1 files changed, 3 insertions, 1 deletions
diff --git a/src/op_mode/ping.py b/src/op_mode/ping.py
index 924a889db..2144ab53c 100755
--- a/src/op_mode/ping.py
+++ b/src/op_mode/ping.py
@@ -51,7 +51,7 @@ options = {
         'help': 'Number of seconds before ping exits'
     },
     'do-not-fragment': {
-        'ping': '{command} -M dont',
+        'ping': '{command} -M do',
         'type': 'noarg',
         'help': 'Set DF-bit flag to 1 for no fragmentation'
     },
@@ -220,6 +220,8 @@ if __name__ == '__main__':
 
     try:
         ip = socket.gethostbyname(host)
+    except UnicodeError:
+        sys.exit(f'ping: Unknown host: {host}')
     except socket.gaierror:
         ip = host