diff --git a/src/internet/model/ipv4-end-point-demux.cc b/src/internet/model/ipv4-end-point-demux.cc
index 068cac349..058e1569b 100644
--- a/src/internet/model/ipv4-end-point-demux.cc
+++ b/src/internet/model/ipv4-end-point-demux.cc
@@ -30,9 +30,9 @@ namespace ns3
 NS_LOG_COMPONENT_DEFINE("Ipv4EndPointDemux");
 
 Ipv4EndPointDemux::Ipv4EndPointDemux()
-    : m_ephemeral(1024),
+    : m_ephemeral(49152),
       m_portLast(65535),
-      m_portFirst(1024)
+      m_portFirst(49152)
 {
     NS_LOG_FUNCTION(this);
 }
diff --git a/src/internet/model/ipv6-end-point-demux.cc b/src/internet/model/ipv6-end-point-demux.cc
index 3bc18fdf6..94a3944fa 100644
--- a/src/internet/model/ipv6-end-point-demux.cc
+++ b/src/internet/model/ipv6-end-point-demux.cc
@@ -29,8 +29,8 @@ namespace ns3
 NS_LOG_COMPONENT_DEFINE("Ipv6EndPointDemux");
 
 Ipv6EndPointDemux::Ipv6EndPointDemux()
-    : m_ephemeral(1024),
-      m_portFirst(1024),
+    : m_ephemeral(49152),
+      m_portFirst(49152),
       m_portLast(65535)
 {
     NS_LOG_FUNCTION(this);