diff --git a/lib/netlink/constants.rb b/lib/netlink/constants.rb
index bb7fc16..0391c58 100644
--- a/lib/netlink/constants.rb
+++ b/lib/netlink/constants.rb
@@ -64,10 +64,6 @@ module Netlink
   NLA_ALIGNTO			= 4
   
   # from linux/rtnetlink.h.
-  # Should we put each of these groups under separate namespace?
-  #   Netlink::Message::GETROUTE
-  #   Netlink::Route::Type::UNICAST
-  #   Netlink::Route::Protocol::STATIC
   RTM_NEWLINK		= 16
   RTM_DELLINK		= 17
   RTM_GETLINK		= 18
@@ -123,7 +119,6 @@ module Netlink
   RTM_SETDCB		= 79
 
   # Route#type
-  
   RTN_UNSPEC		= 0
   RTN_UNICAST		= 1
   RTN_LOCAL		= 2
@@ -138,15 +133,42 @@ module Netlink
   RTN_XRESOLVE		= 11
   
   # Route#protocol
-  
   RTPROT_UNSPEC		= 0
   RTPROT_REDIRECT	= 1
   RTPROT_KERNEL		= 2
   RTPROT_BOOT		= 3
   RTPROT_STATIC		= 4
+  RTPROT_GATED		= 8
+  RTPROT_RA		= 9
+  RTPROT_MRT		= 10
+  RTPROT_ZEBRA		= 11
+  RTPROT_BIRD		= 12
+  RTPROT_DNROUTED	= 13
+  RTPROT_XORP		= 14
+  RTPROT_NTK		= 15
+  RTPROT_DHCP		= 16
   
-  # XXXX MORE TO GO
+  # Route#scope, Addr#scope
+  RT_SCOPE_UNIVERSE	= 0
+  RT_SCOPE_SITE		= 200
+  RT_SCOPE_LINK		= 253
+  RT_SCOPE_HOST		= 254
+  RT_SCOPE_NOWHERE	= 255
 
+  # Route#flags
+  RTM_F_NOTIFY		= 0x100
+  RTM_F_CLONED		= 0x200
+  RTM_F_EQUALIZE	= 0x400
+  RTM_F_PREFIX		= 0x800
+
+  # Route#table (reserved values)
+  RT_TABLE_UNSPEC	= 0
+  RT_TABLE_COMPAT	= 252
+  RT_TABLE_DEFAULT	= 253
+  RT_TABLE_MAIN		= 254
+  RT_TABLE_LOCAL	= 255
+  
+  # routing message attributes
   RTA_UNSPEC		= 0
   RTA_DST		= 1
   RTA_SRC		= 2
@@ -198,4 +220,56 @@ module Netlink
   IFA_ANYCAST		= 5
   IFA_CACHEINFO		= 6
   IFA_MULTICAST		= 7
+
+  IFA_F_SECONDARY	= 0x01
+  IFA_F_TEMPORARY	= IFA_F_SECONDARY
+  IFA_F_NODAD		= 0x02
+  IFA_F_OPTIMISTIC	= 0x04
+  IFA_F_DADFAILED	= 0x08
+  IFA_F_HOMEADDRESS	= 0x10
+  IFA_F_DEPRECATED	= 0x20
+  IFA_F_TENTATIVE	= 0x40
+  IFA_F_PERMANENT	= 0x80
+
+  # from linux/if_arp.h
+  ARPHRD_NETROM		= 0
+  ARPHRD_ETHER		= 1
+  ARPHRD_EETHER		= 2
+  ARPHRD_AX25		= 3
+  ARPHRD_PRONET		= 4
+  ARPHRD_CHAOS		= 5
+  ARPHRD_IEEE802	= 6
+  ARPHRD_ARCNET		= 7
+  ARPHRD_APPLETLK	= 8
+  ARPHRD_DLCI		= 15
+  ARPHRD_ATM		= 19
+  ARPHRD_METRICOM	= 23
+  ARPHRD_IEEE1394	= 24
+  ARPHRD_EUI64		= 27
+  ARPHRD_INFINIBAND	= 32
+  ARPHRD_LOOPBACK	= 772
+  # ... others to be added as required
+
+  # linux/if.h
+  IFF_UP		= 0x1
+  IFF_BROADCAST		= 0x2
+  IFF_DEBUG		= 0x4
+  IFF_LOOPBACK		= 0x8
+  IFF_POINTOPOINT	= 0x10
+  IFF_NOTRAILERS	= 0x20
+  IFF_RUNNING		= 0x40
+  IFF_NOARP		= 0x80
+  IFF_PROMISC		= 0x100
+  IFF_ALLMULTI		= 0x200
+  IFF_MASTER		= 0x400
+  IFF_SLAVE		= 0x800
+  IFF_MULTICAST		= 0x1000
+  IFF_PORTSEL		= 0x2000
+  IFF_AUTOMEDIA		= 0x4000
+  IFF_DYNAMIC		= 0x8000
+  IFF_LOWER_UP		= 0x10000
+  IFF_DORMANT		= 0x20000
+  IFF_ECHO		= 0x40000
+  IFF_VOLATILE		= (IFF_LOOPBACK|IFF_POINTOPOINT|IFF_BROADCAST|IFF_ECHO|\
+			IFF_MASTER|IFF_SLAVE|IFF_RUNNING|IFF_LOWER_UP|IFF_DORMANT)
 end
diff --git a/lib/netlink/message.rb b/lib/netlink/message.rb
index 5957481..a34a460 100644
--- a/lib/netlink/message.rb
+++ b/lib/netlink/message.rb
@@ -226,12 +226,12 @@ module Netlink
 
   class Link < RtattrMessage
     code RTM_NEWLINK, RTM_DELLINK, RTM_GETLINK
-    field :family, :uchar
+    field :family, :uchar			# Socket::AF_*
     field :pad, :uchar
-    field :type, :ushort
+    field :type, :ushort			# ARPHRD_*
     field :index, :int
-    field :flags, :uint
-    field :change, :uint
+    field :flags, :uint				# IFF_*
+    field :change, :uint, :default=>0xffffffff
     rtattr :address, IFLA_ADDRESS
     rtattr :broadcast, IFLA_BROADCAST
     rtattr :ifname, IFLA_IFNAME, :cstring
@@ -260,10 +260,10 @@ module Netlink
 
   class Addr < RtattrMessage
     code RTM_NEWADDR, RTM_DELADDR, RTM_GETADDR
-    field :family, :uchar
+    field :family, :uchar			# Socket::AF_*
     field :prefixlen, :uchar
-    field :flags, :uchar
-    field :scope, :uchar
+    field :flags, :uchar			# IFA_F_*
+    field :scope, :uchar			# RT_SCOPE_*
     field :index, :int
     rtattr :address, IFA_ADDRESS, :l3addr
     rtattr :local, IFA_LOCAL, :l3addr
@@ -276,15 +276,15 @@ module Netlink
 
   class Route < RtattrMessage
     code RTM_NEWROUTE, RTM_DELROUTE, RTM_GETROUTE
-    field :family, :uchar
+    field :family, :uchar			# Socket::AF_*
     field :dst_len, :uchar
     field :src_len, :uchar
     field :tos, :uchar
-    field :table, :uchar
-    field :protocol, :uchar
-    field :scope, :uchar
-    field :type, :uchar
-    field :flags, :uint
+    field :table, :uchar			# table id or RT_TABLE_*
+    field :protocol, :uchar			# RTPROT_*
+    field :scope, :uchar			# RT_SCOPE_*
+    field :type, :uchar				# RTN_*
+    field :flags, :uint				# RTM_F_*
     rtattr :dst, RTA_DST, :l3addr
     rtattr :src, RTA_SRC, :l3addr
     rtattr :iif, RTA_IIF, :uint32
diff --git a/lib/netlink/rtsocket.rb b/lib/netlink/rtsocket.rb
index 4acb337..598e0b2 100644
--- a/lib/netlink/rtsocket.rb
+++ b/lib/netlink/rtsocket.rb
@@ -93,8 +93,10 @@ if __FILE__ == $0
   addrs = nl.addrs_by_index(:family=>Socket::AF_UNSPEC)
   routes = nl.routes_by_oif(:family=>Socket::AF_UNSPEC)
   links.each do |link|
+    #p link
     puts "#{link.ifname}"
     addrs[link.index].each do |addr|
+      #p addr
       puts "  family=#{addr.family} #{addr.address}/#{addr.prefixlen} label=#{addr.label}"
     end
     routes[link.index].each do |route|