diff --git a/tests/daemon/face/udp-factory.t.cpp b/tests/daemon/face/udp-factory.t.cpp
index 0bf7e03..e2788f5 100644
--- a/tests/daemon/face/udp-factory.t.cpp
+++ b/tests/daemon/face/udp-factory.t.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2020,  Regents of the University of California,
+ * Copyright (c) 2014-2021,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -195,9 +195,10 @@
   parseConfig(CONFIG, false);
 
   checkChannelListEqual(factory, {"udp4://0.0.0.0:6363", "udp6://[::]:6363"});
-  auto channels = factory.getChannels();
-  BOOST_CHECK(std::all_of(channels.begin(), channels.end(),
-                          [] (const auto& ch) { return ch->isListening(); }));
+  for (const auto& ch : factory.getChannels()) {
+    BOOST_CHECK(ch->isListening());
+    BOOST_CHECK_EQUAL(ch->getDefaultMtu(), ndn::MAX_NDN_PACKET_SIZE);
+  }
 }
 
 BOOST_AUTO_TEST_CASE(DisableListen)
@@ -218,9 +219,9 @@
   parseConfig(CONFIG, false);
 
   checkChannelListEqual(factory, {"udp4://0.0.0.0:7001", "udp6://[::]:7001"});
-  auto channels = factory.getChannels();
-  BOOST_CHECK(std::none_of(channels.begin(), channels.end(),
-                           [] (const auto& ch) { return ch->isListening(); }));
+  for (const auto& ch : factory.getChannels()) {
+    BOOST_CHECK(!ch->isListening());
+  }
 }
 
 BOOST_AUTO_TEST_CASE(DisableV4)
@@ -233,6 +234,7 @@
         port 7001
         enable_v4 no
         enable_v6 yes
+        unicast_mtu 1452
         mcast no
       }
     }
@@ -242,6 +244,9 @@
   parseConfig(CONFIG, false);
 
   checkChannelListEqual(factory, {"udp6://[::]:7001"});
+  for (const auto& ch : factory.getChannels()) {
+    BOOST_CHECK_EQUAL(ch->getDefaultMtu(), 1452);
+  }
 }
 
 BOOST_AUTO_TEST_CASE(DisableV6)
@@ -254,6 +259,7 @@
         port 7001
         enable_v4 yes
         enable_v6 no
+        unicast_mtu 1452
         mcast no
       }
     }
@@ -263,6 +269,9 @@
   parseConfig(CONFIG, false);
 
   checkChannelListEqual(factory, {"udp4://0.0.0.0:7001"});
+  for (const auto& ch : factory.getChannels()) {
+    BOOST_CHECK_EQUAL(ch->getDefaultMtu(), 1452);
+  }
 }
 
 BOOST_FIXTURE_TEST_CASE(EnableDisableMcast, UdpFactoryMcastFixture)
@@ -666,6 +675,51 @@
   BOOST_CHECK_THROW(parseConfig(CONFIG2, false), ConfigFile::Error);
 }
 
+BOOST_AUTO_TEST_CASE(BadMtu)
+{
+  // not a number
+  const std::string CONFIG1 = R"CONFIG(
+    face_system
+    {
+      udp
+      {
+        unicast_mtu hello
+      }
+    }
+  )CONFIG";
+
+  BOOST_CHECK_THROW(parseConfig(CONFIG1, true), ConfigFile::Error);
+  BOOST_CHECK_THROW(parseConfig(CONFIG1, false), ConfigFile::Error);
+
+  // underflow
+  const std::string CONFIG2 = R"CONFIG(
+    face_system
+    {
+      udp
+      {
+        unicast_mtu 63
+      }
+    }
+  )CONFIG";
+
+  BOOST_CHECK_THROW(parseConfig(CONFIG2, true), ConfigFile::Error);
+  BOOST_CHECK_THROW(parseConfig(CONFIG2, false), ConfigFile::Error);
+
+  // underflow
+  const std::string CONFIG3 = R"CONFIG(
+    face_system
+    {
+      udp
+      {
+        unicast_mtu 8801
+      }
+    }
+  )CONFIG";
+
+  BOOST_CHECK_THROW(parseConfig(CONFIG3, true), ConfigFile::Error);
+  BOOST_CHECK_THROW(parseConfig(CONFIG3, false), ConfigFile::Error);
+}
+
 BOOST_AUTO_TEST_CASE(BadMcast)
 {
   const std::string CONFIG = R"CONFIG(