diff -r a3c5fea29467 src/network/examples/ipv4-address-vector-example.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/network/examples/ipv4-address-vector-example.cc	Fri Mar 25 14:24:23 2016 -0700
@@ -0,0 +1,127 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2016 University of Washington
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Author: Tom Henderson <tomhend@u.washington.edu>
+ */
+
+//
+// Simple example showing how to add a vector of Ipv4Address instances to an
+// attribute
+//
+
+#include "ns3/object.h"
+#include "ns3/string.h"
+#include "ns3/config.h"
+#include "ns3/address-utils.h"
+
+using namespace ns3;
+
+class SampleIpv4AddressVectorClass : public Object
+{
+public:
+  static TypeId GetTypeId (void);
+  virtual TypeId GetInstanceTypeId (void) const;
+
+  void Print (std::ostream &os) const;
+
+private:
+  static Ipv4AddressVector GetDefault (void);
+  Ipv4AddressVector m_vector;
+  Ipv4AddressVector m_vector2;
+};
+
+TypeId 
+SampleIpv4AddressVectorClass::GetTypeId (void)
+{
+  static TypeId tid = TypeId ("ns3::SampleIpv4AddressVectorClass")
+    .SetParent<Object> ()
+    .AddConstructor<SampleIpv4AddressVectorClass> ()
+    .AddAttribute ("Ipv4Addresses",
+                   "Ipv4 addresses",
+                   Ipv4AddressVectorValue (SampleIpv4AddressVectorClass::GetDefault ()),
+                   MakeIpv4AddressVectorAccessor (&SampleIpv4AddressVectorClass::m_vector),
+                   MakeIpv4AddressVectorChecker ())
+    // Another way to configure the default value is with a StringValue
+    .AddAttribute ("Ipv4Addresses2",
+                   "Ipv4 addresses",
+                   StringValue ("127.0.0.1,127.0.1.1"),
+                   MakeIpv4AddressVectorAccessor (&SampleIpv4AddressVectorClass::m_vector2),
+                   MakeIpv4AddressVectorChecker ())
+  ;
+  return tid;
+}
+
+TypeId 
+SampleIpv4AddressVectorClass::GetInstanceTypeId (void) const
+{
+  return GetTypeId ();
+}
+
+void 
+SampleIpv4AddressVectorClass::Print (std::ostream &os) const
+{
+  for (std::vector<Ipv4Address>::const_iterator it = m_vector.begin (); 
+       it != m_vector.end (); )
+    {
+      it->Print (os);
+      if (++it != m_vector.end ())
+        {
+          os << ",";
+        }
+      else
+        {
+          break;
+        }
+    }
+}
+
+Ipv4AddressVector
+SampleIpv4AddressVectorClass::GetDefault (void)
+{
+  Ipv4AddressVector v;
+  v.push_back (Ipv4Address ("0.0.0.0"));
+  return v;
+}
+
+int main (int argc, char *argv[])
+{
+  Ptr<SampleIpv4AddressVectorClass> t = CreateObject<SampleIpv4AddressVectorClass> ();
+
+  // Print out default 
+  t->Print (std::cout); 
+  std::cout << std::endl;
+
+  Config::SetDefault ("ns3::SampleIpv4AddressVectorClass::Ipv4Addresses", StringValue ("10.0.0.1,10.0.0.2"));
+
+  Ptr<SampleIpv4AddressVectorClass> t2 = CreateObject<SampleIpv4AddressVectorClass> ();
+  // Print out new default
+  t2->Print (std::cout);
+  std::cout << std::endl;
+
+  // Modify the attribute value
+  Ipv4AddressVector v;
+  v.push_back (Ipv4Address ("192.168.0.1"));
+  v.push_back (Ipv4Address ("192.168.1.1"));
+  v.push_back (Ipv4Address ("192.168.2.1"));
+  t->SetAttribute ("Ipv4Addresses", Ipv4AddressVectorValue (v));
+
+  // Print out modified
+  t->Print (std::cout); 
+  std::cout << std::endl;
+
+  return 0;
+}
diff -r a3c5fea29467 src/network/examples/wscript
--- a/src/network/examples/wscript	Thu Mar 24 20:54:02 2016 +0100
+++ b/src/network/examples/wscript	Fri Mar 25 14:24:23 2016 -0700
@@ -10,5 +10,8 @@
     obj = bld.create_ns3_program('main-packet-tag', ['network'])
     obj.source = 'main-packet-tag.cc'
 
+    obj = bld.create_ns3_program('ipv4-address-vector-example', ['network'])
+    obj.source = 'ipv4-address-vector-example.cc'
+
     obj = bld.create_ns3_program('packet-socket-apps', ['core', 'network'])
     obj.source = 'packet-socket-apps.cc'
diff -r a3c5fea29467 src/network/utils/address-utils.cc
--- a/src/network/utils/address-utils.cc	Thu Mar 24 20:54:02 2016 +0100
+++ b/src/network/utils/address-utils.cc	Fri Mar 25 14:24:23 2016 -0700
@@ -126,4 +126,50 @@
 
 } // namespace addressUtils
 
+ATTRIBUTE_HELPER_CPP (Ipv4AddressVector);
+
+std::ostream &
+operator << (std::ostream &os, const Ipv4AddressVector &ipv4AddressVector)
+{
+  for (uint32_t i = 0; i < ipv4AddressVector.size (); i++)
+    {
+      os << ipv4AddressVector[i];
+      if (i < (ipv4AddressVector.size () - 1))
+        {
+          os << ",";
+        }
+    }
+  return os;
+}
+
+std::istream &
+operator >> (std::istream &is, Ipv4AddressVector &ipv4AddressVector)
+{
+  char delim = ',';
+  std::string addressStr;
+  is >> addressStr;
+  std::vector<std::string> addrs;
+
+  // parse input stream for addresses
+  for (size_t p=0, q=0; p != addressStr.npos; p = q)
+    {
+      addrs.push_back (addressStr.substr (p + (p != 0), (q = addressStr.find (delim, p+1)) - p - (p != 0)));
+    }
+  if (addrs.size () > 0)
+    {
+      ipv4AddressVector.clear ();
+      ipv4AddressVector.resize (addrs.size ());
+      for (uint32_t i = 0; i < addrs.size (); i++)
+        {
+          ipv4AddressVector[i] = Ipv4Address (addrs[i].c_str ());
+        }
+    }
+  else
+    {
+      is.setstate (std::ios_base::failbit);
+    }
+  
+  return is;
+}
+
 } // namespace ns3
diff -r a3c5fea29467 src/network/utils/address-utils.h
--- a/src/network/utils/address-utils.h	Thu Mar 24 20:54:02 2016 +0100
+++ b/src/network/utils/address-utils.h	Fri Mar 25 14:24:23 2016 -0700
@@ -124,6 +124,11 @@
 bool IsMulticast (const Address &ad);
 };
 
+typedef std::vector<Ipv4Address> Ipv4AddressVector;
+std::ostream &operator << (std::ostream &os, const Ipv4AddressVector &ipv4AddressVector);
+std::istream &operator >> (std::istream &is, Ipv4AddressVector &ipv4AddressVector);
+ATTRIBUTE_HELPER_HEADER (Ipv4AddressVector);
+
 };
 
 #endif /* ADDRESS_UTILS_H */