diff --git a/avocado/utils/network/interfaces.py b/avocado/utils/network/interfaces.py
index d0263669bf..9fe26af770 100644
--- a/avocado/utils/network/interfaces.py
+++ b/avocado/utils/network/interfaces.py
@@ -821,12 +821,15 @@ def ping_flood(self, int_name, peer_ip, ping_count):
                   returns False on ping flood failure.
         :rtype: boolean
         """
-        cmd = f"ping -I {int_name} {peer_ip} -c {ping_count} -f "
+        cmd = f"ping -I {int_name} {peer_ip} -c {ping_count} -f"
+        if os.getuid() != 0:
+            cmd = f"{cmd} -i 0.002"
+        print(cmd)
         ping_process = subprocess.Popen(
             cmd,
             shell=True,
             stdout=subprocess.PIPE,
-            stderr=subprocess.STDOUT,
+            stderr=subprocess.PIPE,
             universal_newlines=True,
         )
         pattern = r"\.{10}"
@@ -835,8 +838,10 @@ def ping_flood(self, int_name, peer_ip, ping_count):
             match = re.search(pattern, char)
             if match:
                 ping_process.terminate()
-                msg = "ping flood failed to remote machine, Please check the logs"
-                LOG.debug(msg)
+                LOG.debug(
+                    "ping flood failed to remote machine, error output: %s",
+                    ping_process.stderr.read(),
+                )
                 return False
             return True
         ping_process.stdout.close()
diff --git a/selftests/check.py b/selftests/check.py
index d24009bd49..e345ec7f9b 100755
--- a/selftests/check.py
+++ b/selftests/check.py
@@ -29,7 +29,7 @@
     "nrunner-requirement": 28,
     "unit": 678,
     "jobs": 11,
-    "functional-parallel": 313,
+    "functional-parallel": 315,
     "functional-serial": 7,
     "optional-plugins": 0,
     "optional-plugins-golang": 2,
@@ -864,9 +864,10 @@ def main(args):  # pylint: disable=W0621
                     f" it has {suite.size}."
                 )
                 print(
-                    "If you made some changes into selftests please update `TEST_SIZE`"
-                    " variable in `check.py`. If you haven't done any changes to"
-                    " selftests this behavior is an ERROR, and it needs to be fixed."
+                    f"If you made some changes into selftests please update the "
+                    f"value for the `{suite.name}` key in the `TEST_SIZE` "
+                    f"dictionary in `check.py`. If you haven't done any changes to "
+                    f"selftests this behavior is an ERROR, and it needs to be fixed."
                 )
 
     # tmp dirs clean up check
diff --git a/selftests/functional/utils/network.py b/selftests/functional/utils/network.py
new file mode 100644
index 0000000000..9b9ed1ffdc
--- /dev/null
+++ b/selftests/functional/utils/network.py
@@ -0,0 +1,14 @@
+from avocado import Test
+from avocado.utils.network.hosts import LocalHost
+from avocado.utils.network.interfaces import NetworkInterface
+
+
+class Interface(Test):
+    def setUp(self):
+        self.interface = NetworkInterface("lo", LocalHost("lo"))
+
+    def test_ping_flood(self):
+        self.assertTrue(self.interface.ping_flood("lo", "127.0.0.1", "1"))
+
+    def test_ping_flood_fail(self):
+        self.assertFalse(self.interface.ping_flood("lo", "172.16.1.1", "100"))