diff --git a/src/devices/wifi/dcf-manager.cc b/src/devices/wifi/dcf-manager.cc
index 7b71217b8..ec2b0e1fc 100644
--- a/src/devices/wifi/dcf-manager.cc
+++ b/src/devices/wifi/dcf-manager.cc
@@ -577,7 +577,7 @@ DcfManager::NotifyTxStartNow (Time duration)
     //this may be caused only if PHY has started to receive a packet
     //inside SIFS, so, we check that lastRxStart was maximum a SIFS
     //ago
-    NS_ASSERT(Simulator::Now () - m_lastRxStart < m_sifs);
+    NS_ASSERT(Simulator::Now () - m_lastRxStart <= m_sifs);
     m_lastRxEnd = Simulator::Now ();
     m_lastRxDuration = m_lastRxEnd - m_lastRxStart;
     m_lastRxReceivedOk = true;
diff --git a/src/internet-stack/ipv4-interface.cc b/src/internet-stack/ipv4-interface.cc
index ac841e96c..3d1779fce 100644
--- a/src/internet-stack/ipv4-interface.cc
+++ b/src/internet-stack/ipv4-interface.cc
@@ -43,7 +43,7 @@ Ipv4Interface::GetTypeId (void)
                    "The arp cache for this ipv4 interface",
                    PointerValue (0),
                    MakePointerAccessor (&Ipv4Interface::m_cache),
-                   MakePointerChecker<Ipv4Interface> ())
+                   MakePointerChecker<ArpCache> ())
     ;
     ;
   return tid;
diff --git a/src/node/udp-socket.cc b/src/node/udp-socket.cc
index c9f370662..9f399a346 100644
--- a/src/node/udp-socket.cc
+++ b/src/node/udp-socket.cc
@@ -58,13 +58,13 @@ UdpSocket::GetTypeId (void)
     .AddAttribute ("IpMulticastIf",
                    "interface index for outgoing multicast on this socket; -1 indicates to use default interface",
                    IntegerValue (-1),
-                   MakeUintegerAccessor (&UdpSocket::GetIpMulticastTtl,
-                                         &UdpSocket::SetIpMulticastTtl),
+                   MakeIntegerAccessor (&UdpSocket::GetIpMulticastIf,
+                                         &UdpSocket::SetIpMulticastIf),
                    MakeIntegerChecker<int32_t> ())
     .AddAttribute ("IpMulticastLoop",
                    "whether outgoing multicast sent also to loopback interface",
                    BooleanValue (false),
-                   MakeUintegerAccessor (&UdpSocket::GetIpMulticastLoop,
+                   MakeBooleanAccessor (&UdpSocket::GetIpMulticastLoop,
                                          &UdpSocket::SetIpMulticastLoop),
                    MakeBooleanChecker ())
     .AddAttribute ("MtuDiscover", "If enabled, every outgoing ip packet will have the DF flag set.",