prefix) &&
 		is_same_net6(local, &context->end6, prefix))
@@ -365,7 +376,18 @@ static int add_prefixes(struct in6_addr *local,  int prefix,
 		    param->managed = 1;
 		    param->other = 1;
 		  }
-
+		
+		if (context->flags & CONTEXT_CONSTRUCTED)
+		  {
+		    found_constructed = 1;
+		    calc_valid = context->valid;
+		    calc_preferred = context->preferred;
+		    if (context->valid != -1)
+		      calc_valid -= (int)param->now;
+		    if (context->preferred != -1)
+		      calc_preferred -= (int)param->now;			
+		  }
+		
 		/* find floor time */
 		if (time > context->lease_time)
 		  time = context->lease_time;
@@ -395,6 +417,12 @@ static int add_prefixes(struct in6_addr *local,  int prefix,
 		param->first = 0;	
 		param->found_context = 1;
 	      }
+
+	  if (!found_constructed)
+	    {
+	      calc_valid = time;
+	      calc_preferred = deprecate ? 0 : time;
+	    }
 	  
 	  if (do_prefix)
 	    {
@@ -414,8 +442,8 @@ static int add_prefixes(struct in6_addr *local,  int prefix,
 		  opt->prefix_len = prefix;
 		  /* autonomous only if we're not doing dhcp, always set "on-link" */
 		  opt->flags = do_slaac ? 0xC0 : 0x80;
-		  opt->valid_lifetime = htonl(time);
-		  opt->preferred_lifetime = htonl(deprecate ? 0 : time);
+		  opt->valid_lifetime = htonl(calc_valid);
+		  opt->preferred_lifetime = htonl(calc_preferred);
 		  opt->reserved = 0; 
 		  opt->prefix = *local;
 		  
@@ -462,7 +490,7 @@ time_t periodic_ra(time_t now)
   while (1)
     {
       /* find overdue events, and time of first future event */
-      for (next_event = 0, context = daemon->ra_contexts; context; context = context->next)
+      for (next_event = 0, context = daemon->dhcp6; context; context = context->next)
 	if (context->ra_time != 0)
 	  {
 	    if (difftime(context->ra_time, now) <= 0.0)
@@ -492,22 +520,25 @@ time_t periodic_ra(time_t now)
 	    if (tmp->name && (strcmp(tmp->name, interface) == 0))
 	      break;
 	  if (!tmp)
-	    send_ra(param.iface, interface, NULL); 
+	    send_ra(now, param.iface, interface, NULL); 
 	}
     }      
   return next_event;
 }
   
 static int iface_search(struct in6_addr *local,  int prefix,
-			int scope, int if_index, int dad, void *vparam)
+			int scope, int if_index, int dad, 
+			int preferred, int valid, void *vparam)
 {
   struct search_param *param = vparam;
   struct dhcp_context *context;
 
   (void)scope;
   (void)dad;
+  (void)preferred;
+  (void)valid;
  
-  for (context = daemon->ra_contexts; context; context = context->next)
+  for (context = daemon->dhcp6; context; context = context->next)
     if (prefix == context->prefix &&
 	is_same_net6(local, &context->start6, prefix) &&
 	is_same_net6(local, &context->end6, prefix))
diff --git a/src/slaac.c b/src/slaac.c
index 7713ac4..f959c72 100644
--- a/src/slaac.c
+++ b/src/slaac.c
@@ -20,7 +20,6 @@
 
 #include <netinet/icmp6.h>
 
-static int map_rebuild = 0;
 static int ping_id = 0;
 
 void slaac_add_addrs(struct dhcp_lease *lease, time_t now, int force)
@@ -38,7 +37,7 @@ void slaac_add_addrs(struct dhcp_lease *lease, time_t now, int force)
   old = lease->slaac_address;
   lease->slaac_address = NULL;
 
-  for (context = daemon->ra_contexts; context; context = context->next) 
+  for (context = daemon->dhcp6; context; context = context->next) 
     if ((context->flags & CONTEXT_RA_NAME) && lease->last_interface == context->if_index)
       {
 	struct in6_addr addr = context->start6;
@@ -123,7 +122,7 @@ time_t periodic_slaac(time_t now, struct dhcp_lease *leases)
   struct slaac_address *slaac;
   time_t next_event = 0;
   
-  for (context = daemon->ra_contexts; context; context = context->next)
+  for (context = daemon->dhcp6; context; context = context->next)
     if ((context->flags & CONTEXT_RA_NAME))
       break;
 
@@ -134,12 +133,6 @@ time_t periodic_slaac(time_t now, struct dhcp_lease *leases)
   while (ping_id == 0)
     ping_id = rand16();
 
-  if (map_rebuild)
-    {
-      map_rebuild = 0;
-      build_subnet_map();
-    }
-
   for (lease = leases; lease; lease = lease->next)
     for (slaac = lease->slaac_address; slaac; slaac = slaac->next)
       {
@@ -211,51 +204,4 @@ void slaac_ping_reply(struct in6_addr *sender, unsigned char *packet, char *inte
   lease_update_dns(gotone);
 }
 	
-/* Build a map from ra-names subnets to corresponding interfaces. This
-   is used to go from DHCPv4 leases to SLAAC addresses, 
-   interface->IPv6-subnet, IPv6-subnet + MAC address -> SLAAC.
-*/	      
-static int add_subnet(struct in6_addr *local,  int prefix,
-		      int scope, int if_index, int dad, void *vparam)
-{ 
-  struct dhcp_context *context;
- 
-  (void)scope;
-  (void)dad;
-  (void)vparam;
-
-  for (context = daemon->ra_contexts; context; context = context->next)
-    if ((context->flags & CONTEXT_RA_NAME) &&
-	prefix == context->prefix &&
-	is_same_net6(local, &context->start6, prefix) &&
-	is_same_net6(local, &context->end6, prefix))
-      {
-	context->if_index = if_index;
-	context->local6 = *local;
-      }
-
-  return 1;
-}
-
-void build_subnet_map(void)
-{
-  struct dhcp_context *context;
-  int ok = 0;
-
-  for (context = daemon->ra_contexts; context; context = context->next)
-    {
-      context->if_index = 0;
-      if ((context->flags & CONTEXT_RA_NAME))
-	ok = 1;
-    }
-
-  /* ra-names configured */
-  if (ok)
-    iface_enumerate(AF_INET6, NULL, add_subnet);
-}
-
-void schedule_subnet_map(void)
-{
-  map_rebuild = 1; 
-}
 #endif