diff --git a/conf/confbase.Y b/conf/confbase.Y
index 64a636cf..3ad0c5f0 100644
--- a/conf/confbase.Y
+++ b/conf/confbase.Y
@@ -41,6 +41,8 @@ CF_DECLS
   ip_addr a;
   ip4_addr ip4;
   ip6_addr ip6;
+  net_addr_union net;
+  net_addr *net_ptr;
   struct symbol *s;
   char *t;
   struct rtable_config *r;
@@ -78,10 +80,11 @@ CF_DECLS
 %type <i32> expr_us
 %type <time> datetime
 %type <a> ipa ipa_raw
-%type <px> prefix prefix_or_ipa
-%type <t> text
-%type <t> text_or_none
-%type <t> opttext
+%type <px> prefix
+%type <net> net_ip4 net_ip6 net_ip net_or_ipa
+%type <net_ptr> net_any
+
+%type <t> text opttext
 
 %nonassoc PREFIX_DUMMY
 %left AND OR
@@ -169,6 +172,25 @@ ipa_scope:
  | '%' SYM { $$ = if_get_by_name($2->name); }
  ;
 
+
+/* XXXX - symbols and tests */
+
+net_ip4: IP4 pxlen { $$.ip4 = NET_ADDR_IP4($1, $2); }
+
+net_ip6: IP6 pxlen { $$.ip6 = NET_ADDR_IP6($1, $2); }
+
+net_ip: net_ip4 | net_ip6 ;
+
+net_any: net_ip { $$ = cfg_alloc($1.n.length); net_copy($$, &($1.n)); }
+
+net_or_ipa:
+   net_ip4
+ | net_ip6
+ | IP4 { $$.ip4 = NET_ADDR_IP4($1, IP4_MAX_PREFIX_LENGTH); }
+ | IP6 { $$.ip6 = NET_ADDR_IP6($1, IP6_MAX_PREFIX_LENGTH); }
+ ;
+
+
 prefix:
    ipa pxlen {
      if (!ip_is_prefix($1, $2)) cf_error("Invalid prefix");
@@ -176,11 +198,6 @@ prefix:
    }
  ;
 
-prefix_or_ipa:
-   prefix
- | ipa { $$.addr = $1; $$.len = BITS_PER_IP_ADDRESS; }
- ;
-
 pxlen:
    '/' expr {
      if ($2 < 0 || $2 > BITS_PER_IP_ADDRESS) cf_error("Invalid prefix length %d", $2);
@@ -208,11 +225,6 @@ text:
    }
  ;
 
-text_or_none:
-   TEXT { $$ = $1; }
- |      { $$ = NULL; }
- ;
-
 opttext:
     TEXT
  | /* empty */ { $$ = NULL; }
diff --git a/lib/net.h b/lib/net.h
index f6bf95f3..378703f7 100644
--- a/lib/net.h
+++ b/lib/net.h
@@ -24,8 +24,8 @@ typedef struct net_addr {
   u8 type;
   u8 pxlen;
   u16 length;
+  u8 data[16];
   u64 align[0];
-  u32 space[4];
 } net_addr;
 
 typedef struct net_addr_ip4 {
@@ -207,6 +207,9 @@ int net_classify(const net_addr *N);
 char * net_format(const net_addr *N, char *buf, int buflen);
 
 
+int ipa_in_netX(const ip_addr A, const net_addr *N);
+int net_in_netX(const net_addr *A, const net_addr *N);
+
 
 #endif
 
diff --git a/nest/config.Y b/nest/config.Y
index 4353db79..537a363c 100644
--- a/nest/config.Y
+++ b/nest/config.Y
@@ -30,7 +30,7 @@ iface_patt_check(void)
   struct iface_patt_node *pn;
 
   WALK_LIST(pn, this_ipatt->ipn_list)
-    if (!pn->pattern || pn->pxlen)
+    if (!pn->pattern || pn->prefix.pxlen) /* XXXX */
       cf_error("Interface name/mask expected, not IP prefix");
 }
 
@@ -284,9 +284,8 @@ iface_patt_node_init:
  ;
 
 iface_patt_node_body:
-   TEXT { this_ipn->pattern = $1; this_ipn->prefix = IPA_NONE; this_ipn->pxlen = 0; }
- | prefix_or_ipa { this_ipn->pattern = NULL; this_ipn->prefix = $1.addr; this_ipn->pxlen = $1.len; }
- | TEXT prefix_or_ipa { this_ipn->pattern = $1; this_ipn->prefix = $2.addr; this_ipn->pxlen = $2.len; }
+   TEXT { this_ipn->pattern = $1; net_fill_ip6(&this_ipn->prefix, IP6_NONE, 0); /* XXXX */ }
+ | opttext net_or_ipa { this_ipn->pattern = $1; this_ipn->prefix = $2.n; }
  ;
 
 iface_negate:
@@ -479,11 +478,11 @@ r_args:
      $$->prefix = $2.addr;
      $$->pxlen = $2.len;
    }
- | r_args FOR prefix_or_ipa {
+ | r_args FOR net_or_ipa {
      $$ = $1;
      if ($$->pxlen != 256) cf_error("Only one prefix expected");
-     $$->prefix = $3.addr;
-     $$->pxlen = $3.len;
+     $$->prefix = IPA_NONE; /* XXXX */
+     $$->pxlen = 0; /* XXXX */
      $$->show_for = 1;
    }
  | r_args TABLE SYM {
diff --git a/nest/iface.c b/nest/iface.c
index 4d73c2a4..5d3c0e60 100644
--- a/nest/iface.c
+++ b/nest/iface.c
@@ -46,7 +46,7 @@ list iface_list;
 void
 ifa_dump(struct ifa *a)
 {
-  debug("\t%I, net %I/%-2d bc %I -> %I%s%s%s\n", a->ip, a->prefix, a->pxlen, a->brd, a->opposite,
+  debug("\t%I, net %N bc %I -> %I%s%s%s\n", a->ip, &a->prefix, a->brd, a->opposite,
 	(a->flags & IF_UP) ? "" : " DOWN",
 	(a->flags & IA_PRIMARY) ? "" : " SEC",
 	(a->flags & IA_PEER) ? "PEER" : "");
@@ -141,10 +141,9 @@ ifa_send_notify(struct proto *p, unsigned c, struct ifa *a)
   if (p->ifa_notify)
     {
       if (p->debug & D_IFACES)
-	log(L_TRACE "%s < %s address %I/%d on interface %s %s",
+	log(L_TRACE "%s < %s address %N on interface %s %s",
 	    p->name, (a->flags & IA_PRIMARY) ? "primary" : "secondary",
-	    a->prefix, a->pxlen, a->iface->name,
-	    (c & IF_CHANGE_UP) ? "added" : "removed");
+	    &a->prefix, a->iface->name, (c & IF_CHANGE_UP) ? "added" : "removed");
       p->ifa_notify(p, c, a);
     }
 }
@@ -500,8 +499,7 @@ ifa_recalc_all_primary_addresses(void)
 static inline int
 ifa_same(struct ifa *a, struct ifa *b)
 {
-  return ipa_equal(a->ip, b->ip) && ipa_equal(a->prefix, b->prefix) &&
-    a->pxlen == b->pxlen;
+  return ipa_equal(a->ip, b->ip) && net_equal(&a->prefix, &b->prefix);
 }
 
 
@@ -586,7 +584,6 @@ ifa_delete(struct ifa *a)
 u32
 if_choose_router_id(struct iface_patt *mask, u32 old_id)
 {
-#ifndef IPV6
   struct iface *i;
   struct ifa *a, *b;
 
@@ -599,6 +596,9 @@ if_choose_router_id(struct iface_patt *mask, u32 old_id)
 
       WALK_LIST(a, i->addrs)
 	{
+	  if (a->prefix.type != NET_IP4)
+	    continue;
+
 	  if (a->flags & IA_SECONDARY)
 	    continue;
 
@@ -623,10 +623,6 @@ if_choose_router_id(struct iface_patt *mask, u32 old_id)
     log(L_INFO "Chosen router ID %R according to interface %s", id, b->iface->name);
 
   return id;
-
-#else
-  return 0;
-#endif
 }
 
 /**
@@ -669,17 +665,17 @@ iface_patt_match(struct iface_patt *ifp, struct iface *i, struct ifa *a)
 	    continue;
 	}
 
-      if (p->pxlen == 0)
+      if (p->prefix.pxlen == 0)
 	return pos;
 
       if (!a)
 	continue;
 
-      if (ipa_in_net(a->ip, p->prefix, p->pxlen))
+      if (ipa_in_netX(a->ip, &p->prefix))
 	return pos;
 
       if ((a->flags & IA_PEER) &&
-	  ipa_in_net(a->opposite, p->prefix, p->pxlen))
+	  ipa_in_netX(a->opposite, &p->prefix))
 	return pos;
 
       continue;
@@ -713,8 +709,7 @@ iface_plists_equal(struct iface_patt *pa, struct iface_patt *pb)
 	  (!x->pattern && y->pattern) ||	/* This nasty lines where written by me... :-( Feela */
 	  (!y->pattern && x->pattern) ||
 	  ((x->pattern != y->pattern) && strcmp(x->pattern, y->pattern)) ||
-	  !ipa_equal(x->prefix, y->prefix) ||
-	  (x->pxlen != y->pxlen))
+	  !net_equal(&x->prefix, &y->prefix))
 	return 0;
       x = (void *) x->n.next;
       y = (void *) y->n.next;
@@ -754,7 +749,7 @@ if_show_addr(struct ifa *a)
   else
     opp[0] = 0;
   cli_msg(-1003, "\t%I/%d (%s%s, scope %s)",
-	  a->ip, a->pxlen,
+	  a->ip, a->prefix.pxlen,
 	  (a->flags & IA_PRIMARY) ? "Primary" : (a->flags & IA_SECONDARY) ? "Secondary" : "Unselected",
 	  opp, ip_scope_text(a->scope));
 }
@@ -804,7 +799,7 @@ if_show_summary(void)
   WALK_LIST(i, iface_list)
     {
       if (i->addr)
-	bsprintf(addr, "%I/%d", i->addr->ip, i->addr->pxlen);
+	bsprintf(addr, "%I/%d", i->addr->ip, i->addr->prefix.pxlen);
       else
 	addr[0] = 0;
       cli_msg(-1005, "%-9s %-5s %s", i->name, (i->flags & IF_UP) ? "up" : "DOWN", addr);
diff --git a/nest/iface.h b/nest/iface.h
index 56710e4a..c4f414ec 100644
--- a/nest/iface.h
+++ b/nest/iface.h
@@ -19,9 +19,8 @@ struct pool;
 struct ifa {				/* Interface address */
   node n;
   struct iface *iface;			/* Interface this address belongs to */
+  net_addr prefix;			/* Network prefix */
   ip_addr ip;				/* IP address of this host */
-  ip_addr prefix;			/* Network prefix */
-  unsigned pxlen;			/* Prefix length */
   ip_addr brd;				/* Broadcast address */
   ip_addr opposite;			/* Opposite end of a point-to-point link */
   unsigned scope;			/* Interface address scope */
@@ -148,8 +147,7 @@ struct iface_patt_node {
   node n;
   int positive;
   byte *pattern;
-  ip_addr prefix;
-  int pxlen;
+  net_addr prefix;
 };
 
 struct iface_patt {
diff --git a/nest/neighbor.c b/nest/neighbor.c
index 1685d67e..b8832f2f 100644
--- a/nest/neighbor.c
+++ b/nest/neighbor.c
@@ -79,7 +79,7 @@ if_connected(ip_addr *a, struct iface *i, struct ifa **ap)
 	}
       else
 	{
-	  if (ipa_in_net(*a, b->prefix, b->pxlen))
+	  if (ipa_in_netX(*a, &b->prefix))
 	    {
 #ifndef IPV6
 	      if ((b->pxlen < (BITS_PER_IP_ADDRESS - 1)) &&
diff --git a/nest/rt-dev.c b/nest/rt-dev.c
index e8408116..f94933d5 100644
--- a/nest/rt-dev.c
+++ b/nest/rt-dev.c
@@ -45,7 +45,7 @@ dev_ifa_notify(struct proto *p, unsigned c, struct ifa *ad)
       net *n;
 
       DBG("dev_if_notify: %s:%I going down\n", ad->iface->name, ad->ip);
-      n = net_find_ipa(p->table, ad->prefix, ad->pxlen);
+      n = net_find(p->table, &ad->prefix);
       if (!n)
 	{
 	  DBG("dev_if_notify: device shutdown: prefix not found\n");
@@ -77,7 +77,7 @@ dev_ifa_notify(struct proto *p, unsigned c, struct ifa *ad)
       };
 
       a = rta_lookup(&a0);
-      n = net_get_ipa(p->table, ad->prefix, ad->pxlen);
+      n = net_get(p->table, &ad->prefix);
       e = rte_get_temp(a);
       e->net = n;
       e->pflags = 0;
diff --git a/proto/ospf/config.Y b/proto/ospf/config.Y
index 706ab7ac..e8fb7f2e 100644
--- a/proto/ospf/config.Y
+++ b/proto/ospf/config.Y
@@ -211,10 +211,10 @@ ospf_stubnet:
  ;
 
 ospf_stubnet_start:
-   prefix {
+   net_ip {
      this_stubnet = cfg_allocz(sizeof(struct ospf_stubnet_config));
      add_tail(&this_area->stubnet_list, NODE this_stubnet);
-     this_stubnet->px = $1;
+     this_stubnet->prefix = $1.n;
      this_stubnet->cost = COST_D;
    }
  ;
@@ -321,12 +321,11 @@ pref_list:
 
 pref_item: pref_base pref_opt ';' ;
 
-pref_base: prefix
+pref_base: net_ip
  {
    this_pref = cfg_allocz(sizeof(struct area_net_config));
    add_tail(this_nets, NODE this_pref);
-   this_pref->px.addr = $1.addr;
-   this_pref->px.len = $1.len;
+   this_pref->prefix = $1.n;
  }
 ;
 
diff --git a/proto/ospf/hello.c b/proto/ospf/hello.c
index 8b550e71..3fbb6167 100644
--- a/proto/ospf/hello.c
+++ b/proto/ospf/hello.c
@@ -74,7 +74,7 @@ ospf_send_hello(struct ospf_iface *ifa, int kind, struct ospf_neighbor *dirn)
 	((ifa->type == OSPF_IT_PTP) && !ifa->ptp_netmask))
       ps->netmask = 0;
     else
-      ps->netmask = htonl(u32_mkmask(ifa->addr->pxlen));
+      ps->netmask = htonl(u32_mkmask(ifa->addr->prefix.pxlen));
 
     ps->helloint = ntohs(ifa->helloint);
     ps->options = ifa->oa->options;
@@ -198,7 +198,7 @@ ospf_receive_hello(struct ospf_packet *pkt, struct ospf_iface *ifa,
   /* RFC 2328 10.5 */
 
   /*
-   * We may not yet havethe associate neighbor, so we use Router ID from the
+   * We may not yet have the associate neighbor, so we use Router ID from the
    * packet instead of one from the neighbor structure for log messages.
    */
   u32 rcv_rid = ntohl(pkt->routerid);
@@ -224,7 +224,7 @@ ospf_receive_hello(struct ospf_packet *pkt, struct ospf_iface *ifa,
     int pxlen = u32_masklen(ntohl(ps->netmask));
     if ((ifa->type != OSPF_IT_VLINK) &&
 	(ifa->type != OSPF_IT_PTP) &&
-	(pxlen != ifa->addr->pxlen))
+	(pxlen != ifa->addr->prefix.pxlen))
       DROP("prefix length mismatch", pxlen);
 
     neighbors = ps->neighbors;
diff --git a/proto/ospf/iface.c b/proto/ospf/iface.c
index 3c0cee18..5d37b005 100644
--- a/proto/ospf/iface.c
+++ b/proto/ospf/iface.c
@@ -237,8 +237,8 @@ ospf_iface_down(struct ospf_iface *ifa)
       OSPF_TRACE(D_EVENTS, "Removing interface %s (peer %I) from area %R",
 		 ifa->ifname, ifa->addr->opposite, ifa->oa->areaid);
     else
-      OSPF_TRACE(D_EVENTS, "Removing interface %s (%I/%d) from area %R",
-		 ifa->ifname, ifa->addr->prefix, ifa->addr->pxlen, ifa->oa->areaid);
+      OSPF_TRACE(D_EVENTS, "Removing interface %s (%N) from area %R",
+		 ifa->ifname, &ifa->addr->prefix, ifa->oa->areaid);
 
     /* First of all kill all the related vlinks */
     WALK_LIST(iff, p->iface_list)
@@ -550,8 +550,8 @@ ospf_iface_new(struct ospf_area *oa, struct ifa *addr, struct ospf_iface_patt *i
     OSPF_TRACE(D_EVENTS, "Adding interface %s (peer %I) to area %R",
 	       iface->name, addr->opposite, oa->areaid);
   else
-    OSPF_TRACE(D_EVENTS, "Adding interface %s (%I/%d) to area %R",
-	       iface->name, addr->prefix, addr->pxlen, oa->areaid);
+    OSPF_TRACE(D_EVENTS, "Adding interface %s (%N) to area %R",
+	       iface->name, &addr->prefix, oa->areaid);
 
   pool = rp_new(p->p.pool, "OSPF Interface");
   ifa = mb_allocz(pool, sizeof(struct ospf_iface));
@@ -627,7 +627,7 @@ ospf_iface_new(struct ospf_area *oa, struct ifa *addr, struct ospf_iface_patt *i
        should be used). Because OSPFv3 iface is not subnet-specific,
        there is no need for ipa_in_net() check */
 
-    if (ospf_is_v2(p) && !ipa_in_net(nb->ip, addr->prefix, addr->pxlen))
+    if (ospf_is_v2(p) && !ipa_in_netX(nb->ip, &addr->prefix))
       continue;
 
     if (ospf_is_v3(p) && !ipa_is_link_local(nb->ip))
@@ -640,7 +640,7 @@ ospf_iface_new(struct ospf_area *oa, struct ifa *addr, struct ospf_iface_patt *i
   add_tail(&oa->po->iface_list, NODE ifa);
 
   struct object_lock *lock = olock_new(pool);
-  lock->addr = ospf_is_v2(p) ? ifa->addr->prefix : IPA_NONE;
+  lock->addr = ospf_is_v2(p) ? ipa_from_ip4(net4_prefix(&ifa->addr->prefix)) : IPA_NONE;
   lock->type = OBJLOCK_IP;
   lock->port = OSPF_PROTO;
   lock->inst = ifa->instance_id;
@@ -886,7 +886,7 @@ ospf_iface_reconfigure(struct ospf_iface *ifa, struct ospf_iface_patt *new)
   WALK_LIST(nb, new->nbma_list)
   {
     /* See related note in ospf_iface_new() */
-    if (ospf_is_v2(p) && !ipa_in_net(nb->ip, ifa->addr->prefix, ifa->addr->pxlen))
+    if (ospf_is_v2(p) && !ipa_in_netX(nb->ip, &ifa->addr->prefix))
       continue;
 
     if (ospf_is_v3(p) && !ipa_is_link_local(nb->ip))
@@ -1073,6 +1073,9 @@ ospf_ifa_notify2(struct proto *P, uint flags, struct ifa *a)
 {
   struct ospf_proto *p = (struct ospf_proto *) P;
 
+  if (a->prefix.type != NET_IP4)
+    return;
+
   if (a->flags & IA_SECONDARY)
     return;
 
@@ -1102,6 +1105,9 @@ ospf_ifa_notify3(struct proto *P, uint flags, struct ifa *a)
 {
   struct ospf_proto *p = (struct ospf_proto *) P;
 
+  if (a->prefix.type != NET_IP6)
+    return;
+
   if (a->flags & IA_SECONDARY)
     return;
 
@@ -1154,6 +1160,9 @@ ospf_reconfigure_ifaces2(struct ospf_proto *p)
 
     WALK_LIST(a, iface->addrs)
     {
+      if (a->prefix.type != NET_IP4)
+	continue;
+
       if (a->flags & IA_SECONDARY)
 	continue;
 
@@ -1172,8 +1181,8 @@ ospf_reconfigure_ifaces2(struct ospf_proto *p)
 	    continue;
 
 	  /* Hard restart */
-	  log(L_INFO "%s: Restarting interface %s (%I/%d) in area %R",
-	      p->p.name, ifa->ifname, a->prefix, a->pxlen, s.oa->areaid);
+	  log(L_INFO "%s: Restarting interface %s (%N) in area %R",
+	      p->p.name, ifa->ifname, &a->prefix, s.oa->areaid);
 	  ospf_iface_shutdown(ifa);
 	  ospf_iface_remove(ifa);
 	}
@@ -1197,6 +1206,9 @@ ospf_reconfigure_ifaces3(struct ospf_proto *p)
 
     WALK_LIST(a, iface->addrs)
     {
+      if (a->prefix.type != NET_IP6)
+	continue;
+
       if (a->flags & IA_SECONDARY)
 	continue;
 
@@ -1328,7 +1340,7 @@ ospf_iface_info(struct ospf_iface *ifa)
     else if (ifa->addr->flags & IA_PEER)
       cli_msg(-1015, "Interface %s (peer %I)", ifa->ifname, ifa->addr->opposite);
     else
-      cli_msg(-1015, "Interface %s (%I/%d)", ifa->ifname, ifa->addr->prefix, ifa->addr->pxlen);
+      cli_msg(-1015, "Interface %s (%N)", ifa->ifname, ifa->addr->prefix);
 
     cli_msg(-1015, "\tType: %s%s", ospf_it[ifa->type], more);
     cli_msg(-1015, "\tArea: %R (%u)", ifa->oa->areaid, ifa->oa->areaid);
diff --git a/proto/ospf/ospf.c b/proto/ospf/ospf.c
index bfe51e66..cdc62d0a 100644
--- a/proto/ospf/ospf.c
+++ b/proto/ospf/ospf.c
@@ -114,7 +114,6 @@ add_area_nets(struct ospf_area *oa, struct ospf_area_config *ac)
   struct ospf_proto *p = oa->po;
   struct area_net_config *anc;
   struct area_net *an;
-  net_addr net;
 
   fib_init(&oa->net_fib,  p->p.pool, ospf_is_v2(p) ? NET_IP4 : NET_IP6,
 	   sizeof(struct area_net), OFFSETOF(struct area_net, fn), 0, NULL);
@@ -123,17 +122,13 @@ add_area_nets(struct ospf_area *oa, struct ospf_area_config *ac)
 
   WALK_LIST(anc, ac->net_list)
   {
-    /* XXXX we should dispatch by ospf version, not by px.addr */
-    net_fill_ipa(&net, anc->px.addr, anc->px.len);
-    an = fib_get(&oa->net_fib, &net);
+    an = fib_get(&oa->net_fib, &anc->prefix);
     an->hidden = anc->hidden;
   }
 
   WALK_LIST(anc, ac->enet_list)
   {
-    /* XXXX ditto */
-    net_fill_ipa(&net, anc->px.addr, anc->px.len);
-    an = fib_get(&oa->enet_fib, &net);
+    an = fib_get(&oa->enet_fib, &anc->prefix);
     an->hidden = anc->hidden;
     an->tag = anc->tag;
   }
diff --git a/proto/ospf/ospf.h b/proto/ospf/ospf.h
index df77dda9..6291ae1a 100644
--- a/proto/ospf/ospf.h
+++ b/proto/ospf/ospf.h
@@ -125,7 +125,7 @@ struct ospf_area_config
 struct area_net_config
 {
   node n;
-  struct prefix px;
+  net_addr prefix;
   u32 tag;
   u8 hidden;
 };
@@ -142,7 +142,7 @@ struct area_net
 struct ospf_stubnet_config
 {
   node n;
-  struct prefix px;
+  net_addr prefix;
   u32 cost;
   u8 hidden;
   u8 summary;
diff --git a/proto/ospf/packet.c b/proto/ospf/packet.c
index 606127f2..0975b251 100644
--- a/proto/ospf/packet.c
+++ b/proto/ospf/packet.c
@@ -236,7 +236,7 @@ ospf_rx_hook(sock *sk, int len)
     return 1;
 
   int src_local, dst_local, dst_mcast;
-  src_local = ipa_in_net(sk->faddr, ifa->addr->prefix, ifa->addr->pxlen);
+  src_local = ipa_in_netX(sk->faddr, &ifa->addr->prefix);
   dst_local = ipa_equal(sk->laddr, ifa->addr->ip);
   dst_mcast = ipa_equal(sk->laddr, ifa->all_routers) || ipa_equal(sk->laddr, ifa->des_routers);
 
diff --git a/proto/ospf/topology.c b/proto/ospf/topology.c
index 47832771..59e76019 100644
--- a/proto/ospf/topology.c
+++ b/proto/ospf/topology.c
@@ -629,12 +629,12 @@ configured_stubnet(struct ospf_area *oa, struct ifa *a)
   {
     if (sn->summary)
     {
-      if (ipa_in_net(a->prefix, sn->px.addr, sn->px.len) && (a->pxlen >= sn->px.len))
+      if (net_in_netX(&a->prefix, &sn->prefix))
 	return 1;
     }
     else
     {
-      if (ipa_equal(a->prefix, sn->px.addr) && (a->pxlen == sn->px.len))
+      if (net_equal(&a->prefix, &sn->prefix))
 	return 1;
     }
   }
@@ -782,7 +782,8 @@ prepare_rt2_lsa_body(struct ospf_proto *p, struct ospf_area *oa)
 	(ifa->type == OSPF_IT_PTMP))
       add_rt2_lsa_link(p, LSART_STUB, ipa_to_u32(ifa->addr->ip), 0xffffffff, 0);
     else
-      add_rt2_lsa_link(p, LSART_STUB, ipa_to_u32(ifa->addr->prefix), u32_mkmask(ifa->addr->pxlen), ifa->cost);
+      add_rt2_lsa_link(p, LSART_STUB, ip4_to_u32(net4_prefix(&ifa->addr->prefix)),
+		       u32_mkmask(net4_pxlen(&ifa->addr->prefix)), ifa->cost);
     i++;
 
     ifa->rt_pos_end = i;
@@ -791,7 +792,8 @@ prepare_rt2_lsa_body(struct ospf_proto *p, struct ospf_area *oa)
   struct ospf_stubnet_config *sn;
   WALK_LIST(sn, oa->ac->stubnet_list)
     if (!sn->hidden)
-      add_rt2_lsa_link(p, LSART_STUB, ipa_to_u32(sn->px.addr), u32_mkmask(sn->px.len), sn->cost), i++;
+      add_rt2_lsa_link(p, LSART_STUB, ip4_to_u32(net4_prefix(&sn->prefix)),
+		       u32_mkmask(net4_pxlen(&sn->prefix)), sn->cost), i++;
 
   struct ospf_lsa_rt *rt = p->lsab;
   /* Store number of links in lower half of options */
@@ -908,7 +910,7 @@ prepare_net2_lsa_body(struct ospf_proto *p, struct ospf_iface *ifa)
   ASSERT(p->lsab_used == 0);
   net = lsab_alloc(p, sizeof(struct ospf_lsa_net) + 4 * nodes);
 
-  net->optx = u32_mkmask(ifa->addr->pxlen);
+  net->optx = u32_mkmask(ifa->addr->prefix.pxlen);
   net->routers[0] = p->router_id;
 
   WALK_LIST(n, ifa->neigh_list)
@@ -1179,7 +1181,7 @@ use_gw_for_fwaddr(struct ospf_proto *p, ip_addr gw, struct iface *iface)
 
   WALK_LIST(ifa, p->iface_list)
     if ((ifa->iface == iface) &&
-	(!ospf_is_v2(p) || ipa_in_net(gw, ifa->addr->prefix, ifa->addr->pxlen)))
+	(!ospf_is_v2(p) || ipa_in_netX(gw, &ifa->addr->prefix)))
       return 1;
 
   return 0;
@@ -1217,7 +1219,8 @@ find_surrogate_fwaddr(struct ospf_proto *p, struct ospf_area *oa)
     {
       WALK_LIST(a, ifa->iface->addrs)
       {
-	if ((a->flags & IA_SECONDARY) ||
+	if ((a->prefix.type != NET_IP6) ||
+	    (a->flags & IA_SECONDARY) ||
 	    (a->flags & IA_PEER) ||
 	    (a->scope <= SCOPE_LINK))
 	  continue;
@@ -1310,12 +1313,11 @@ ospf_rt_notify(struct proto *P, rtable *tbl UNUSED, net *n, rte *new, rte *old U
  */
 
 static inline void
-lsab_put_prefix(struct ospf_proto *p, ip6_addr prefix, u32 pxlen, u32 cost)
+lsab_put_prefix(struct ospf_proto *p, net_addr *net, u32 cost)
 {
-  net_addr_ip6 net = NET_ADDR_IP6(prefix, pxlen);
-  void *buf = lsab_alloc(p, IPV6_PREFIX_SPACE(pxlen));
-  u8 flags = (pxlen < IP6_MAX_PREFIX_LENGTH) ? 0 : OPT_PX_LA;
-  ospf_put_ipv6_prefix(buf, (net_addr *) &net, flags, cost);
+  void *buf = lsab_alloc(p, IPV6_PREFIX_SPACE(net6_pxlen(net)));
+  u8 flags = (net6_pxlen(net) < IP6_MAX_PREFIX_LENGTH) ? 0 : OPT_PX_LA;
+  ospf_put_ipv6_prefix(buf, net, flags, cost);
 }
 
 static void
@@ -1333,11 +1335,12 @@ prepare_link_lsa_body(struct ospf_proto *p, struct ospf_iface *ifa)
   struct ifa *a;
   WALK_LIST(a, ifa->iface->addrs)
   {
-    if ((a->flags & IA_SECONDARY) ||
-	(a->scope < SCOPE_SITE))
+    if ((a->prefix.type != NET_IP6) ||
+	(a->flags & IA_SECONDARY) ||
+	(a->scope <= SCOPE_LINK))
       continue;
 
-    lsab_put_prefix(p, a->prefix, a->pxlen, 0);
+    lsab_put_prefix(p, &a->prefix, 0);
     i++;
   }
 
@@ -1404,12 +1407,13 @@ prepare_prefix_rt_lsa_body(struct ospf_proto *p, struct ospf_area *oa)
     struct ifa *a;
     WALK_LIST(a, ifa->iface->addrs)
     {
-      if ((a->flags & IA_SECONDARY) ||
+      if ((a->prefix.type != NET_IP6) ||
+	  (a->flags & IA_SECONDARY) ||
 	  (a->flags & IA_PEER) ||
 	  (a->scope <= SCOPE_LINK))
 	continue;
 
-      if (((a->pxlen < IP6_MAX_PREFIX_LENGTH) && net_lsa) ||
+      if (((a->prefix.pxlen < IP6_MAX_PREFIX_LENGTH) && net_lsa) ||
 	  configured_stubnet(oa, a))
 	continue;
 
@@ -1417,11 +1421,12 @@ prepare_prefix_rt_lsa_body(struct ospf_proto *p, struct ospf_area *oa)
 	  (ifa->state == OSPF_IS_LOOP) ||
 	  (ifa->type == OSPF_IT_PTMP))
       {
-	lsab_put_prefix(p, a->ip, IP6_MAX_PREFIX_LENGTH, 0);
+	net_addr_ip6 net = NET_ADDR_IP6(a->ip, IP6_MAX_PREFIX_LENGTH);
+	lsab_put_prefix(p, (net_addr *) &net, 0);
 	host_addr = 1;
       }
       else
-	lsab_put_prefix(p, a->prefix, a->pxlen, ifa->cost);
+	lsab_put_prefix(p, &a->prefix, ifa->cost);
       i++;
     }
 
@@ -1432,8 +1437,8 @@ prepare_prefix_rt_lsa_body(struct ospf_proto *p, struct ospf_area *oa)
   WALK_LIST(sn, oa->ac->stubnet_list)
     if (!sn->hidden)
     {
-      lsab_put_prefix(p, sn->px.addr, sn->px.len, sn->cost);
-      if (sn->px.len == IP6_MAX_PREFIX_LENGTH)
+      lsab_put_prefix(p, &sn->prefix, sn->cost);
+      if (sn->prefix.pxlen == IP6_MAX_PREFIX_LENGTH)
 	host_addr = 1;
       i++;
     }
@@ -1450,11 +1455,14 @@ prepare_prefix_rt_lsa_body(struct ospf_proto *p, struct ospf_area *oa)
       struct ifa *a;
       WALK_LIST(a, ifa->iface->addrs)
       {
-	if ((a->flags & IA_SECONDARY) || (a->scope <= SCOPE_LINK))
+	if ((a->prefix.type != NET_IP6) ||
+	    (a->flags & IA_SECONDARY) ||
+	    (a->scope <= SCOPE_LINK))
 	  continue;
 
 	/* Found some IP */
-	lsab_put_prefix(p, a->ip, IP6_MAX_PREFIX_LENGTH, 0);
+	net_addr_ip6 net = NET_ADDR_IP6(a->ip, IP6_MAX_PREFIX_LENGTH);
+	lsab_put_prefix(p, (net_addr *) &net, 0);
 	i++;
 	goto done;
       }
diff --git a/proto/radv/config.Y b/proto/radv/config.Y
index da300667..efb474a6 100644
--- a/proto/radv/config.Y
+++ b/proto/radv/config.Y
@@ -53,9 +53,8 @@ radv_proto_item:
  | PREFIX radv_prefix { add_tail(&RADV_CFG->pref_list, NODE this_radv_prefix); }
  | RDNSS { init_list(&radv_dns_list); } radv_rdnss { add_tail_list(&RADV_CFG->rdnss_list, &radv_dns_list); }
  | DNSSL { init_list(&radv_dns_list); } radv_dnssl { add_tail_list(&RADV_CFG->dnssl_list, &radv_dns_list); }
- | TRIGGER prefix {
-     RADV_CFG->trigger_prefix = $2.addr;
-     RADV_CFG->trigger_pxlen = $2.len;
+ | TRIGGER net_any {
+     RADV_CFG->trigger = $2;
      RADV_CFG->trigger_valid = 1;
    }
  ;
@@ -148,11 +147,10 @@ radv_iface:
   radv_iface_start iface_patt_list_nopx radv_iface_opt_list radv_iface_finish;
 
 
-radv_prefix_start: prefix
+radv_prefix_start: net_ip6
 {
   this_radv_prefix = cfg_allocz(sizeof(struct radv_prefix_config));
-  RADV_PREFIX->prefix = $1.addr;
-  RADV_PREFIX->pxlen = $1.len;
+  RADV_PREFIX->prefix = $1.ip6;
 
   RADV_PREFIX->onlink = 1;
   RADV_PREFIX->autonomous = 1;
diff --git a/proto/radv/packets.c b/proto/radv/packets.c
index 3862af8d..a38b58b2 100644
--- a/proto/radv/packets.c
+++ b/proto/radv/packets.c
@@ -38,7 +38,7 @@ struct radv_opt_prefix
   u32 valid_lifetime;
   u32 preferred_lifetime;
   u32 reserved;
-  ip_addr prefix;
+  ip6_addr prefix;
 };
 
 #define OPT_PX_ONLINK 0x80
@@ -58,7 +58,7 @@ struct radv_opt_rdnss
   u8 length;
   u16 reserved;
   u32 lifetime;
-  ip_addr servers[];
+  ip6_addr servers[];
 };
 
 struct radv_opt_dnssl
@@ -90,11 +90,11 @@ radv_prefix_match(struct radv_iface *ifa, struct ifa *a)
     return NULL;
 
   WALK_LIST(pc, ifa->cf->pref_list)
-    if ((a->pxlen >= pc->pxlen) && ipa_in_net(a->prefix, pc->prefix, pc->pxlen))
+    if (net_in_netX(&a->prefix, (net_addr *) &pc->prefix))
       return pc;
 
   WALK_LIST(pc, cf->pref_list)
-    if ((a->pxlen >= pc->pxlen) && ipa_in_net(a->prefix, pc->prefix, pc->pxlen))
+    if (net_in_netX(&a->prefix, (net_addr *) &pc->prefix))
       return pc;
 
   return &default_prefix;
@@ -109,7 +109,7 @@ radv_prepare_rdnss(struct radv_iface *ifa, list *rdnss_list, char **buf, char *b
   {
     struct radv_rdnss_config *rcf_base = rcf;
     struct radv_opt_rdnss *op = (void *) *buf;
-    int max_i = (bufend - *buf - sizeof(struct radv_opt_rdnss)) / sizeof(ip_addr);
+    int max_i = (bufend - *buf - sizeof(struct radv_opt_rdnss)) / sizeof(ip6_addr);
     int i = 0;
 
     if (max_i < 1)
@@ -123,20 +123,19 @@ radv_prepare_rdnss(struct radv_iface *ifa, list *rdnss_list, char **buf, char *b
     else
       op->lifetime = htonl(rcf->lifetime);
 
-    while(NODE_VALID(rcf) && 
+    while(NODE_VALID(rcf) &&
 	  (rcf->lifetime == rcf_base->lifetime) &&
 	  (rcf->lifetime_mult == rcf_base->lifetime_mult))
       {
 	if (i >= max_i)
 	  goto too_much;
 
-	op->servers[i] = rcf->server;
-	ipa_hton(op->servers[i]);
+	op->servers[i] = ip6_hton(rcf->server);
 	i++;
 
 	rcf = NODE_NEXT(rcf);
       }
-  
+
     op->length = 1+2*i;
     *buf += 8 * op->length;
   }
@@ -273,6 +272,9 @@ radv_prepare_ra(struct radv_iface *ifa)
   struct ifa *addr;
   WALK_LIST(addr, ifa->iface->addrs)
   {
+    if (addr->prefix.type != NET_IP6)
+      continue;
+
     struct radv_prefix_config *pc;
     pc = radv_prefix_match(ifa, addr);
 
@@ -288,7 +290,7 @@ radv_prepare_ra(struct radv_iface *ifa)
     struct radv_opt_prefix *op = (void *) buf;
     op->type = OPT_PREFIX;
     op->length = 4;
-    op->pxlen = addr->pxlen;
+    op->pxlen = net6_pxlen(&addr->prefix);
     op->flags = (pc->onlink ? OPT_PX_ONLINK : 0) |
       (pc->autonomous ? OPT_PX_AUTONOMOUS : 0);
     op->valid_lifetime = (ra->active || !pc->valid_lifetime_sensitive) ?
@@ -296,8 +298,7 @@ radv_prepare_ra(struct radv_iface *ifa)
     op->preferred_lifetime = (ra->active || !pc->preferred_lifetime_sensitive) ?
       htonl(pc->preferred_lifetime) : 0;
     op->reserved = 0;
-    op->prefix = addr->prefix;
-    ipa_hton(op->prefix);
+    op->prefix = ip6_hton(net6_prefix(&addr->prefix));
     buf += sizeof(*op);
   }
 
diff --git a/proto/radv/radv.c b/proto/radv/radv.c
index 2de89991..97713b95 100644
--- a/proto/radv/radv.c
+++ b/proto/radv/radv.c
@@ -143,7 +143,7 @@ find_lladdr(struct iface *iface)
 {
   struct ifa *a;
   WALK_LIST(a, iface->addrs)
-    if (a->scope == SCOPE_LINK)
+    if ((a->prefix.type == NET_IP6) && (a->scope == SCOPE_LINK))
       return a;
 
   return NULL;
diff --git a/proto/radv/radv.h b/proto/radv/radv.h
index aede6a67..755009d4 100644
--- a/proto/radv/radv.h
+++ b/proto/radv/radv.h
@@ -82,8 +82,7 @@ struct radv_iface_config
 struct radv_prefix_config
 {
   node n;
-  ip_addr prefix;
-  int pxlen;
+  net_addr_ip6 prefix;
 
   u8 skip;			/* Do not include this prefix to RA */
   u8 onlink;			/* Standard options from RFC 4261 */
@@ -99,7 +98,7 @@ struct radv_rdnss_config
   node n;
   u32 lifetime;			/* Valid if lifetime_mult is 0 */
   u16 lifetime_mult;		/* Lifetime specified as multiple of max_ra_int */
-  ip_addr server;		/* IP address of recursive DNS server */
+  ip6_addr server;		/* IP address of recursive DNS server */
 };
 
 struct radv_dnssl_config
diff --git a/proto/static/config.Y b/proto/static/config.Y
index 182721b3..9e634803 100644
--- a/proto/static/config.Y
+++ b/proto/static/config.Y
@@ -52,11 +52,10 @@ static_proto:
  | static_proto stat_route stat_route_opt_list ';' { static_route_finish(); }
  ;
 
-stat_route0: ROUTE prefix {
+stat_route0: ROUTE net_any {
      this_srt = cfg_allocz(sizeof(struct static_route));
      add_tail(&STATIC_CFG->other_routes, &this_srt->n);
-     this_srt->net = $2.addr;
-     this_srt->masklen = $2.len;
+     this_srt->net = $2;
      this_srt_last_cmd = &(this_srt->cmds);
   }
  ;
@@ -72,7 +71,7 @@ stat_multipath1:
      this_srt_nh->use_bfd = -1; /* undefined */
    }
  | stat_multipath1 WEIGHT expr {
-     this_srt_nh->masklen = $3 - 1; /* really */
+     this_srt_nh->weight = $3 - 1;
      if (($3<1) || ($3>256)) cf_error("Weight must be in range 1-256"); 
    }
  | stat_multipath1 BFD bool {
diff --git a/proto/static/static.c b/proto/static/static.c
index a11a9b6e..bc5f104f 100644
--- a/proto/static/static.c
+++ b/proto/static/static.c
@@ -26,7 +26,7 @@
  * nodes (of dest RTD_NONE), which stores info about nexthops and are
  * connected to neighbor entries and neighbor notifications. Dummy
  * nodes are chained using mp_next, they aren't in other_routes list,
- * and abuse some fields (masklen, if_name) for other purposes.
+ * and abuse if_name field for other purposes.
  *
  * The only other thing worth mentioning is that when asked for reconfiguration,
  * Static not only compares the two configurations, but it also calculates
@@ -67,7 +67,7 @@ static_install(struct proto *p, struct static_route *r, struct iface *ifa)
   if (r->installed > 0)
     return;
 
-  DBG("Installing static route %I/%d, rtd=%d\n", r->net, r->masklen, r->dest);
+  DBG("Installing static route %N, rtd=%d\n", r->net, r->dest);
   bzero(&a, sizeof(a));
   a.src = p->main_source;
   a.source = (r->dest == RTD_DEVICE) ? RTS_STATIC_DEVICE : RTS_STATIC;
@@ -89,7 +89,7 @@ static_install(struct proto *p, struct static_route *r, struct iface *ifa)
 	    struct mpnh *nh = alloca(sizeof(struct mpnh));
 	    nh->gw = r2->via;
 	    nh->iface = r2->neigh->iface;
-	    nh->weight = r2->masklen; /* really */
+	    nh->weight = r2->weight;
 	    nh->next = NULL;
 	    *nhp = nh;
 	    nhp = &(nh->next);
@@ -112,7 +112,7 @@ static_install(struct proto *p, struct static_route *r, struct iface *ifa)
 
   /* We skip rta_lookup() here */
 
-  n = net_get_ipa(p->table, r->net, r->masklen);
+  n = net_get(p->table, r->net);
   e = rte_get_temp(&a);
   e->net = n;
   e->pflags = 0;
@@ -135,8 +135,8 @@ static_remove(struct proto *p, struct static_route *r)
   if (!r->installed)
     return;
 
-  DBG("Removing static route %I/%d via %I\n", r->net, r->masklen, r->via);
-  n = net_find_ipa(p->table, r->net, r->masklen);
+  DBG("Removing static route %N via %I\n", r->net, r->via);
+  n = net_find(p->table, r->net);
   rte_update(p, n, NULL);
   r->installed = 0;
 }
@@ -186,7 +186,7 @@ static_decide(struct static_config *cf, struct static_route *r)
 static void
 static_add(struct proto *p, struct static_config *cf, struct static_route *r)
 {
-  DBG("static_add(%I/%d,%d)\n", r->net, r->masklen, r->dest);
+  DBG("static_add(%N,%d)\n", r->net, r->dest);
   switch (r->dest)
     {
     case RTD_ROUTER:
@@ -388,7 +388,7 @@ static_bfd_notify(struct bfd_request *req)
 static void
 static_dump_rt(struct static_route *r)
 {
-  debug("%-1I/%2d: ", r->net, r->masklen);
+  debug("%-1N: ", r->net);
   switch (r->dest)
     {
     case RTD_ROUTER:
@@ -462,12 +462,6 @@ static_init(struct proto_config *c)
   return p;
 }
 
-static inline int
-static_same_net(struct static_route *x, struct static_route *y)
-{
-  return ipa_equal(x->net, y->net) && (x->masklen == y->masklen);
-}
-
 static inline int
 static_same_dest(struct static_route *x, struct static_route *y)
 {
@@ -486,7 +480,10 @@ static_same_dest(struct static_route *x, struct static_route *y)
       for (x = x->mp_next, y = y->mp_next;
 	   x && y;
 	   x = x->mp_next, y = y->mp_next)
-	if (!ipa_equal(x->via, y->via) || (x->via_if != y->via_if) || (x->use_bfd != y->use_bfd))
+	if (!ipa_equal(x->via, y->via) ||
+	    (x->via_if != y->via_if) ||
+	    (x->use_bfd != y->use_bfd) ||
+	    (x->weight != y->weight))
 	  return 0;
       return !x && !y;
 
@@ -521,11 +518,11 @@ static_match(struct proto *p, struct static_route *r, struct static_config *n)
     r->neigh->data = NULL;
 
   WALK_LIST(t, n->iface_routes)
-    if (static_same_net(r, t))
+    if (net_equal(r->net, t->net))
       goto found;
 
   WALK_LIST(t, n->other_routes)
-    if (static_same_net(r, t))
+    if (net_equal(r->net, t->net))
       goto found;
 
   static_remove(p, r);
@@ -659,13 +656,13 @@ static_show_rt(struct static_route *r)
     case RTDX_RECURSIVE: bsprintf(via, "recursive %I", r->via); break;
     default:		bsprintf(via, "???");
     }
-  cli_msg(-1009, "%I/%d %s%s%s", r->net, r->masklen, via,
+  cli_msg(-1009, "%N %s%s%s", r->net, via,
 	  r->bfd_req ? " (bfd)" : "", r->installed ? "" : " (dormant)");
 
   struct static_route *r2;
   if (r->dest == RTD_MULTIPATH)
     for (r2 = r->mp_next; r2; r2 = r2->mp_next)
-      cli_msg(-1009, "\tvia %I%J weight %d%s%s", r2->via, r2->via_if, r2->masklen + 1, /* really */
+      cli_msg(-1009, "\tvia %I%J weight %d%s%s", r2->via, r2->via_if, r2->weight + 1,
 	      r2->bfd_req ? " (bfd)" : "", r2->installed ? "" : " (dormant)");
 }
 
diff --git a/proto/static/static.h b/proto/static/static.h
index 6b047234..51486e83 100644
--- a/proto/static/static.h
+++ b/proto/static/static.h
@@ -26,8 +26,7 @@ void static_init_config(struct static_config *);
 struct static_route {
   node n;
   struct static_route *chain;		/* Next for the same neighbor */
-  ip_addr net;				/* Network we route */
-  int masklen;				/* Mask length */
+  net_addr *net;			/* Network we route */
   int dest;				/* Destination type (RTD_*) */
   ip_addr via;				/* Destination router */
   struct iface *via_if;			/* Destination iface, for link-local vias */
@@ -37,6 +36,7 @@ struct static_route {
   struct f_inst *cmds;			/* List of commands for setting attributes */
   int installed;			/* Installed in rt table, -1 for reinstall */
   int use_bfd;				/* Configured to use BFD */
+  int weight;				/* Multipath next hop weight */
   struct bfd_request *bfd_req;		/* BFD request, if BFD is used */
 };
 
diff --git a/sysdep/unix/krt.Y b/sysdep/unix/krt.Y
index e036081d..e769ec0f 100644
--- a/sysdep/unix/krt.Y
+++ b/sysdep/unix/krt.Y
@@ -67,11 +67,10 @@ kif_item:
       /* Scan time of 0 means scan on startup only */
       THIS_KIF->scan_time = $3;
    }
- | PRIMARY text_or_none prefix_or_ipa {
+ | PRIMARY opttext net_or_ipa {
      struct kif_primary_item *kpi = cfg_alloc(sizeof (struct kif_primary_item));
-     kpi->pattern = $2;
-     kpi->prefix = $3.addr;
-     kpi->pxlen = $3.len;
+     kpi->prefix = IPA_NONE; /* XXXX */
+     kpi->pxlen = 0; /* XXXX */
      add_tail(&THIS_KIF->primary, &kpi->n);
    }
  ;